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 AC_CHECK_TOOL(READELF, readelf, false)
  54
  55 # We need the C++ compiler only for testing.
  56 AC_PROG_CXX
  57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
  58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
  59 AC_LANG_PUSH([C++])
  60 # Default, dynamic case.
  61 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  62                [libc_cv_cxx_link_ok=yes],
  63                [libc_cv_cxx_link_ok=no])
  64 # Static case.
  65 old_LDFLAGS="$LDFLAGS"
  66 LDFLAGS="$LDFLAGS -static"
  67 AC_LINK_IFELSE([AC_LANG_SOURCE([
  68 #include <iostream>
  69
  70 int
  71 main()
  72 {
  73   std::cout << "Hello, world!";
  74   return 0;
  75 }
  76 ])],
  77                [],
  78                [libc_cv_cxx_link_ok=no])
  79 LDFLAGS="$old_LDFLAGS"
  80 AC_LANG_POP([C++])])
  81 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
  82
  83 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
  84   AC_MSG_ERROR([you must configure in a separate build directory])
  85 fi
  86
  87 # This will get text that should go into config.make.
  88 config_vars=
  89
  90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  91 AC_ARG_WITH([gd],
  92             AC_HELP_STRING([--with-gd=DIR],
  93                            [find libgd include dir and library with prefix DIR]),
  94             [dnl
  95 case "$with_gd" in
  96 yes|''|no) ;;
  97 *) libgd_include="-I$withval/include"
  98    libgd_ldflags="-L$withval/lib" ;;
  99 esac
 100 ])
 101 AC_ARG_WITH([gd-include],
 102             AC_HELP_STRING([--with-gd-include=DIR],
 103                            [find libgd include files in DIR]),
 104             [dnl
 105 case "$with_gd_include" in
 106 ''|no) ;;
 107 *) libgd_include="-I$withval" ;;
 108 esac
 109 ])
 110 AC_ARG_WITH([gd-lib],
 111             AC_HELP_STRING([--with-gd-lib=DIR],
 112                            [find libgd library files in DIR]),
 113             [dnl
 114 case "$with_gd_lib" in
 115 ''|no) ;;
 116 *) libgd_ldflags="-L$withval" ;;
 117 esac
 118 ])
 119
 120 if test -n "$libgd_include"; then
 121   config_vars="$config_vars
 122 CFLAGS-memusagestat.c = $libgd_include"
 123 fi
 124 if test -n "$libgd_ldflags"; then
 125   config_vars="$config_vars
 126 libgd-LDFLAGS = $libgd_ldflags"
 127 fi
 128
 129 dnl Arguments to specify presence of other packages/features.
 130 AC_ARG_WITH([fp],
 131             AC_HELP_STRING([--with-fp],
 132                            [if using floating-point hardware @<:@default=yes@:>@]),
 133             [with_fp=$withval],
 134             [with_fp=yes])
 135 AC_SUBST(with_fp)
 136 AC_ARG_WITH([binutils],
 137             AC_HELP_STRING([--with-binutils=PATH],
 138                            [specify location of binutils (as and ld)]),
 139             [path_binutils=$withval],
 140             [path_binutils=''])
 141 AC_ARG_WITH([selinux],
 142             AC_HELP_STRING([--with-selinux],
 143                            [if building with SELinux support]),
 144             [with_selinux=$withval],
 145             [with_selinux=auto])
 146
 147 AC_ARG_WITH([headers],
 148             AC_HELP_STRING([--with-headers=PATH],
 149                            [location of system headers to use
 150                             (for example /usr/src/linux/include)
 151                             @<:@default=compiler default@:>@]),
 152             [sysheaders=$withval],
 153             [sysheaders=''])
 154 AC_SUBST(sysheaders)
 155
 156 AC_SUBST(use_default_link)
 157 AC_ARG_WITH([default-link],
 158             AC_HELP_STRING([--with-default-link],
 159                            [do not use explicit linker scripts]),
 160             [use_default_link=$withval],
 161             [use_default_link=default])
 162
 163 AC_ARG_ENABLE([sanity-checks],
 164               AC_HELP_STRING([--disable-sanity-checks],
 165                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 166               [enable_sanity=$enableval],
 167               [enable_sanity=yes])
 168
 169 AC_ARG_ENABLE([shared],
 170               AC_HELP_STRING([--enable-shared],
 171                              [build shared library @<:@default=yes if GNU ld@:>@]),
 172               [shared=$enableval],
 173               [shared=yes])
 174 AC_ARG_ENABLE([profile],
 175               AC_HELP_STRING([--enable-profile],
 176                              [build profiled library @<:@default=no@:>@]),
 177               [profile=$enableval],
 178               [profile=no])
 179 AC_ARG_ENABLE([timezone-tools],
 180               AC_HELP_STRING([--disable-timezone-tools],
