configure.ac

   1 dnl Process this file with autoconf to produce a configure script.
   2 dnl Note we do not use AC_PREREQ here!  See aclocal.m4 for what we use instead.
   3 AC_INIT([GNU C Library], [(see version.h)], [http://sourceware.org/bugzilla/], [glibc])
   4 AC_CONFIG_SRCDIR([include/features.h])
   5 AC_CONFIG_HEADERS([config.h])
   6 AC_CONFIG_AUX_DIR([scripts])
   7
   8 ACX_PKGVERSION([GNU libc])
   9 ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html])
  10 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
  11                    [Package description])
  12 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
  13                    [Bug reporting address])
  14
  15 # Glibc should not depend on any header files
  16 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
  17   [m4_divert_text([DEFAULTS],
  18     [ac_includes_default='/* none */'])])
  19
  20 # We require GCC, and by default use its preprocessor.  Override AC_PROG_CPP
  21 # here to work around the Autoconf issue discussed in
  22 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
  23 AC_DEFUN([AC_PROG_CPP],
  24 [AC_REQUIRE([AC_PROG_CC])dnl
  25 AC_ARG_VAR([CPP],      [C preprocessor])dnl
  26 _AC_ARG_VAR_CPPFLAGS()dnl
  27 # On Suns, sometimes $CPP names a directory.
  28 if test -n "$CPP" && test -d "$CPP"; then
  29   CPP=
  30 fi
  31 if test -z "$CPP"; then
  32   CPP="$CC -E"
  33 fi
  34 AC_SUBST(CPP)dnl
  35 ])# AC_PROG_CPP
  36
  37 # We require GCC.  Override _AC_PROG_CC_C89 here to work around the Autoconf
  38 # issue discussed in
  39 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
  40 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
  41
  42 dnl This is here so we can set $subdirs directly based on configure fragments.
  43 AC_CONFIG_SUBDIRS()
  44
  45 AC_CANONICAL_HOST
  46
  47 AC_PROG_CC
  48 if test $host != $build; then
  49   AC_CHECK_PROGS(BUILD_CC, gcc cc)
  50 fi
  51 AC_SUBST(cross_compiling)
  52 AC_PROG_CPP
  53 # We need the C++ compiler only for testing.
  54 AC_PROG_CXX
  55 AC_CHECK_TOOL(READELF, readelf, false)
  56
  57 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
  58   AC_MSG_ERROR([you must configure in a separate build directory])
  59 fi
  60
  61 # This will get text that should go into config.make.
  62 config_vars=
  63
  64 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  65 AC_ARG_WITH([gd],
  66             AC_HELP_STRING([--with-gd=DIR],
  67                            [find libgd include dir and library with prefix DIR]),
  68             [dnl
  69 case "$with_gd" in
  70 yes|''|no) ;;
  71 *) libgd_include="-I$withval/include"
  72    libgd_ldflags="-L$withval/lib" ;;
  73 esac
  74 ])
  75 AC_ARG_WITH([gd-include],
  76             AC_HELP_STRING([--with-gd-include=DIR],
  77                            [find libgd include files in DIR]),
  78             [dnl
  79 case "$with_gd_include" in
  80 ''|no) ;;
  81 *) libgd_include="-I$withval" ;;
  82 esac
  83 ])
  84 AC_ARG_WITH([gd-lib],
  85             AC_HELP_STRING([--with-gd-lib=DIR],
  86                            [find libgd library files in DIR]),
  87             [dnl
  88 case "$with_gd_lib" in
  89 ''|no) ;;
  90 *) libgd_ldflags="-L$withval" ;;
  91 esac
  92 ])
  93
  94 if test -n "$libgd_include"; then
  95   config_vars="$config_vars
  96 CFLAGS-memusagestat.c = $libgd_include"
  97 fi
  98 if test -n "$libgd_ldflags"; then
  99   config_vars="$config_vars
 100 libgd-LDFLAGS = $libgd_ldflags"
 101 fi
 102
 103 dnl Arguments to specify presence of other packages/features.
 104 AC_ARG_WITH([fp],
 105             AC_HELP_STRING([--with-fp],
 106                            [if using floating-point hardware @<:@default=yes@:>@]),
 107             [with_fp=$withval],
 108             [with_fp=yes])
 109 AC_SUBST(with_fp)
 110 AC_ARG_WITH([binutils],
 111             AC_HELP_STRING([--with-binutils=PATH],
 112                            [specify location of binutils (as and ld)]),
 113             [path_binutils=$withval],
 114             [path_binutils=''])
 115 AC_ARG_WITH([selinux],
 116             AC_HELP_STRING([--with-selinux],
 117                            [if building with SELinux support]),
 118             [with_selinux=$withval],
 119             [with_selinux=auto])
 120
 121 AC_ARG_WITH([headers],
 122             AC_HELP_STRING([--with-headers=PATH],
 123                            [location of system headers to use
 124                             (for example /usr/src/linux/include)
 125                             @<:@default=compiler default@:>@]),
 126             [sysheaders=$withval],
 127             [sysheaders=''])
 128 AC_SUBST(sysheaders)
 129
 130 AC_SUBST(use_default_link)
 131 AC_ARG_WITH([default-link],
 132             AC_HELP_STRING([--with-default-link],
 133                            [do not use explicit linker scripts]),
 134             [use_default_link=$withval],
 135             [use_default_link=default])
 136
 137 AC_ARG_ENABLE([sanity-checks],
 138               AC_HELP_STRING([--disable-sanity-checks],
 139                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 140               [enable_sanity=$enableval],
 141               [enable_sanity=yes])
 142
 143 AC_ARG_ENABLE([shared],
 144               AC_HELP_STRING([--enable-shared],
 145                              [build shared library @<:@default=yes if GNU ld@:>@]),
 146               [shared=$enableval],
 147               [shared=yes])
 148 AC_ARG_ENABLE([profile],
 149               AC_HELP_STRING([--enable-profile],
 150                              [build profiled library @<:@default=no@:>@]),
 151               [profile=$enableval],
 152               [profile=no])
 153
 154 AC_ARG_ENABLE([hardcoded-path-in-tests],
 155               AC_HELP_STRING([--enable-hardcoded-path-in-tests],
 156                              [hardcode newly built glibc path in tests @<:@default=no@:>@]),
 157               [hardcoded_path_in_tests=$enableval],
 158               [hardcoded_path_in_tests=no])
 159 AC_SUBST(hardcoded_path_in_tests)
 160
 161 AC_ARG_ENABLE([stackguard-randomization],
 162               AC_HELP_STRING([--enable-stackguard-randomization],
 163                              [initialize __stack_chk_guard canary with a random number at program start]),
 164               [enable_stackguard_randomize=$enableval],
 165               [enable_stackguard_randomize=no])
 166 if test "$enable_stackguard_randomize" = yes; then
 167   AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
 168 fi
 169
 170 AC_ARG_ENABLE([lock-elision],
 171               AC_HELP_STRING([--enable-lock-elision[=yes/no]],
 172                              [Enable lock elision for pthread mutexes by default]),
 173               [enable_lock_elision=$enableval],
 174               [enable_lock_elision=no])
 175 AC_SUBST(enable_lock_elision)
 176 if test "$enable_lock_elision" = yes ; then
 177   AC_DEFINE(ENABLE_LOCK_ELISION)
 178 fi
 179
 180 dnl Generic infrastructure for drop-in additions to libc.
 181 AC_ARG_ENABLE([add-ons],
 182               AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
 183                              [configure and build add-ons in DIR1,DIR2,...
 184                               search for add-ons if no parameter given]),
 185                              , [enable_add_ons=yes])
 186
 187 AC_ARG_ENABLE([hidden-plt],
 188               AC_HELP_STRING([--disable-hidden-plt],
 189                              [do not hide internal function calls to avoid PLT]),
 190               [hidden=$enableval],
 191               [hidden=yes])
 192 if test "x$hidden" = xno; then
 193   AC_DEFINE(NO_HIDDEN)
 194 fi
 195
 196 AC_ARG_ENABLE([bind-now],
 197               AC_HELP_STRING([--enable-bind-now],
 198                              [disable lazy relocations in DSOs]),
 199               [bindnow=$enableval],
 200               [bindnow=no])
 201 AC_SUBST(bindnow)
 202
 203 dnl On some platforms we cannot use dynamic loading.  We must provide
 204 dnl static NSS modules.
 205 AC_ARG_ENABLE([static-nss],
 206               AC_HELP_STRING([--enable-static-nss],
 207                              [build static NSS modules @<:@default=no@:>@]),
 208               [static_nss=$enableval],
 209               [static_nss=no])
 210 dnl Enable static NSS also if we build no shared objects.