 181                              [do not install timezone tools @<:@default=install@:>@]),
 182               [enable_timezone_tools=$enableval],
 183               [enable_timezone_tools=yes])
 184 AC_SUBST(enable_timezone_tools)
 185
 186 AC_ARG_ENABLE([hardcoded-path-in-tests],
 187               AC_HELP_STRING([--enable-hardcoded-path-in-tests],
 188                              [hardcode newly built glibc path in tests @<:@default=no@:>@]),
 189               [hardcoded_path_in_tests=$enableval],
 190               [hardcoded_path_in_tests=no])
 191 AC_SUBST(hardcoded_path_in_tests)
 192
 193 AC_ARG_ENABLE([stackguard-randomization],
 194               AC_HELP_STRING([--enable-stackguard-randomization],
 195                              [initialize __stack_chk_guard canary with a random number at program start]),
 196               [enable_stackguard_randomize=$enableval],
 197               [enable_stackguard_randomize=no])
 198 if test "$enable_stackguard_randomize" = yes; then
 199   AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
 200 fi
 201
 202 AC_ARG_ENABLE([lock-elision],
 203               AC_HELP_STRING([--enable-lock-elision[=yes/no]],
 204                              [Enable lock elision for pthread mutexes by default]),
 205               [enable_lock_elision=$enableval],
 206               [enable_lock_elision=no])
 207 AC_SUBST(enable_lock_elision)
 208 if test "$enable_lock_elision" = yes ; then
 209   AC_DEFINE(ENABLE_LOCK_ELISION)
 210 fi
 211
 212 dnl Generic infrastructure for drop-in additions to libc.
 213 AC_ARG_ENABLE([add-ons],
 214               AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
 215                              [configure and build add-ons in DIR1,DIR2,...
 216                               search for add-ons if no parameter given]),
 217                              , [enable_add_ons=yes])
 218
 219 AC_ARG_ENABLE([hidden-plt],
 220               AC_HELP_STRING([--disable-hidden-plt],
 221                              [do not hide internal function calls to avoid PLT]),
 222               [hidden=$enableval],
 223               [hidden=yes])
 224 if test "x$hidden" = xno; then
 225   AC_DEFINE(NO_HIDDEN)
 226 fi
 227
 228 AC_ARG_ENABLE([bind-now],
 229               AC_HELP_STRING([--enable-bind-now],
 230                              [disable lazy relocations in DSOs]),
 231               [bindnow=$enableval],
 232               [bindnow=no])
 233 AC_SUBST(bindnow)
 234 if test "x$bindnow" = xyes; then
 235   AC_DEFINE(BIND_NOW)
 236 fi
 237
 238 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
 239 dnl -fstack-protector-strong.
 240 AC_ARG_ENABLE([stack-protector],
 241               AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
 242                              [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
 243               [enable_stack_protector=$enableval],
 244               [enable_stack_protector=no])
 245 case "$enable_stack_protector" in
 246 all|yes|no|strong) ;;
 247 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
 248 esac
 249
 250 dnl On some platforms we cannot use dynamic loading.  We must provide
 251 dnl static NSS modules.
 252 AC_ARG_ENABLE([static-nss],
 253               AC_HELP_STRING([--enable-static-nss],
 254                              [build static NSS modules @<:@default=no@:>@]),
 255               [static_nss=$enableval],
 256               [static_nss=no])
 257 dnl Enable static NSS also if we build no shared objects.
 258 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 259   static_nss=yes
 260   AC_DEFINE(DO_STATIC_NSS)
 261 fi
 262
 263 AC_ARG_ENABLE([force-install],
 264               AC_HELP_STRING([--disable-force-install],
 265                              [don't force installation of files from this package, even if they are older than the installed files]),
 266               [force_install=$enableval],
 267               [force_install=yes])
 268 AC_SUBST(force_install)
 269
 270 AC_ARG_ENABLE([maintainer-mode],
 271               AC_HELP_STRING([--enable-maintainer-mode],
 272                              [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
 273               [maintainer=$enableval],
 274               [maintainer=no])
 275
 276 dnl On some platforms we allow dropping compatibility with all kernel
 277 dnl versions.
 278 AC_ARG_ENABLE([kernel],
 279               AC_HELP_STRING([--enable-kernel=VERSION],
 280                              [compile for compatibility with kernel not older than VERSION]),
 281               [minimum_kernel=$enableval],
 282               [])
 283 dnl Prevent unreasonable values.
 284 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 285   # Better nothing than this.
 286   minimum_kernel=""
 287 else
 288   if test "$minimum_kernel" = current; then
 289     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 290   fi
 291 fi
 292
 293 dnl For the development we sometimes want gcc to issue even more warnings.
 294 dnl This is not the default since many of the extra warnings are not
 295 dnl appropriate.
 296 AC_ARG_ENABLE([all-warnings],
 297               AC_HELP_STRING([--enable-all-warnings],
 298                              [enable all useful warnings gcc can issue]),
 299               [all_warnings=$enableval],
 300               [])
 301 AC_SUBST(all_warnings)
 302
 303 AC_ARG_ENABLE([werror],
 304               AC_HELP_STRING([--disable-werror],
 305                              [do not build with -Werror]),
 306               [enable_werror=$enableval],
 307               [enable_werror=yes])
 308 AC_SUBST(enable_werror)
 309
 310 AC_ARG_ENABLE([multi-arch],
 311               AC_HELP_STRING([--enable-multi-arch],
 312                              [enable single DSO with optimizations for multiple architectures]),
 313               [multi_arch=$enableval],
 314               [multi_arch=default])
 315
 316 AC_ARG_ENABLE([nss-crypt],
 317               AC_HELP_STRING([--enable-nss-crypt],
 318                              [enable libcrypt to use nss]),
 319               [nss_crypt=$enableval],
 320               [nss_crypt=no])
 321 if test x$nss_crypt = xyes; then
 322   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 323   if test $? -ne 0; then
 324     AC_MSG_ERROR([cannot find include directory with nss-config])
 325   fi
 326   old_CFLAGS="$CFLAGS"
 327   CFLAGS="$CFLAGS $nss_includes"
 328   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 329 #include <hasht.h>
 330 #include <nsslowhash.h>
 331 void f (void) { NSSLOW_Init (); }])],
 332              libc_cv_nss_crypt=yes,
 333              AC_MSG_ERROR([
 334 cannot find NSS headers with lowlevel hash function interfaces]))
 335   old_LIBS="$LIBS"
 336   old_LDFLAGS="$LDFLAGS"
 337   LIBS="$LIBS -lfreebl3"
 338   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 339 #include <hasht.h>
 340 #include <nsslowhash.h>],
 341                                   [NSSLOW_Init();])],
 342                  libc_cv_nss_crypt=yes,
 343                  AC_MSG_ERROR([
 344 cannot link program using lowlevel NSS hash functions]))
 345   # Check to see if there is a static NSS cryptographic library.
 346   # If there isn't then we can't link anything with libcrypt.a,
 347   # and that might mean disabling some static tests.
 348   LDFLAGS="$LDFLAGS -static"
 349   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 350 #include <hasht.h>
 351 #include <nsslowhash.h>],
 352                                   [NSSLOW_Init();])],
 353                  libc_cv_static_nss_crypt=yes,
 354                  libc_cv_static_nss_crypt=no)
 355   LDFLAGS="$old_LDFLAGS"
 356   CFLAGS="$old_CFLAGS"
 357   LIBS="$old_LIBS"
 358 else
 359   libc_cv_nss_crypt=no
 360   libc_cv_static_nss_crypt=no
 361 fi
 362 AC_SUBST(libc_cv_nss_crypt)
 363 AC_SUBST(libc_cv_static_nss_crypt)
 364
 365
 366 AC_ARG_ENABLE([obsolete-rpc],
 367               AC_HELP_STRING([--enable-obsolete-rpc],
 368                              [build and install the obsolete RPC code for link-time usage]),
 369               [link_obsolete_rpc=$enableval],
 370               [link_obsolete_rpc=no])
 371 AC_SUBST(link_obsolete_rpc)
 372
 373 if test "$link_obsolete_rpc" = yes; then
 374   AC_DEFINE(LINK_OBSOLETE_RPC)
 375 fi
 376
 377 AC_ARG_ENABLE([systemtap],
 378               [AS_HELP_STRING([--enable-systemtap],
 379                [enable systemtap static probe points @<:@default=no@:>@])],
 380               [systemtap=$enableval],
 381               [systemtap=no])
 382 if test "x$systemtap" != xno; then
 383   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 384   old_CFLAGS="$CFLAGS"
 385   CFLAGS="-std=gnu11 $CFLAGS"
 386   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 387 void foo (int i, void *p)
 388 {
 389   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 390        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 391 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 392   CFLAGS="$old_CFLAGS"])
 393   if test $libc_cv_sdt = yes; then
 394     AC_DEFINE([USE_STAP_PROBE])
 395   elif test "x$systemtap" != xauto; then
 396     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 397   fi
 398 fi
 399
 400 AC_ARG_ENABLE([build-nscd],
 401               [AS_HELP_STRING([--disable-build-nscd],
 402                [disable building and installing the nscd daemon])],
 403               [build_nscd=$enableval],
 404               [build_nscd=default])
 405 AC_SUBST(build_nscd)
 406
 407 # Note the use of $use_nscd is near the bottom of the file.