 211 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 212   static_nss=yes
 213   AC_DEFINE(DO_STATIC_NSS)
 214 fi
 215
 216 AC_ARG_ENABLE([force-install],
 217               AC_HELP_STRING([--disable-force-install],
 218                              [don't force installation of files from this package, even if they are older than the installed files]),
 219               [force_install=$enableval],
 220               [force_install=yes])
 221 AC_SUBST(force_install)
 222
 223 AC_ARG_ENABLE([maintainer-mode],
 224               AC_HELP_STRING([--enable-maintainer-mode],
 225                              [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
 226               [maintainer=$enableval],
 227               [maintainer=no])
 228
 229 dnl On some platforms we allow dropping compatibility with all kernel
 230 dnl versions.
 231 AC_ARG_ENABLE([kernel],
 232               AC_HELP_STRING([--enable-kernel=VERSION],
 233                              [compile for compatibility with kernel not older than VERSION]),
 234               [minimum_kernel=$enableval],
 235               [])
 236 dnl Prevent unreasonable values.
 237 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 238   # Better nothing than this.
 239   minimum_kernel=""
 240 else
 241   if test "$minimum_kernel" = current; then
 242     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 243   fi
 244 fi
 245
 246 dnl For the development we sometimes want gcc to issue even more warnings.
 247 dnl This is not the default since many of the extra warnings are not
 248 dnl appropriate.
 249 AC_ARG_ENABLE([all-warnings],
 250               AC_HELP_STRING([--enable-all-warnings],
 251                              [enable all useful warnings gcc can issue]),
 252               [all_warnings=$enableval],
 253               [])
 254 AC_SUBST(all_warnings)
 255
 256 AC_ARG_ENABLE([werror],
 257               AC_HELP_STRING([--disable-werror],
 258                              [do not build with -Werror]),
 259               [enable_werror=$enableval],
 260               [enable_werror=yes])
 261 AC_SUBST(enable_werror)
 262
 263 AC_ARG_ENABLE([multi-arch],
 264               AC_HELP_STRING([--enable-multi-arch],
 265                              [enable single DSO with optimizations for multiple architectures]),
 266               [multi_arch=$enableval],
 267               [multi_arch=default])
 268
 269 AC_ARG_ENABLE([nss-crypt],
 270               AC_HELP_STRING([--enable-nss-crypt],
 271                              [enable libcrypt to use nss]),
 272               [nss_crypt=$enableval],
 273               [nss_crypt=no])
 274 if test x$nss_crypt = xyes; then
 275   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 276   if test $? -ne 0; then
 277     AC_MSG_ERROR([cannot find include directory with nss-config])
 278   fi
 279   old_CFLAGS="$CFLAGS"
 280   CFLAGS="$CFLAGS $nss_includes"
 281   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 282 #include <hasht.h>
 283 #include <nsslowhash.h>
 284 void f (void) { NSSLOW_Init (); }])],
 285              libc_cv_nss_crypt=yes,
 286              AC_MSG_ERROR([
 287 cannot find NSS headers with lowlevel hash function interfaces]))
 288   old_LIBS="$LIBS"
 289   LIBS="$LIBS -lfreebl3"
 290   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 291 #include <hasht.h>
 292 #include <nsslowhash.h>],
 293                                   [NSSLOW_Init();])],
 294                  libc_cv_nss_crypt=yes,
 295                  AC_MSG_ERROR([
 296 cannot link program using lowlevel NSS hash functions]))
 297   CFLAGS="$old_CFLAGS"
 298   LIBS="$old_LIBS"
 299 else
 300   libc_cv_nss_crypt=no
 301 fi
 302 AC_SUBST(libc_cv_nss_crypt)
 303
 304
 305 AC_ARG_ENABLE([obsolete-rpc],
 306               AC_HELP_STRING([--enable-obsolete-rpc],
 307                              [build and install the obsolete RPC code for link-time usage]),
 308               [link_obsolete_rpc=$enableval],
 309               [link_obsolete_rpc=no])
 310 AC_SUBST(link_obsolete_rpc)
 311
 312 if test "$link_obsolete_rpc" = yes; then
 313   AC_DEFINE(LINK_OBSOLETE_RPC)
 314 fi
 315
 316 AC_ARG_ENABLE([systemtap],
 317               [AS_HELP_STRING([--enable-systemtap],
 318                [enable systemtap static probe points @<:@default=no@:>@])],
 319               [systemtap=$enableval],
 320               [systemtap=no])
 321 if test "x$systemtap" != xno; then
 322   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 323   old_CFLAGS="$CFLAGS"
 324   CFLAGS="-std=gnu99 $CFLAGS"
 325   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 326 void foo (int i, void *p)
 327 {
 328   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 329        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 330 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 331   CFLAGS="$old_CFLAGS"])
 332   if test $libc_cv_sdt = yes; then
 333     AC_DEFINE([USE_STAP_PROBE])
 334   elif test "x$systemtap" != xauto; then
 335     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 336   fi
 337 fi
 338
 339 AC_ARG_ENABLE([build-nscd],
 340               [AS_HELP_STRING([--disable-build-nscd],
 341                [disable building and installing the nscd daemon])],
 342               [build_nscd=$enableval],
 343               [build_nscd=default])
 344 AC_SUBST(build_nscd)
 345
 346 # Note the use of $use_nscd is near the bottom of the file.
 347 AC_ARG_ENABLE([nscd],
 348               [AS_HELP_STRING([--disable-nscd],
 349                [library functions will not contact the nscd daemon])],
 350               [use_nscd=$enableval],
 351               [use_nscd=yes])
 352
 353 AC_ARG_ENABLE([pt_chown],
 354               [AS_HELP_STRING([--enable-pt_chown],
 355                [Enable building and installing pt_chown])],
 356               [build_pt_chown=$enableval],
 357               [build_pt_chown=no])
 358 AC_SUBST(build_pt_chown)
 359 if test "$build_pt_chown" = yes; then
 360   AC_DEFINE(HAVE_PT_CHOWN)
 361 fi
 362
 363 # We keep the original values in `$config_*' and never modify them, so we
 364 # can write them unchanged into config.make.  Everything else uses
 365 # $machine, $vendor, and $os, and changes them whenever convenient.
 366 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 367
 368 # Don't allow vendor == "unknown"
 369 test "$config_vendor" = unknown && config_vendor=
 370 config_os="`echo $config_os | sed 's/^unknown-//'`"
 371
 372 # Some configurations imply other options.
 373 elf=yes
 374
 375 # The configure fragment of an add-on port can modify these to supplement
 376 # or override the table in the case statement below.  No fragment should
 377 # ever change the config_* variables, however.
 378 machine=$config_machine
 379 vendor=$config_vendor
 380 os=$config_os
 381 base_os=''
 382
 383 submachine=
 384 AC_ARG_WITH([cpu],
 385             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 386             [dnl
 387   case "$withval" in
 388   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 389   no) ;;
 390   *) submachine="$withval" ;;
 391   esac
 392 ])
 393
 394 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
 395 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 396
 397 # An add-on can set this when it wants to disable the sanity check below.
 398 libc_config_ok=no
 399
 400 dnl Having this here, though empty, makes sure that if add-ons' fragments
 401 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
 402 dnl our AC_OUTPUT will actually use it.
 403 AC_CONFIG_SUBDIRS()
 404
 405 case "$enable_add_ons" in
 406 ''|no) add_ons= ;;
 407 yes|'*')
 408  add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
 409           sed 's@/[[^/]]*$@@' | sort | uniq`
 410          add_ons_automatic=yes
 411          ;;
 412 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
 413        add_ons_automatic=no ;;
 414 esac
 415
 416 configured_add_ons=
 417 add_ons_sfx=
 418 add_ons_pfx=
 419 if test x"$add_ons" != x; then
 420   for f in $add_ons; do
 421     # Some sanity checks
 422     case "$f" in
 423     crypt)
 424       AC_MSG_ERROR([
 425 *** It seems that you're using an old \`crypt' add-on.  crypt is now
 426 *** part of glibc and using the old add-on will not work with this
 427 *** release.  Start again with fresh sources and without the old
 428 *** \`crypt' add-on.])
 429     ;;
 430     localedata)
 431       AC_MSG_ERROR([
 432 *** It seems that you're using an old \`localedata' add-on.  localedata
 433 *** is now part of glibc and using the old add-on will not work with
 434 *** this release.  Start again with fresh sources and without the old
 435 *** \`localedata' add-on.])
 436     ;;
 437     esac
 438   done
 439
 440   # Now source each add-on's configure fragment.
 441   # The fragments can use $srcdir/$libc_add_on to find themselves,
 442   # and test $add_ons_automatic to see if they were explicitly requested.
 443   # A fragment can clear (or even change) $libc_add_on to affect
 444   # whether it goes into the list to be actually used in the build.
 445   use_add_ons=
 446   for libc_add_on in $add_ons; do
 447     # Test whether such a directory really exists.