 408 AC_ARG_ENABLE([nscd],
 409               [AS_HELP_STRING([--disable-nscd],
 410                [library functions will not contact the nscd daemon])],
 411               [use_nscd=$enableval],
 412               [use_nscd=yes])
 413
 414 AC_ARG_ENABLE([pt_chown],
 415               [AS_HELP_STRING([--enable-pt_chown],
 416                [Enable building and installing pt_chown])],
 417               [build_pt_chown=$enableval],
 418               [build_pt_chown=no])
 419 AC_SUBST(build_pt_chown)
 420 if test "$build_pt_chown" = yes; then
 421   AC_DEFINE(HAVE_PT_CHOWN)
 422 fi
 423
 424 AC_ARG_ENABLE([tunables],
 425               [AS_HELP_STRING([--enable-tunables],
 426                [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
 427               [have_tunables=$enableval],
 428               [have_tunables=no])
 429 AC_SUBST(have_tunables)
 430 if test "$have_tunables" = yes; then
 431   AC_DEFINE(HAVE_TUNABLES)
 432 fi
 433
 434 # The abi-tags file uses a fairly simplistic model for name recognition that
 435 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
 436 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
 437 # This doesn't get used much beyond that, so it's fairly safe.
 438 case "$host_os" in
 439 linux*)
 440   ;;
 441 gnu*)
 442   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 443   ;;
 444 esac
 445
 446 AC_ARG_ENABLE([mathvec],
 447               [AS_HELP_STRING([--enable-mathvec],
 448               [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
 449               [build_mathvec=$enableval],
 450               [build_mathvec=notset])
 451
 452 # We keep the original values in `$config_*' and never modify them, so we
 453 # can write them unchanged into config.make.  Everything else uses
 454 # $machine, $vendor, and $os, and changes them whenever convenient.
 455 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 456
 457 # Don't allow vendor == "unknown"
 458 test "$config_vendor" = unknown && config_vendor=
 459 config_os="`echo $config_os | sed 's/^unknown-//'`"
 460
 461 # Some configurations imply other options.
 462 elf=yes
 463
 464 # The configure fragment of an add-on port can modify these to supplement
 465 # or override the table in the case statement below.  No fragment should
 466 # ever change the config_* variables, however.
 467 machine=$config_machine
 468 vendor=$config_vendor
 469 os=$config_os
 470 base_os=''
 471
 472 submachine=
 473 AC_ARG_WITH([cpu],
 474             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 475             [dnl
 476   case "$withval" in
 477   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 478   no) ;;
 479   *) submachine="$withval" ;;
 480   esac
 481 ])
 482
 483 # An preconfigure script can set this when it wants to disable the sanity
 484 # check below.
 485 libc_config_ok=no
 486
 487 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
 488 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 489
 490 dnl Having this here, though empty, makes sure that if add-ons' fragments
 491 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
 492 dnl our AC_OUTPUT will actually use it.
 493 AC_CONFIG_SUBDIRS()
 494
 495 case "$enable_add_ons" in
 496 ''|no) add_ons= ;;
 497 yes|'*')
 498  add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
 499           sed 's@/[[^/]]*$@@' | sort | uniq`
 500          add_ons_automatic=yes
 501          ;;
 502 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
 503        add_ons_automatic=no ;;
 504 esac
 505
 506 configured_add_ons=
 507 add_ons_sfx=
 508 add_ons_pfx=
 509 if test x"$add_ons" != x; then
 510   for f in $add_ons; do
 511     # Some sanity checks
 512     case "$f" in
 513     crypt)
 514       AC_MSG_ERROR([
 515 *** It seems that you're using an old \`crypt' add-on.  crypt is now
 516 *** part of glibc and using the old add-on will not work with this
 517 *** release.  Start again with fresh sources and without the old
 518 *** \`crypt' add-on.])
 519     ;;
 520     localedata)
 521       AC_MSG_ERROR([
 522 *** It seems that you're using an old \`localedata' add-on.  localedata
 523 *** is now part of glibc and using the old add-on will not work with
 524 *** this release.  Start again with fresh sources and without the old
 525 *** \`localedata' add-on.])