 448     # It can be absolute, or relative to $srcdir, or relative to the build dir.
 449     case "$libc_add_on" in
 450     /*)
 451       libc_add_on_srcdir=$libc_add_on
 452       ;;
 453     *)
 454       test -d "$srcdir/$libc_add_on" || {
 455         if test -d "$libc_add_on"; then
 456           libc_add_on="`pwd`/$libc_add_on"
 457         else
 458           AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
 459         fi
 460       }
 461       libc_add_on_srcdir=$srcdir/$libc_add_on
 462       ;;
 463     esac
 464
 465     libc_add_on_frag=$libc_add_on_srcdir/configure
 466     libc_add_on_canonical=
 467     libc_add_on_config_subdirs=
 468     if test -r "$libc_add_on_frag"; then
 469       AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
 470       libc_add_on_canonical=unknown
 471       libc_add_on_subdirs=
 472       . "$libc_add_on_frag"
 473       test -z "$libc_add_on" || {
 474         configured_add_ons="$configured_add_ons $libc_add_on"
 475         if test "x$libc_add_on_canonical" = xunknown; then
 476           AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
 477         fi
 478         for d in $libc_add_on_subdirs; do
 479           case "$libc_add_on" in
 480           /*) subdir_srcdir="$libc_add_on" ;;
 481           *) subdir_srcdir="\$(..)$libc_add_on" ;;
 482           esac
 483           case "$d" in
 484           .)
 485             d="${libc_add_on_canonical:-$libc_add_on}"
 486             ;;
 487           /*)
 488             subdir_srcdir="$d"
 489             ;;
 490           *)
 491             subdir_srcdir="$subdir_srcdir/$d"
 492             ;;
 493           esac
 494           d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
 495           add_on_subdirs="$add_on_subdirs $d"
 496           test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
 497 $d-srcdir = $subdir_srcdir"
 498         done
 499         for d in $libc_add_on_config_subdirs; do
 500           case "$d" in
 501           /*) AC_MSG_ERROR(dnl
 502 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
 503           esac
 504           if test ! -d "$libc_add_on_srcdir/$d"; then
 505             AC_MSG_ERROR(fragment wants to configure missing directory $d)
 506           fi
 507           case "$libc_add_on" in
 508           /*) AC_MSG_ERROR(dnl
 509 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
 510           esac
 511           subdirs="$subdirs $libc_add_on/$d"
 512         done
 513       }
 514     fi
 515     if test -n "$libc_add_on"; then
 516       LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
 517       use_add_ons="$use_add_ons $libc_add_on"
 518       add_ons_pfx="$add_ons_pfx $libc_add_on/"
 519       test -z "$libc_add_on_canonical" ||
 520       add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
 521     fi
 522   done
 523   # Use echo to strip excess whitespace.
 524   add_ons="`echo $use_add_ons`"
 525 fi
 526 AC_SUBST(add_ons)
 527 AC_SUBST(add_on_subdirs)
 528
 529
 530 ###
 531 ### I put this here to prevent those annoying emails from people who cannot
 532 ### read and try to compile glibc on unsupported platforms.  --drepper
 533 ###
 534 ### By using the undocumented --enable-hacker-mode option for configure
 535 ### one can skip this test to make the configuration not fail for unsupported
 536 ### platforms.
 537 ###
 538 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 539   case "$machine-$host_os" in
 540   *-linux* | *-gnu*)
 541     ;;
 542   *)
 543     echo "*** The GNU C library is currently not available for this platform."
 544     echo "*** So far nobody cared to port it and if there is no volunteer it"
 545     echo "*** might never happen.  So, if you have interest to see glibc on"
 546     echo "*** this platform visit"
 547     echo "***   http://www.gnu.org/software/libc/porting.html"
 548     echo "*** and join the group of porters"
 549     exit 1
 550     ;;
 551   esac
 552 fi
 553
 554 # Set base_machine if not set by a preconfigure fragment.
 555 test -n "$base_machine" || base_machine=$machine
 556 AC_SUBST(base_machine)
 557
 558 # For the multi-arch option we need support in the assembler & linker.
 559 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 560                libc_cv_ld_gnu_indirect_function, [dnl
 561 cat > conftest.S <<EOF
 562 .type foo,%gnu_indirect_function
 563 foo:
 564 .globl _start
 565 _start:
 566 .globl __start
 567 __start:
 568 .data
 569 #ifdef _LP64
 570 .quad foo
 571 #else
 572 .long foo
 573 #endif
 574 EOF
 575 libc_cv_ld_gnu_indirect_function=no
 576 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
 577             -nostartfiles -nostdlib \
 578             -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
 579   # Do a link to see if the backend supports IFUNC relocs.
 580   $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
 581   LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
 582     libc_cv_ld_gnu_indirect_function=yes
 583   }
 584 fi
 585 rm -f conftest*])
 586
 587 AC_MSG_CHECKING(whether .text pseudo-op must be used)
 588 AC_CACHE_VAL(libc_cv_dot_text, [dnl
 589 cat > conftest.s <<EOF
 590 .text
 591 EOF
 592 libc_cv_dot_text=
 593 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
 594   libc_cv_dot_text=.text
 595 fi
 596 rm -f conftest*])
 597 if test -z "$libc_cv_dot_text"; then
 598   AC_MSG_RESULT(no)
 599 else
 600   AC_MSG_RESULT(yes)
 601 fi
 602
 603 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
 604   if test x"$multi_arch" = xyes; then
 605     AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
 606   else
 607     multi_arch=no
 608   fi
 609 fi
 610 multi_arch_d=
 611 if test x"$multi_arch" != xno; then
 612   multi_arch_d=/multiarch
 613 fi
 614
 615 # Compute the list of sysdep directories for this configuration.
 616 # This can take a while to compute.
 617 sysdep_dir=$srcdir/sysdeps
 618 AC_MSG_CHECKING(sysdep dirs)
 619 dnl We need to use [ and ] for other purposes for a while now.
 620 changequote(,)dnl
 621 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 622 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 623
 624 test "x$base_os" != x || case "$os" in
 625 gnu*)
 626   base_os=mach/hurd ;;
 627 linux*)
 628   base_os=unix/sysv ;;
 629 esac
 630
 631 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 632 tail=$os
 633 ostry=$os
 634 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 635   ostry="$ostry /$o"
 636   tail=$o
 637 done
 638 o=`echo $tail | sed 's/[0-9]*$//'`
 639 if test $o != $tail; then
 640   ostry="$ostry /$o"
 641 fi
 642 # For linux-gnu, try linux-gnu, then linux.
 643 o=`echo $tail | sed 's/-.*$//'`
 644 if test $o != $tail; then
 645   ostry="$ostry /$o"
 646 fi
 647
 648 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 649 base=
 650 tail=$base_os
 651 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 652   set $b
 653   base="$base /$1"
 654   tail="$2"
 655 done
 656
 657 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 658 mach=
 659 tail=$machine${submachine:+/$submachine}
 660 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 661   set $m
 662   # Prepend the machine's FPU directory unless --without-fp.
 663   if test "$with_fp" = yes; then
 664     maybe_fpu=/fpu
 665   else
 666     maybe_fpu=/nofpu
 667   fi
 668   # For each machine term, try it with and then without /multiarch.
 669   for try_fpu in $maybe_fpu ''; do
 670     for try_multi in $multi_arch_d ''; do
 671       mach="$mach /$1$try_fpu$try_multi"
 672     done
 673   done
 674   tail="$2"
 675 done
 676
 677 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 678 changequote([,])dnl
 679
 680 # Find what sysdep directories exist.
 681 sysnames_add_ons=
 682 sysnames=
 683 for b in $base ''; do
 684   for m0 in $mach ''; do
 685     for v in /$vendor ''; do
 686       test "$v" = / && continue
 687       for o in /$ostry ''; do
 688         test "$o" = / && continue
 689         for m in $mach ''; do
 690           for d in $add_ons_pfx ''; do
 691             for a in $add_ons_sfx ''; do
 692               try_suffix="$m0$b$v$o$m"
 693               if test -n "$try_suffix"; then
 694                 try_srcdir="${srcdir}/"
 695                 case "$d" in
 696                 /*) try_srcdir= ;;
 697                 esac
 698                 try="${d}sysdeps$try_suffix$a"
 699                 test -n "$enable_debug_configure" &&
 700                 echo "$0 [DEBUG]: try $try" >&2
 701                 if test -d "$try_srcdir$try"; then
 702                   sysnames="$sysnames $try"
 703                   { test -n "$o" || test -n "$b"; } && os_used=t
 704                   { test -n "$m" || test -n "$m0"; } && machine_used=t
 705                   case x${m0:-$m} in
 706                   x*/$submachine) submachine_used=t ;;
 707                   esac
 708                   if test -n "$d"; then
 709                     case "$sysnames_add_ons" in
 710                     *" $d "*) ;;
 711                     *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 712                     esac
 713                   fi
 714                 fi
 715               fi
 716             done
 717           done
 718         done
 719       done
 720     done
 721   done
 722 done
 723
 724 # If the assembler supports gnu_indirect_function symbol type and the
 725 # architecture supports multi-arch, we enable multi-arch by default.