 526     ;;
 527     esac
 528   done
 529
 530   # Now source each add-on's configure fragment.
 531   # The fragments can use $srcdir/$libc_add_on to find themselves,
 532   # and test $add_ons_automatic to see if they were explicitly requested.
 533   # A fragment can clear (or even change) $libc_add_on to affect
 534   # whether it goes into the list to be actually used in the build.
 535   use_add_ons=
 536   for libc_add_on in $add_ons; do
 537     # Test whether such a directory really exists.
 538     # It can be absolute, or relative to $srcdir, or relative to the build dir.
 539     case "$libc_add_on" in
 540     /*)
 541       libc_add_on_srcdir=$libc_add_on
 542       ;;
 543     *)
 544       test -d "$srcdir/$libc_add_on" || {
 545         if test -d "$libc_add_on"; then
 546           libc_add_on="`pwd`/$libc_add_on"
 547         else
 548           AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
 549         fi
 550       }
 551       libc_add_on_srcdir=$srcdir/$libc_add_on
 552       ;;
 553     esac
 554
 555     libc_add_on_frag=$libc_add_on_srcdir/configure
 556     libc_add_on_canonical=
 557     libc_add_on_config_subdirs=
 558     if test -r "$libc_add_on_frag"; then
 559       AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
 560       libc_add_on_canonical=unknown
 561       libc_add_on_subdirs=
 562       . "$libc_add_on_frag"
 563       test -z "$libc_add_on" || {
 564         configured_add_ons="$configured_add_ons $libc_add_on"
 565         if test "x$libc_add_on_canonical" = xunknown; then
 566           AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
 567         fi
 568         for d in $libc_add_on_subdirs; do
 569           case "$libc_add_on" in
 570           /*) subdir_srcdir="$libc_add_on" ;;
 571           *) subdir_srcdir="\$(..)$libc_add_on" ;;
 572           esac
 573           case "$d" in
 574           .)
 575             d="${libc_add_on_canonical:-$libc_add_on}"
 576             ;;
 577           /*)
 578             subdir_srcdir="$d"
 579             ;;
 580           *)
 581             subdir_srcdir="$subdir_srcdir/$d"
 582             ;;
 583           esac
 584           d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
 585           add_on_subdirs="$add_on_subdirs $d"
 586           test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
 587 $d-srcdir = $subdir_srcdir"
 588         done
 589         for d in $libc_add_on_config_subdirs; do
 590           case "$d" in
 591           /*) AC_MSG_ERROR(dnl
 592 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
 593           esac
 594           if test ! -d "$libc_add_on_srcdir/$d"; then
 595             AC_MSG_ERROR(fragment wants to configure missing directory $d)
 596           fi
 597           case "$libc_add_on" in
 598           /*) AC_MSG_ERROR(dnl
 599 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
 600           esac
 601           subdirs="$subdirs $libc_add_on/$d"
 602         done
 603       }
 604     fi
 605     if test -n "$libc_add_on"; then
 606       LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
 607       use_add_ons="$use_add_ons $libc_add_on"
 608       add_ons_pfx="$add_ons_pfx $libc_add_on/"
 609       test -z "$libc_add_on_canonical" ||
 610       add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
 611     fi
 612   done
 613   # Use echo to strip excess whitespace.
 614   add_ons="`echo $use_add_ons`"
 615 fi
 616 AC_SUBST(add_ons)
 617 AC_SUBST(add_on_subdirs)
 618
 619
 620 ###
 621 ### By using the undocumented --enable-hacker-mode option for configure
 622 ### one can skip this test to make the configuration not fail for unsupported
 623 ### platforms.
 624 ###
 625 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 626   case "$machine-$host_os" in
 627   *-linux* | *-gnu*)
 628     ;;
 629   *)
 630     AC_MSG_ERROR([
 631 *** The GNU C library is currently unavailable for this platform.
 632 *** If you are interested in seeing glibc on this platform visit
 633 *** the "How to submit a new port" in the wiki:
 634 ***   https://sourceware.org/glibc/wiki/#Development
 635 *** and join the community!])
 636     ;;
 637   esac
 638 fi
 639
 640 # Set base_machine if not set by a preconfigure fragment.
 641 test -n "$base_machine" || base_machine=$machine
 642 AC_SUBST(base_machine)
 643
 644 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
 645 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
 646                    [libc_cv_ssp=yes],
 647                    [libc_cv_ssp=no])
 648 ])
 649
 650 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
 651 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
 652                    [libc_cv_ssp_strong=yes],
 653                    [libc_cv_ssp_strong=no])
 654 ])
 655
 656 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
 657 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
 658                    [libc_cv_ssp_all=yes],
 659                    [libc_cv_ssp_all=no])
 660 ])
 661
 662 stack_protector=
 663 no_stack_protector=
 664 if test "$libc_cv_ssp" = yes; then
 665   no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
 666   AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
 667 fi
 668
 669 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
 670   stack_protector="-fstack-protector"
 671   AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
 672 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
 673   stack_protector="-fstack-protector-all"
 674   AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
 675 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
 676   stack_protector="-fstack-protector-strong"
 677   AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
 678 else
 679   stack_protector="-fno-stack-protector"
 680   AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
 681 fi
 682 AC_SUBST(libc_cv_ssp)
 683 AC_SUBST(stack_protector)
 684 AC_SUBST(no_stack_protector)
 685
 686 if test -n "$stack_protector"; then
 687   dnl Don't run configure tests with stack-protection on, to avoid problems with
 688   dnl bootstrapping.
 689   no_ssp=-fno-stack-protector
 690 else
 691   no_ssp=
 692
 693   if test "$enable_stack_protector" != no; then
 694     AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
 695   fi
 696 fi
 697
 698 # For the multi-arch option we need support in the assembler & linker.
 699 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 700                libc_cv_ld_gnu_indirect_function, [dnl
 701 cat > conftest.S <<EOF
 702 .type foo,%gnu_indirect_function
 703 foo:
 704 .globl _start
 705 _start:
 706 .globl __start
 707 __start:
 708 .data
 709 #ifdef _LP64
 710 .quad foo
 711 #else
 712 .long foo
 713 #endif
 714 EOF
 715 libc_cv_ld_gnu_indirect_function=no
 716 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
 717             -nostartfiles -nostdlib $no_ssp \
 718             -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
 719   # Do a link to see if the backend supports IFUNC relocs.
 720   $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
 721   LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
 722     libc_cv_ld_gnu_indirect_function=yes
 723   }
 724 fi
 725 rm -f conftest*])
 726
 727 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
 728 AC_CACHE_CHECK([for gcc attribute ifunc support],
 729                libc_cv_gcc_indirect_function, [dnl
 730 cat > conftest.c <<EOF
 731 extern int func (int);
 732 int used_func (int a)
 733 {
 734   return a;
 735 }
 736 static void *resolver ()
 737 {
 738   return &used_func;
 739 }
 740 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
 741 EOF
 742 libc_cv_gcc_indirect_function=no
 743 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
 744    2>&AS_MESSAGE_LOG_FD ; then
 745   if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
 746     libc_cv_gcc_indirect_function=yes
 747   fi
 748 fi
 749 rm -f conftest*])
 750
 751 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
 752   if test x"$multi_arch" = xyes; then
 753     AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
 754   else
 755     multi_arch=no
 756   fi
 757 fi
 758 if test x"$libc_cv_gcc_indirect_function" != xyes &&
 759    test x"$multi_arch" = xyes; then
 760   AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
 761 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
 762 fi
 763 multi_arch_d=
 764 if test x"$multi_arch" != xno; then
 765   multi_arch_d=/multiarch
 766 fi
 767
 768 # Compute the list of sysdep directories for this configuration.
 769 # This can take a while to compute.
 770 sysdep_dir=$srcdir/sysdeps
 771 AC_MSG_CHECKING(sysdep dirs)
 772 dnl We need to use [ and ] for other purposes for a while now.
 773 changequote(,)dnl
 774 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 775 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 776
 777 test "x$base_os" != x || case "$os" in
 778 gnu*)
 779   base_os=mach/hurd ;;
 780 linux*)
 781   base_os=unix/sysv ;;
 782 esac
 783
 784 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 785 tail=$os
 786 ostry=$os
 787 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 788   ostry="$ostry /$o"
 789   tail=$o
 790 done
 791 o=`echo $tail | sed 's/[0-9]*$//'`
 792 if test $o != $tail; then
 793   ostry="$ostry /$o"
 794 fi
 795 # For linux-gnu, try linux-gnu, then linux.
 796 o=`echo $tail | sed 's/-.*$//'`
 797 if test $o != $tail; then
 798   ostry="$ostry /$o"
 799 fi
 800
 801 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 802 base=
 803 tail=$base_os
 804 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 805   set $b
 806   base="$base /$1"
 807   tail="$2"
 808 done
 809
 810 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 811 mach=
 812 tail=$machine${submachine:+/$submachine}
 813 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 814   set $m
 815   # Prepend the machine's FPU directory unless --without-fp.