 726 case $sysnames_add_ons$sysnames in
 727 *"$multi_arch_d"*)
 728   ;;
 729 *)
 730   test x"$multi_arch" = xdefault && multi_arch=no
 731   ;;
 732 esac
 733 if test x"$multi_arch" != xno; then
 734   AC_DEFINE(USE_MULTIARCH)
 735 fi
 736 AC_SUBST(multi_arch)
 737
 738 if test -z "$os_used" && test "$os" != none; then
 739   AC_MSG_ERROR(Operating system $os is not supported.)
 740 fi
 741 if test -z "$machine_used" && test "$machine" != none; then
 742   AC_MSG_ERROR(The $machine is not supported.)
 743 fi
 744 if test -z "$submachine_used" && test -n "$submachine"; then
 745   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 746 fi
 747 AC_SUBST(submachine)
 748
 749 # We have now validated the configuration.
 750
 751 # Expand the list of system names into a full list of directories
 752 # from each element's parent name and Implies file (if present).
 753 set $sysnames
 754 names=
 755 while test $# -gt 0; do
 756   name=$1
 757   shift
 758
 759   case " $names " in *" $name "*)
 760     # Already in the list.
 761     continue
 762   esac
 763
 764   # Report each name as we discover it, so there is no long pause in output.
 765   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 766
 767   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 768
 769   case $name in
 770     /*) xsrcdir= ;;
 771     *)  xsrcdir=$srcdir/ ;;
 772   esac
 773   test -n "$enable_debug_configure" &&
 774   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 775
 776   for implies_file in Implies Implies-before Implies-after; do
 777     implies_type=`echo $implies_file | sed s/-/_/`
 778     eval ${implies_type}=
 779     if test -f $xsrcdir$name/$implies_file; then
 780       # Collect more names from the `Implies' file (removing comments).
 781       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
 782       for x in $implied_candidate; do
 783         found=no
 784         if test -d $xsrcdir$name_base/$x; then
 785           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
 786           found=yes
 787         fi
 788         for d in $add_ons_pfx ''; do
 789           try="${d}sysdeps/$x"
 790           case $d in
 791            /*) try_srcdir= ;;
 792            *) try_srcdir=$srcdir/ ;;
 793           esac
 794           test -n "$enable_debug_configure" &&
 795            echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
 796           if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 797           then
 798             eval "${implies_type}=\"\$${implies_type} \$try\""
 799             found=yes
 800             case "$sysnames_add_ons" in
 801             *" $d "*) ;;
 802             *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 803             esac
 804           fi
 805         done
 806         if test $found = no; then
 807           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
 808         fi
 809       done
 810     fi
 811   done
 812
 813   # Add NAME to the list of names.
 814   names="$names $name"
 815
 816   # Find the parent of NAME, using the empty string if it has none.
 817 changequote(,)dnl
 818   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 819 changequote([,])dnl
 820
 821   test -n "$enable_debug_configure" &&
 822     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
 823 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
 824
 825   # Add the names implied by NAME, and NAME's parent (if it has one), to
 826   # the list of names to be processed (the argument list).  We prepend the
 827   # implied names to the list and append the parent.  We want implied
 828   # directories to come before further directories inferred from the
 829   # configuration components; this ensures that for sysv4, unix/common
 830   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 831   # after sysv4).
 832   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
 833   test -n "$sysnames" && set $sysnames
 834 done
 835
 836 # Add the default directories.
 837 default_sysnames="sysdeps/generic"
 838 sysnames="$names $default_sysnames"
 839 AC_SUBST(sysnames)
 840 # The other names were emitted during the scan.
 841 AC_MSG_RESULT($default_sysnames)
 842
 843 # Collect the list of add-ons that supply partial sysdeps trees.
 844 sysdeps_add_ons=
 845 for add_on in $add_ons; do
 846   case "$add_on" in
 847   /*) xsrcdir= ;;
 848   *) xsrcdir="$srcdir/" ;;
 849   esac
 850
 851   test -d "$xsrcdir$add_on/sysdeps" || {
 852     case "$configured_add_ons " in
 853     *" $add_on "*) ;;
 854     *|'')
 855       AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
 856       ;;
 857     esac
 858     continue
 859   }
 860
 861   sysdeps_add_ons="$sysdeps_add_ons $add_on"
 862   case "$sysnames_add_ons" in
 863   *" $add_on/ "*) ;;
 864   *|'')
 865     AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
 866     continue ;;
 867   esac
 868
 869   found=no
 870   for d in $sysnames; do
 871     case "$d" in
 872     $add_on/sysdeps/*) ;;
 873     *) continue ;;
 874     esac
 875     (cd "$xsrcdir$d" && for f in *[[!~]]; do
 876        case "$f" in
 877        sys|bits)
 878          for ff in $f/*.h; do
 879            test -d "$ff" || { test -e "$ff" && exit 88; }
 880          done
 881          ;;
 882        *)
 883          test -d "$f" || { test -e "$f" && exit 88; }
 884          ;;
 885        esac
 886      done)
 887     if test $? -eq 88; then
 888       found=yes
 889       break
 890     fi
 891   done
 892   if test $found = no; then
 893     AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
 894   fi
 895 done
 896 AC_SUBST(sysdeps_add_ons)
 897
 898
 899 ### Locate tools.
 900
 901 AC_PROG_INSTALL
 902 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
 903   # The makefiles need to use a different form to find it in $srcdir.
 904   INSTALL='\$(..)./scripts/install-sh -c'
 905 fi
 906 AC_PROG_LN_S
 907
 908 LIBC_PROG_BINUTILS
 909
 910 # Accept binutils 2.22 or newer.
 911 AC_CHECK_PROG_VER(AS, $AS, --version,
 912                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
 913                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 914                   AS=: critic_missing="$critic_missing as")
 915 AC_CHECK_PROG_VER(LD, $LD, --version,
 916                   [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 917                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 918                   LD=: critic_missing="$critic_missing ld")
 919
 920 # These programs are version sensitive.
 921 AC_CHECK_TOOL_PREFIX
 922 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
 923   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
 924   [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
 925
 926 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
 927   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
 928   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
 929   MSGFMT=: aux_missing="$aux_missing msgfmt")
 930 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
 931   [GNU texinfo.* \([0-9][0-9.]*\)],
 932   [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
 933   MAKEINFO=: aux_missing="$aux_missing makeinfo")
 934 AC_CHECK_PROG_VER(SED, sed, --version,
 935   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
 936   [3.0[2-9]*|3.[1-9]*|[4-9]*],
 937   SED=: aux_missing="$aux_missing sed")
 938 AC_CHECK_PROG_VER(AWK, gawk, --version,
 939   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
 940   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
 941
 942 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
 943 AC_TRY_COMPILE([], [
 944 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
 945 #error insufficient compiler
 946 #endif],
 947                [libc_cv_compiler_ok=yes],
 948                [libc_cv_compiler_ok=no])])
 949 AS_IF([test $libc_cv_compiler_ok != yes],
 950       [critic_missing="$critic_missing compiler"])
 951
 952 AC_CHECK_TOOL(NM, nm, false)
 953
 954 if test "x$maintainer" = "xyes"; then
 955   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
 956   case "x$AUTOCONF" in
 957   xno|x|x:) AUTOCONF=no ;;
 958   *)
 959     AC_CACHE_CHECK(dnl
 960   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
 961     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
 962       libc_cv_autoconf_works=yes
 963     else
 964       libc_cv_autoconf_works=no
 965     fi])
 966     test $libc_cv_autoconf_works = yes || AUTOCONF=no
 967     ;;
 968   esac
 969   if test "x$AUTOCONF" = xno; then
 970     aux_missing="$aux_missing autoconf"
 971   fi
 972 else
 973   AUTOCONF=no
 974 fi
 975
 976 test -n "$critic_missing" && AC_MSG_ERROR([
 977 *** These critical programs are missing or too old:$critic_missing
 978 *** Check the INSTALL file for required versions.])
 979
 980 test -n "$aux_missing" && AC_MSG_WARN([
 981 *** These auxiliary programs are missing or incompatible versions:$aux_missing
 982 *** some features will be disabled.
 983 *** Check the INSTALL file for required versions.])
 984
 985 # if using special system headers, find out the compiler's sekrit
 986 # header directory and add that to the list.  NOTE: Only does the right
 987 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
 988 if test -n "$sysheaders"; then
 989   SYSINCLUDES=-nostdinc
 990   for d in include include-fixed; do
 991     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
 992     SYSINCLUDES="$SYSINCLUDES -isystem $i"
 993   done
 994   SYSINCLUDES="$SYSINCLUDES \
 995 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
 996   if test -n "$CXX"; then
 997     CXX_SYSINCLUDES=
 998     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
 999     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1000       test "x$cxxheaders" != x &&
1001       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1002     done
1003   fi
1004 fi
1005 AC_SUBST(SYSINCLUDES)
1006 AC_SUBST(CXX_SYSINCLUDES)
1007
1008 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1009 # since this would lead to problems installing/building glibc.
1010 # LD_LIBRARY_PATH contains the current directory if one of the following
1011 # is true:
1012 # - one of the terminals (":" and ";") is the first or last sign
1013 # - two terminals occur directly after each other
1014 # - the path contains an element with a dot in it
1015 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1016 changequote(,)dnl
1017 case ${LD_LIBRARY_PATH} in
1018   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1019     ld_library_path_setting="contains current directory"
1020     ;;
1021   *)
1022     ld_library_path_setting="ok"
1023     ;;
1024 esac
1025 changequote([,])dnl
1026 AC_MSG_RESULT($ld_library_path_setting)
1027 if test "$ld_library_path_setting" != "ok"; then
1028 AC_MSG_ERROR([
1029 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1030 *** building glibc. Please change the environment variable
1031 *** and run configure again.])
1032 fi
1033
1034 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1035 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1036   libc_cv_gcc_static_libgcc=
1037 else
1038   libc_cv_gcc_static_libgcc=-static-libgcc
1039 fi])
1040 AC_SUBST(libc_cv_gcc_static_libgcc)
1041
1042 AC_PATH_PROG(BASH_SHELL, bash, no)
1043
1044 AC_PATH_PROG(PERL, perl, no)
1045 if test "$PERL" != no &&
1046    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1047   PERL=no
1048 fi
1049 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1050              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1051 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1052
1053 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1054 AC_TRY_COMPILE(dnl
1055 [#define __need_size_t
1056 #define __need_wchar_t
1057 #include <stddef.h>
1058 #define __need_NULL
1059 #include <stddef.h>], [size_t size; wchar_t wchar;
1060 #ifdef offsetof
1061 #error stddef.h ignored __need_*
1062 #endif
1063 if (&size == NULL || &wchar == NULL) abort ();],
1064                libc_cv_friendly_stddef=yes,
1065                libc_cv_friendly_stddef=no)])
1066 if test $libc_cv_friendly_stddef = yes; then
1067   config_vars="$config_vars
1068 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1069 fi
1070
1071 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1072                libc_cv_need_minus_P, [dnl
1073 cat > conftest.S <<EOF
1074 #include "confdefs.h"
1075 /* Nothing whatsoever.  */
1076 EOF
1077 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1078   libc_cv_need_minus_P=no
1079 else
1080   libc_cv_need_minus_P=yes
1081 fi
1082 rm -f conftest*])
1083 if test $libc_cv_need_minus_P = yes; then
1084   config_vars="$config_vars
1085 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1086 fi
1087
1088 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1089 cat > conftest.s <<EOF
1090 ${libc_cv_dot_text}
1091 foo:
1092 .set glibc_conftest_frobozz,foo
1093 .globl glibc_conftest_frobozz
1094 EOF
1095 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1096 # (but it doesn't work), so we must do a linking check to be sure.
1097 cat > conftest1.c <<\EOF
1098 extern int glibc_conftest_frobozz;
1099 void _start() { glibc_conftest_frobozz = 1; }
1100 EOF
1101 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1102             -nostartfiles -nostdlib \
1103             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1104   libc_cv_asm_set_directive=yes
1105 else
1106   libc_cv_asm_set_directive=no
1107 fi
1108 rm -f conftest*])
1109 if test $libc_cv_asm_set_directive = yes; then
1110   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1111 fi
1112
1113 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1114                libc_cv_asm_unique_object, [dnl
1115 cat > conftest.s <<EOF
1116 ${libc_cv_dot_text}
1117 _sym:
1118 .type _sym, %gnu_unique_object
1119 EOF
1120 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1121   libc_cv_asm_unique_object=yes
1122 else
1123   libc_cv_asm_unique_object=no
1124 fi
1125 rm -f conftest*])
1126 if test $libc_cv_asm_unique_object = yes; then
1127   AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1128 fi
1129
1130 AC_CACHE_CHECK(for .previous assembler directive,
1131                libc_cv_asm_previous_directive, [dnl
1132 cat > conftest.s <<EOF
1133 .section foo_section
1134 .previous
1135 EOF
1136 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1137   libc_cv_asm_previous_directive=yes
1138 else
1139   libc_cv_asm_previous_directive=no
1140 fi
1141 rm -f conftest*])
1142 if test $libc_cv_asm_previous_directive = yes; then
1143   AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1144 else
1145   AC_CACHE_CHECK(for .popsection assembler directive,
1146                  libc_cv_asm_popsection_directive, [dnl
1147   cat > conftest.s <<EOF
1148 .pushsection foo_section
1149 .popsection
1150 EOF
1151   if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1152     libc_cv_asm_popsection_directive=yes
1153   else
1154     libc_cv_asm_popsection_directive=no
1155   fi
1156   rm -f conftest*])
1157   if test $libc_cv_asm_popsection_directive = yes; then
1158     AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1159   fi
1160 fi
1161 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1162                libc_cv_asm_protected_directive, [dnl
1163 cat > conftest.s <<EOF
1164 .protected foo
1165 foo:
1166 .hidden bar
1167 bar:
1168 EOF
1169 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1170   libc_cv_asm_protected_directive=yes
1171 else
1172   AC_MSG_ERROR(assembler support for symbol visibility is required)
1173 fi
1174 rm -f conftest*])
1175
1176 if test $libc_cv_asm_protected_directive = yes; then
1177   AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1178                  libc_cv_visibility_attribute,
1179                  [cat > conftest.c <<EOF
1180                   int foo __attribute__ ((visibility ("hidden"))) = 1;
1181                   int bar __attribute__ ((visibility ("protected"))) = 1;
1182 EOF
1183                   libc_cv_visibility_attribute=no
1184                   if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1185                     if grep '\.hidden.*foo' conftest.s >/dev/null; then
1186                       if grep '\.protected.*bar' conftest.s >/dev/null; then
1187                         libc_cv_visibility_attribute=yes
1188                       fi
1189                     fi
1190                   fi
1191                   rm -f conftest.{c,s}
1192                  ])
1193   if test $libc_cv_visibility_attribute != yes; then
1194     AC_MSG_ERROR(compiler support for visibility attribute is required)
1195   fi
1196 fi
1197
1198 if test $libc_cv_visibility_attribute = yes; then
1199   AC_CACHE_CHECK(for broken __attribute__((visibility())),
1200                  libc_cv_broken_visibility_attribute,
1201                  [cat > conftest.c <<EOF
1202                   int foo (int x);
1203                   int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1204                   int bar (int x) { return x; }
1205 EOF
1206                   libc_cv_broken_visibility_attribute=yes
1207                   if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1208 changequote(,)dnl
1209                     if grep '\.hidden[  _]foo' conftest.s >/dev/null; then
1210 changequote([,])dnl
1211                       libc_cv_broken_visibility_attribute=no
1212                     fi
1213                   fi
1214                   rm -f conftest.c conftest.s
1215                  ])
1216   if test $libc_cv_broken_visibility_attribute = yes; then
1217     AC_MSG_ERROR(working compiler support for visibility attribute is required)
1218   fi
1219 fi
1220
1221 AC_CACHE_CHECK(for broken __attribute__((alias())),
1222                libc_cv_broken_alias_attribute,
1223                [cat > conftest.c <<EOF
1224                extern int foo (int x) __asm ("xyzzy");
1225                int bar (int x) { return x; }
1226                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1227                extern int dfoo;
1228                extern __typeof (dfoo) dfoo __asm ("abccb");
1229                int dfoo = 1;
1230 EOF
1231                libc_cv_broken_alias_attribute=yes
1232                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1233                  if grep 'xyzzy' conftest.s >/dev/null &&
1234                     grep 'abccb' conftest.s >/dev/null; then
1235                    libc_cv_broken_alias_attribute=no
1236                  fi
1237                fi
1238                rm -f conftest.c conftest.s
1239                ])