 816   if test "$with_fp" = yes; then
 817     maybe_fpu=/fpu
 818   else
 819     maybe_fpu=/nofpu
 820   fi
 821   # For each machine term, try it with and then without /multiarch.
 822   for try_fpu in $maybe_fpu ''; do
 823     for try_multi in $multi_arch_d ''; do
 824       mach="$mach /$1$try_fpu$try_multi"
 825     done
 826   done
 827   tail="$2"
 828 done
 829
 830 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 831 changequote([,])dnl
 832
 833 # Find what sysdep directories exist.
 834 sysnames_add_ons=
 835 sysnames=
 836 for b in $base ''; do
 837   for m0 in $mach ''; do
 838     for v in /$vendor ''; do
 839       test "$v" = / && continue
 840       for o in /$ostry ''; do
 841         test "$o" = / && continue
 842         for m in $mach ''; do
 843           for d in $add_ons_pfx ''; do
 844             for a in $add_ons_sfx ''; do
 845               try_suffix="$m0$b$v$o$m"
 846               if test -n "$try_suffix"; then
 847                 try_srcdir="${srcdir}/"
 848                 case "$d" in
 849                 /*) try_srcdir= ;;
 850                 esac
 851                 try="${d}sysdeps$try_suffix$a"
 852                 test -n "$enable_debug_configure" &&
 853                 echo "$0 [DEBUG]: try $try" >&2
 854                 if test -d "$try_srcdir$try"; then
 855                   sysnames="$sysnames $try"
 856                   { test -n "$o" || test -n "$b"; } && os_used=t
 857                   { test -n "$m" || test -n "$m0"; } && machine_used=t
 858                   case x${m0:-$m} in
 859                   x*/$submachine) submachine_used=t ;;
 860                   esac
 861                   if test -n "$d"; then
 862                     case "$sysnames_add_ons" in
 863                     *" $d "*) ;;
 864                     *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 865                     esac
 866                   fi
 867                 fi
 868               fi
 869             done
 870           done
 871         done
 872       done
 873     done
 874   done
 875 done
 876
 877 # If the assembler supports gnu_indirect_function symbol type and the
 878 # architecture supports multi-arch, we enable multi-arch by default.
 879 case $sysnames_add_ons$sysnames in
 880 *"$multi_arch_d"*)
 881   ;;
 882 *)
 883   test x"$multi_arch" = xdefault && multi_arch=no
 884   ;;
 885 esac
 886 if test x"$multi_arch" != xno; then
 887   AC_DEFINE(USE_MULTIARCH)
 888 fi
 889 AC_SUBST(multi_arch)
 890
 891 if test -z "$os_used" && test "$os" != none; then
 892   AC_MSG_ERROR(Operating system $os is not supported.)
 893 fi
 894 if test -z "$machine_used" && test "$machine" != none; then
 895   AC_MSG_ERROR(The $machine is not supported.)
 896 fi
 897 if test -z "$submachine_used" && test -n "$submachine"; then
 898   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 899 fi
 900 AC_SUBST(submachine)
 901
 902 # We have now validated the configuration.
 903
 904 # Expand the list of system names into a full list of directories
 905 # from each element's parent name and Implies file (if present).
 906 set $sysnames
 907 names=
 908 while test $# -gt 0; do
 909   name=$1
 910   shift
 911
 912   case " $names " in *" $name "*)
 913     # Already in the list.
 914     continue
 915   esac
 916
 917   # Report each name as we discover it, so there is no long pause in output.
 918   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 919
 920   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 921
 922   case $name in
 923     /*) xsrcdir= ;;
 924     *)  xsrcdir=$srcdir/ ;;
 925   esac
 926   test -n "$enable_debug_configure" &&
 927   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 928
 929   for implies_file in Implies Implies-before Implies-after; do
 930     implies_type=`echo $implies_file | sed s/-/_/`
 931     eval ${implies_type}=
 932     if test -f $xsrcdir$name/$implies_file; then
 933       # Collect more names from the `Implies' file (removing comments).
 934       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
 935       for x in $implied_candidate; do
 936         found=no
 937         if test -d $xsrcdir$name_base/$x; then
 938           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
 939           found=yes
 940         fi
 941         for d in $add_ons_pfx ''; do
 942           try="${d}sysdeps/$x"
 943           case $d in
 944            /*) try_srcdir= ;;
 945            *) try_srcdir=$srcdir/ ;;
 946           esac
 947           test -n "$enable_debug_configure" &&
 948            echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
 949           if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 950           then
 951             eval "${implies_type}=\"\$${implies_type} \$try\""
 952             found=yes
 953             case "$sysnames_add_ons" in
 954             *" $d "*) ;;
 955             *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 956             esac
 957           fi
 958         done
 959         if test $found = no; then
 960           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
 961         fi
 962       done
 963     fi
 964   done
 965
 966   # Add NAME to the list of names.