1240 if test $libc_cv_broken_alias_attribute = yes; then
1241   AC_MSG_ERROR(working alias attribute support required)
1242 fi
1243
1244 if test $libc_cv_visibility_attribute = yes; then
1245   AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1246                  libc_cv_have_sdata_section,
1247                  [echo "int i;" > conftest.c
1248                   libc_cv_have_sdata_section=no
1249                   if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1250                      | grep '\.sdata' >/dev/null; then
1251                     libc_cv_have_sdata_section=yes
1252                   fi
1253                   rm -f conftest.c conftest.so
1254                  ])
1255   if test $libc_cv_have_sdata_section = yes; then
1256     AC_DEFINE(HAVE_SDATA_SECTION)
1257   fi
1258 fi
1259
1260 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1261                libc_cv_initfini_array, [dnl
1262 LIBC_TRY_LINK_STATIC([
1263 int foo (void) { return 1; }
1264 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1265 ],
1266   [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1267     libc_cv_initfini_array=yes
1268   else
1269     libc_cv_initfini_array=no
1270   fi],
1271   [libc_cv_initfini_array=no])
1272 ])
1273 if test $libc_cv_initfini_array != yes; then
1274   AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1275 fi
1276
1277 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1278                libc_cv_ctors_header, [dnl
1279   libc_cv_ctors_header=yes
1280   LIBC_TRY_LINK_STATIC([
1281 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1282 __attribute__ ((destructor))  void dtor (void) { asm (""); }
1283 ],
1284               [dnl
1285       AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1286         { gsub(/\@<:@ */, "@<:@") }
1287         $2 == ".ctors" || $2 == ".dtors" {
1288           size = strtonum("0x" $6)
1289           align = strtonum("0x" $NF)
1290           seen@<:@$2@:>@ = 1
1291           stub@<:@$2@:>@ = size == align * 2
1292         }
1293         END {
1294           ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1295           dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1296           exit ((ctors_ok && dtors_ok) ? 0 : 1)
1297         }
1298       '], [libc_cv_ctors_header=no])
1299     ], [dnl
1300       AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1301     ])
1302 ])
1303 if test $libc_cv_ctors_header = no; then
1304   AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1305 fi
1306
1307 AC_CACHE_CHECK(for libunwind-support in compiler,
1308                libc_cv_cc_with_libunwind, [
1309   cat > conftest.c <<EOF
1310 int main (void) { return 0; }
1311 EOF
1312   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1313      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1314     libc_cv_cc_with_libunwind=yes
1315   else
1316     libc_cv_cc_with_libunwind=no
1317   fi
1318   rm -f conftest*])
1319 AC_SUBST(libc_cv_cc_with_libunwind)
1320 if test $libc_cv_cc_with_libunwind = yes; then
1321   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1322 fi
1323
1324 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1325                     [libc_cv_z_nodelete=yes],
1326                     [AC_MSG_ERROR(linker with -z nodelete support required)])
1327
1328 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1329                     [libc_cv_z_nodlopen=yes],
1330                     [AC_MSG_ERROR(linker with -z nodlopen support required)])
1331
1332 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1333                     [libc_cv_z_initfirst=yes],
1334                     [AC_MSG_ERROR(linker with -z initfirst support required)])
1335
1336 AC_CACHE_CHECK(for -Bgroup option,
1337                libc_cv_Bgroup, [dnl
1338 cat > conftest.c <<EOF
1339 int _start (void) { return 42; }
1340 EOF
1341 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1342                             -fPIC -shared -o conftest.so conftest.c
1343                             -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1344 then
1345   libc_cv_Bgroup=yes
1346 else
1347   libc_cv_Bgroup=no
1348 fi
1349 rm -f conftest*])
1350 AC_SUBST(libc_cv_Bgroup)
1351
1352 ASFLAGS_config=
1353 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1354                libc_cv_as_noexecstack, [dnl
1355 cat > conftest.c <<EOF
1356 void foo (void) { }
1357 EOF
1358 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1359                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1360    && grep .note.GNU-stack conftest.s >/dev/null \
1361    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1362                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1363 then
1364   libc_cv_as_noexecstack=yes
1365 else
1366   libc_cv_as_noexecstack=no
1367 fi
1368 rm -f conftest*])
1369 if test $libc_cv_as_noexecstack = yes; then
1370   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1371 fi
1372 AC_SUBST(ASFLAGS_config)
1373
1374 AC_CACHE_CHECK(for -z combreloc,
1375                libc_cv_z_combreloc, [dnl
1376 cat > conftest.c <<EOF
1377 extern int bar (int);
1378 extern int mumble;
1379 int foo (void) { return bar (mumble); }
1380 EOF
1381 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1382                         -fPIC -shared -o conftest.so conftest.c
1383                         -nostdlib -nostartfiles
1384                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1385 then
1386 dnl The following test is a bit weak.  We must use a tool which can test
1387 dnl cross-platform since the gcc used can be a cross compiler.  Without
1388 dnl introducing new options this is not easily doable.  Instead use a tool
1389 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1390 dnl look for a section named .rel.dyn.
1391   if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1392     libc_cv_z_combreloc=yes
1393   else
1394     libc_cv_z_combreloc=no
1395   fi
1396 else
1397   libc_cv_z_combreloc=no
1398 fi
1399 rm -f conftest*])
1400 if test "$libc_cv_z_combreloc" = yes; then
1401   AC_DEFINE(HAVE_Z_COMBRELOC)
1402 fi
1403 AC_SUBST(libc_cv_z_combreloc)
1404
1405 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1406                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1407 AC_SUBST(libc_cv_z_execstack)
1408
1409 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1410 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1411 ])
1412
1413 AC_SUBST(libc_cv_fpie)
1414
1415 AC_CACHE_CHECK(for --hash-style option,
1416                libc_cv_hashstyle, [dnl
1417 cat > conftest.c <<EOF
1418 int _start (void) { return 42; }
1419 EOF
1420 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1421                             -fPIC -shared -o conftest.so conftest.c
1422                             -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1423 then
1424   libc_cv_hashstyle=yes
1425 else
1426   libc_cv_hashstyle=no
1427 fi
1428 rm -f conftest*])
1429 AC_SUBST(libc_cv_hashstyle)
1430
1431 # The linker's default -shared behavior is good enough if it
1432 # does these things that our custom linker scripts ensure that
1433 # all allocated NOTE sections come first.
1434 if test "$use_default_link" = default; then
1435   AC_CACHE_CHECK([for sufficient default -shared layout],
1436                   libc_cv_use_default_link, [dnl
1437   libc_cv_use_default_link=no
1438   cat > conftest.s <<\EOF
1439           .section .note.a,"a",%note
1440           .balign 4
1441           .long 4,4,9
1442           .string "GNU"
1443           .string "foo"
1444           .section .note.b,"a",%note
1445           .balign 4
1446           .long 4,4,9
1447           .string "GNU"
1448           .string "bar"
1449 EOF
1450   if AC_TRY_COMMAND([dnl
1451   ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1452        ac_try=`$READELF -S conftest.so | sed -n \
1453          ['${x;p;}
1454           s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
1455           t a
1456           b
1457           : a
1458           H']`
1459   then
1460     libc_seen_a=no libc_seen_b=no
1461     set -- $ac_try
1462     while test $# -ge 2 -a "$1" = NOTE; do
1463       case "$2" in
1464       .note.a) libc_seen_a=yes ;;
1465       .note.b) libc_seen_b=yes ;;
1466       esac
1467       shift 2
1468     done
1469     case "$libc_seen_a$libc_seen_b" in
1470     yesyes)
1471       libc_cv_use_default_link=yes
1472       ;;
1473     *)
1474       echo >&AS_MESSAGE_LOG_FD "\
1475 $libc_seen_a$libc_seen_b from:
1476 $ac_try"
1477       ;;
1478     esac
1479   fi
1480   rm -f conftest*])
1481   use_default_link=$libc_cv_use_default_link
1482 fi
1483
1484 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1485 if libc_cv_output_format=`
1486 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1487 then
1488   :
1489 else
1490   libc_cv_output_format=
1491 fi
1492 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1493 AC_SUBST(libc_cv_output_format)
1494
1495 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1496 cat > conftest.c <<EOF
1497 int foo;
1498 EOF
1499 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1500                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1501 then
1502   libc_cv_fno_toplevel_reorder=yes
1503 else
1504   libc_cv_fno_toplevel_reorder=no
1505 fi
1506 rm -f conftest*])
1507 if test $libc_cv_fno_toplevel_reorder = yes; then
1508   fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1509 else
1510   fno_unit_at_a_time=-fno-unit-at-a-time
1511 fi
1512 AC_SUBST(fno_unit_at_a_time)
1513
1514 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1515 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1516                    [libc_cv_ssp=yes],
1517                    [libc_cv_ssp=no])
1518 ])
1519 AC_SUBST(libc_cv_ssp)
1520
1521 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1522 cat > conftest.c <<EOF
1523 int foo;
1524 #ifdef __GNUC_GNU_INLINE__
1525 main () { return 0;}
1526 #else
1527 #error
1528 #endif
1529 EOF
1530 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1531                             -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1532 then
1533   libc_cv_gnu89_inline=yes
1534 else
1535   libc_cv_gnu89_inline=no
1536 fi
1537 rm -f conftest*])
1538 if test $libc_cv_gnu89_inline = yes; then
1539   gnu89_inline=-fgnu89-inline
1540 else
1541   gnu89_inline=
1542 fi
1543 AC_SUBST(gnu89_inline)
1544
1545 AC_CACHE_CHECK(whether cc puts quotes around section names,
1546                libc_cv_have_section_quotes,
1547                [cat > conftest.c <<EOF
1548                 static const int foo
1549                 __attribute__ ((section ("bar"))) = 1;
1550 EOF
1551                 if ${CC-cc} -S conftest.c -o conftest.s; then
1552                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1553                     libc_cv_have_section_quotes=yes
1554                   else
1555                     libc_cv_have_section_quotes=no
1556                   fi
1557                 else
1558                   libc_cv_have_section_quotes=unknown
1559                 fi
1560                 rm -f conftest.{c,s}
1561                 ])
1562 if test $libc_cv_have_section_quotes = yes; then
1563   AC_DEFINE(HAVE_SECTION_QUOTES)
1564 fi
1565
1566 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1567                [dnl
1568 cat > conftest.s <<EOF
1569 ${libc_cv_dot_text}
1570 .globl foo
1571 foo:
1572 .weak foo
1573 .weak bar; bar = foo
1574 EOF
1575 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1576   libc_cv_asm_weak_directive=yes
1577 else
1578   libc_cv_asm_weak_directive=no
1579 fi
1580 rm -f conftest*])
1581
1582 if test $libc_cv_asm_weak_directive = no; then
1583   AC_CACHE_CHECK(for assembler .weakext directive,
1584                  libc_cv_asm_weakext_directive,
1585                  [dnl
1586 cat > conftest.s <<EOF
1587 ${libc_cv_dot_text}
1588 .globl foo
1589 foo:
1590 .weakext bar foo
1591 .weakext baz
1592 .globl baz
1593 baz:
1594 EOF
1595   if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1596     libc_cv_asm_weakext_directive=yes
1597   else
1598     libc_cv_asm_weakext_directive=no
1599   fi
1600   rm -f conftest*])
1601
1602 fi # no .weak
1603
1604 if test $libc_cv_asm_weak_directive = yes; then
1605   AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1606 elif test $libc_cv_asm_weakext_directive = yes; then
1607   AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1608 fi
1609
1610 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1611 cat > conftest.c <<\EOF
1612 _start () {}
1613 int __eh_pc;
1614 __throw () {}
1615 EOF
1616 dnl No \ in command here because it ends up inside ''.
1617 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1618                             -nostdlib -nostartfiles -Wl,--no-whole-archive
1619                             -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1620   libc_cv_ld_no_whole_archive=yes
1621 else
1622   libc_cv_ld_no_whole_archive=no
1623 fi
1624 rm -f conftest*])
1625 if test $libc_cv_ld_no_whole_archive = no; then
1626   AC_MSG_ERROR([support for --no-whole-archive is needed])
1627 fi
1628
1629 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1630 cat > conftest.c <<\EOF
1631 _start () {}
1632 int __eh_pc;
1633 __throw () {}
1634 EOF
1635 dnl No \ in command here because it ends up inside ''.
1636 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1637                             -nostdlib -nostartfiles -fexceptions
1638                             -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1639   libc_cv_gcc_exceptions=yes
1640 else
1641   libc_cv_gcc_exceptions=no
1642 fi
1643 rm -f conftest*])
1644 if test $libc_cv_gcc_exceptions = yes; then
1645   exceptions=-fexceptions
1646 fi
1647 AC_SUBST(exceptions)dnl
1648
1649 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1650 cat > conftest.c <<\EOF
1651 void zero (void *x)
1652 {
1653   __builtin_memset (x, 0, 1000);
1654 }
1655 EOF
1656 dnl
1657 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1658 then
1659   libc_cv_gcc_builtin_memset=no
1660 else
1661   libc_cv_gcc_builtin_memset=yes
1662 fi
1663 rm -f conftest* ])
1664 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1665   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1666 fi
1667
1668 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1669 cat > conftest.c <<\EOF
1670 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1671 char *foo (const char *a, const char *b)
1672 {
1673   return __builtin_strstr (a, b);
1674 }
1675 EOF
1676 dnl
1677 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1678 then
1679   libc_cv_gcc_builtin_redirection=yes
1680 else
1681   libc_cv_gcc_builtin_redirection=no
1682 fi
1683 rm -f conftest* ])
1684 if test "$libc_cv_gcc_builtin_redirection" = no; then
1685   AC_MSG_ERROR([support for the symbol redirection needed])
1686 fi
1687
1688 dnl Check whether the compiler supports the __thread keyword.
1689 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1690 [cat > conftest.c <<\EOF
1691 __thread int a = 42;
1692 EOF
1693 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1694   libc_cv_gcc___thread=yes
1695 else
1696   libc_cv_gcc___thread=no
1697 fi
1698 rm -f conftest*])
1699 if test "$libc_cv_gcc___thread" = no; then
1700   AC_MSG_ERROR([support for the __thread keyword is required])
1701 fi
1702
1703 dnl Check whether the compiler supports the tls_model attribute.
1704 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1705 cat > conftest.c <<\EOF
1706 extern __thread int a __attribute__((tls_model ("initial-exec")));
1707 EOF
1708 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1709   libc_cv_gcc_tls_model_attr=yes
1710 else
1711   libc_cv_gcc_tls_model_attr=no
1712 fi
1713 rm -f conftest*])
1714 if test "$libc_cv_gcc_tls_model_attr" = no; then
1715   AC_MSG_ERROR([support for the tls_model attribute is required])
1716 fi
1717
1718 dnl Determine how to disable generation of FMA instructions.
1719 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1720                libc_cv_cc_nofma, [dnl
1721 libc_cv_cc_nofma=
1722 for opt in -ffp-contract=off -mno-fused-madd; do
1723   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1724 done])
1725 AC_SUBST(libc_cv_cc_nofma)
1726
1727 if test -n "$submachine"; then
1728   AC_CACHE_CHECK([for compiler option for CPU variant],
1729                  libc_cv_cc_submachine, [dnl
1730   libc_cv_cc_submachine=no
1731   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1732     LIBC_TRY_CC_OPTION([$opt], [
1733       libc_cv_cc_submachine="$opt"
1734       break], [])
1735   done])
1736   if test "x$libc_cv_cc_submachine" = xno; then
1737     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1738   fi
1739 fi
1740 AC_SUBST(libc_cv_cc_submachine)
1741
1742 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1743 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1744 cat > conftest.c <<EOF
1745 void
1746 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1747 foo (void) {}
1748 EOF
1749 libc_cv_cc_loop_to_function=no
1750 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1751 then
1752   libc_cv_cc_loop_to_function=yes
1753 fi
1754 rm -f conftest*])
1755 if test $libc_cv_cc_loop_to_function = yes; then
1756   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1757 fi
1758 AC_SUBST(libc_cv_cc_loop_to_function)
1759
1760 dnl Check whether we have the gd library available.
1761 AC_MSG_CHECKING(for libgd)
1762 if test "$with_gd" != "no"; then
1763   old_CFLAGS="$CFLAGS"
1764   CFLAGS="$CFLAGS $libgd_include"
1765   old_LDFLAGS="$LDFLAGS"
1766   LDFLAGS="$LDFLAGS $libgd_ldflags"
1767   old_LIBS="$LIBS"
1768   LIBS="$LIBS -lgd -lpng -lz -lm"
1769   AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1770   CFLAGS="$old_CFLAGS"
1771   LDFLAGS="$old_LDFLAGS"
1772   LIBS="$old_LIBS"
1773 else
1774   LIBGD=no
1775 fi
1776 AC_MSG_RESULT($LIBGD)
1777 AC_SUBST(LIBGD)
1778
1779 # SELinux detection
1780 if test x$with_selinux = xno ; then
1781   have_selinux=no;
1782 else
1783   # See if we have the SELinux library
1784   AC_CHECK_LIB(selinux, is_selinux_enabled,
1785                have_selinux=yes, have_selinux=no)
1786   if test x$with_selinux = xyes ; then
1787     if test x$have_selinux = xno ; then
1788       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1789     fi
1790   fi
1791 fi
1792 # Check if we're building with SELinux support.
1793 if test "x$have_selinux" = xyes; then
1794   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1795
1796   # See if we have the libaudit library
1797   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1798                have_libaudit=yes, have_libaudit=no)
1799   if test "x$have_libaudit" = xyes; then
1800     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1801   fi
1802   AC_SUBST(have_libaudit)
1803
1804   # See if we have the libcap library
1805   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1806   if test "x$have_libcap" = xyes; then
1807     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1808   fi
1809   AC_SUBST(have_libcap)
1810 fi
1811 AC_SUBST(have_selinux)
1812
1813 dnl check for the size of 'long double'.
1814 AC_CHECK_SIZEOF(long double, 0)
1815 sizeof_long_double=$ac_cv_sizeof_long_double
1816 AC_SUBST(sizeof_long_double)
1817
1818 CPPUNDEFS=
1819 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1820 dnl Since we are building the implementations of the fortified functions here,
1821 dnl having the macro defined interacts very badly.
1822 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1823 [AC_TRY_COMPILE([], [
1824 #ifdef _FORTIFY_SOURCE
1825 # error bogon
1826 #endif],
1827                 [libc_cv_predef_fortify_source=no],
1828                 [libc_cv_predef_fortify_source=yes])])
1829 if test $libc_cv_predef_fortify_source = yes; then
1830   CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1831 fi
1832 AC_SUBST(CPPUNDEFS)
1833
1834 dnl Check for silly hacked compilers inserting -fstack-protector.
1835 dnl This breaks badly for the early startup code we compile, since
1836 dnl the compiled code can refer to a magic machine-dependent location
1837 dnl for the canary value before we have sufficient setup for that to
1838 dnl work.  It's also questionable to build all of libc with this flag
1839 dnl even when you're doing that for most applications you build, since
1840 dnl libc's code is so heavily-used and performance-sensitive.  If we
1841 dnl ever really want to make that work, it should be enabled explicitly
1842 dnl in the libc build, not inherited from implicit compiler settings.
1843 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1844                libc_cv_predef_stack_protector, [
1845 AC_TRY_COMPILE([extern void foobar (char *);],
1846                [char large_array[2048]; foobar (large_array);], [
1847 libc_undefs=`$NM -u conftest.o |
1848   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1849     2>&AS_MESSAGE_LOG_FD` || {
1850   AC_MSG_ERROR([confusing output from $NM -u])
1851 }
1852 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1853 # On some architectures, there are architecture-specific undefined
1854 # symbols (resolved by the linker), so filter out unknown symbols.
1855 # This will fail to produce the correct result if the compiler
1856 # defaults to -fstack-protector but this produces an undefined symbol
1857 # other than __stack_chk_fail.  However, compilers like that have not
1858 # been encountered in practice.
1859 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1860 case "$libc_undefs" in
1861 foobar) libc_cv_predef_stack_protector=no ;;
1862 '__stack_chk_fail
1863 foobar') libc_cv_predef_stack_protector=yes ;;
1864 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1865 esac],
1866                [AC_MSG_ERROR([test compilation failed])])
1867 ])
1868 libc_extra_cflags=
1869 if test $libc_cv_predef_stack_protector = yes; then
1870   libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1871 fi
1872 libc_extra_cppflags=
1873
1874 # Some linkers on some architectures support __ehdr_start but with
1875 # bugs.  Make sure usage of it does not create relocations in the
1876 # output (as the linker should resolve them all for us).
1877 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1878                libc_cv_ehdr_start, [
1879 old_CFLAGS="$CFLAGS"
1880 old_LDFLAGS="$LDFLAGS"
1881 old_LIBS="$LIBS"
1882 CFLAGS="$CFLAGS -fPIC"
1883 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1884 LIBS=
1885 AC_LINK_IFELSE([AC_LANG_SOURCE([
1886 typedef struct {
1887   char foo;
1888   long val;
1889 } Ehdr;
1890 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1891 long ehdr (void) { return __ehdr_start.val; }
1892 ])],
1893                [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1894                   libc_cv_ehdr_start=broken
1895                 else
1896                   libc_cv_ehdr_start=yes
1897                 fi], [libc_cv_ehdr_start=no])
1898 CFLAGS="$old_CFLAGS"
1899 LDFLAGS="$old_LDFLAGS"
1900 LIBS="$old_LIBS"
1901 ])
1902 if test "$libc_cv_ehdr_start" = yes; then
1903   AC_DEFINE([HAVE_EHDR_START])
1904 elif test "$libc_cv_ehdr_start" = broken; then
1905   AC_MSG_WARN([linker is broken -- you should upgrade])
1906 fi
1907
1908 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1909                libc_cv_builtin_trap, [dnl
1910 libc_cv_builtin_trap=no
1911 AC_TRY_COMPILE([], [__builtin_trap ()], [
1912 libc_undefs=`$NM -u conftest.o |
1913   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1914     2>&AS_MESSAGE_LOG_FD` || {
1915   AC_MSG_ERROR([confusing output from $NM -u])
1916 }
1917 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1918 if test -z "$libc_undefs"; then
1919   libc_cv_builtin_trap=yes
1920 fi])])
1921 if test $libc_cv_builtin_trap = yes; then
1922   AC_DEFINE([HAVE_BUILTIN_TRAP])
1923 fi
1924
1925 ### End of automated tests.
1926 ### Now run sysdeps configure fragments.
1927
1928 # They also can set these variables.
1929 use_ldconfig=no
1930 ldd_rewrite_script=no
1931 libc_cv_sysconfdir=$sysconfdir
1932 libc_cv_localstatedir=$localstatedir
1933 libc_cv_gcc_unwind_find_fde=no
1934 libc_cv_idn=no
1935
1936 # Iterate over all the sysdep directories we will use, running their
1937 # configure fragments.
1938 for dir in $sysnames; do
1939   case $dir in
1940     /*) dest=$dir ;;
1941     *)  dest=$srcdir/$dir ;;
1942   esac
1943   if test -r $dest/configure; then
1944     AC_MSG_RESULT(running configure fragment for $dir)
1945     . $dest/configure
1946   fi
1947 done
1948
1949 AC_SUBST(libc_extra_cflags)
1950 AC_SUBST(libc_extra_cppflags)
1951
1952 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1953   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1954 fi
1955 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1956
1957 # A sysdeps configure fragment can reset this if IFUNC is not actually
1958 # usable even though the assembler knows how to generate the symbol type.
1959 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1960   AC_DEFINE(HAVE_IFUNC)
1961 fi
1962
1963 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1964 # configure fragment can override the value to prevent this AC_DEFINE.
1965 AC_SUBST(use_nscd)
1966 if test "x$use_nscd" != xno; then
1967   AC_DEFINE([USE_NSCD])
1968 fi
1969 if test "x$build_nscd" = xdefault; then
1970   build_nscd=$use_nscd
1971 fi
1972
1973 # Test for old glibc 2.0.x headers so that they can be removed properly
1974 # Search only in includedir.
1975 AC_MSG_CHECKING(for old glibc 2.0.x headers)
1976 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
1977 then
1978   old_glibc_headers=yes
1979 else
1980   old_glibc_headers=no
1981 fi
1982 AC_MSG_RESULT($old_glibc_headers)
1983 if test ${old_glibc_headers} = yes; then
1984   AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
1985   AC_MSG_WARN(*** be removed.)
1986 fi
1987 AC_SUBST(old_glibc_headers)
1988
1989 AC_SUBST(libc_cv_slibdir)
1990 AC_SUBST(libc_cv_rtlddir)
1991 AC_SUBST(libc_cv_localedir)
1992 AC_SUBST(libc_cv_sysconfdir)
1993 AC_SUBST(libc_cv_localstatedir)
1994 AC_SUBST(libc_cv_rootsbindir)
1995 AC_SUBST(libc_cv_forced_unwind)
1996
1997 if test x$use_ldconfig = xyes; then
1998   AC_DEFINE(USE_LDCONFIG)
1999 fi
2000 AC_SUBST(use_ldconfig)
2001 AC_SUBST(ldd_rewrite_script)
2002
2003 AC_SUBST(static)
2004 AC_SUBST(shared)
2005
2006 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2007 [libc_cv_pic_default=yes
2008 cat > conftest.c <<EOF
2009 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2010 # error PIC is default.
2011 #endif
2012 EOF
2013 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2014   libc_cv_pic_default=no
2015 fi
2016 rm -f conftest.*])
2017 AC_SUBST(libc_cv_pic_default)
2018
2019 AC_SUBST(profile)
2020 AC_SUBST(static_nss)
2021
2022 AC_SUBST(DEFINES)
2023
2024 dnl See sysdeps/mach/configure.ac for this variable.
2025 AC_SUBST(mach_interface_list)
2026
2027 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2028 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2029 AC_SUBST(VERSION)
2030 AC_SUBST(RELEASE)
2031
2032 AC_CONFIG_FILES([config.make Makefile])
2033 AC_CONFIG_COMMANDS([default],[[
2034 case $CONFIG_FILES in *config.make*)
2035 echo "$config_vars" >> config.make;;
2036 esac
2037 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2038 AC_OUTPUT