 967   names="$names $name"
 968
 969   # Find the parent of NAME, using the empty string if it has none.
 970 changequote(,)dnl
 971   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 972 changequote([,])dnl
 973
 974   test -n "$enable_debug_configure" &&
 975     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
 976 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
 977
 978   # Add the names implied by NAME, and NAME's parent (if it has one), to
 979   # the list of names to be processed (the argument list).  We prepend the
 980   # implied names to the list and append the parent.  We want implied
 981   # directories to come before further directories inferred from the
 982   # configuration components; this ensures that for sysv4, unix/common
 983   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 984   # after sysv4).
 985   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
 986   test -n "$sysnames" && set $sysnames
 987 done
 988
 989 # Add the default directories.
 990 default_sysnames="sysdeps/generic"
 991 sysnames="$names $default_sysnames"
 992 AC_SUBST(sysnames)
 993 # The other names were emitted during the scan.
 994 AC_MSG_RESULT($default_sysnames)
 995
 996 # Collect the list of add-ons that supply partial sysdeps trees.
 997 sysdeps_add_ons=
 998 for add_on in $add_ons; do
 999   case "$add_on" in
1000   /*) xsrcdir= ;;
1001   *) xsrcdir="$srcdir/" ;;
1002   esac
1003
1004   test -d "$xsrcdir$add_on/sysdeps" || {
1005     case "$configured_add_ons " in
1006     *" $add_on "*) ;;
1007     *|'')
1008       AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
1009       ;;
1010     esac
1011     continue
1012   }
1013
1014   sysdeps_add_ons="$sysdeps_add_ons $add_on"
1015   case "$sysnames_add_ons" in
1016   *" $add_on/ "*) ;;
1017   *|'')
1018     AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
1019     continue ;;
1020   esac
1021
1022   found=no
1023   for d in $sysnames; do
1024     case "$d" in
1025     $add_on/sysdeps/*) ;;
1026     *) continue ;;
1027     esac
1028     (cd "$xsrcdir$d" && for f in *[[!~]]; do
1029        case "$f" in
1030        sys|bits)
1031          for ff in $f/*.h; do
1032            test -d "$ff" || { test -e "$ff" && exit 88; }
1033          done
1034          ;;
1035        *)
1036          test -d "$f" || { test -e "$f" && exit 88; }
1037          ;;
1038        esac
1039      done)
1040     if test $? -eq 88; then
1041       found=yes
1042       break
1043     fi
1044   done
1045   if test $found = no; then
1046     AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
1047   fi
1048 done
1049 AC_SUBST(sysdeps_add_ons)
1050
1051
1052 ### Locate tools.
1053
1054 AC_PROG_INSTALL
1055 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
1056   # The makefiles need to use a different form to find it in $srcdir.
1057   INSTALL='\$(..)./scripts/install-sh -c'
1058 fi
1059 AC_PROG_LN_S
1060
1061 LIBC_PROG_BINUTILS
1062
1063 # Accept binutils 2.22 or newer.
1064 AC_CHECK_PROG_VER(AS, $AS, --version,
1065                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
1066                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1067                   AS=: critic_missing="$critic_missing as")
1068 AC_CHECK_PROG_VER(LD, $LD, --version,
1069                   [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
1070                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1071                   LD=: critic_missing="$critic_missing ld")
1072
1073 # These programs are version sensitive.
1074 AC_CHECK_TOOL_PREFIX
1075 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1076   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1077   [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1078
1079 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1080   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1081   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1082   MSGFMT=: aux_missing="$aux_missing msgfmt")
1083 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1084   [GNU texinfo.* \([0-9][0-9.]*\)],
1085   [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1086   MAKEINFO=: aux_missing="$aux_missing makeinfo")
1087 AC_CHECK_PROG_VER(SED, sed, --version,
1088   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1089   [3.0[2-9]*|3.[1-9]*|[4-9]*],
1090   SED=: aux_missing="$aux_missing sed")
1091 AC_CHECK_PROG_VER(AWK, gawk, --version,
1092   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1093   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1094
1095 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1096 AC_TRY_COMPILE([], [
1097 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
1098 #error insufficient compiler
1099 #endif],
1100                [libc_cv_compiler_ok=yes],
1101                [libc_cv_compiler_ok=no])])
1102 AS_IF([test $libc_cv_compiler_ok != yes],
1103       [critic_missing="$critic_missing compiler"])
1104
1105 AC_CHECK_TOOL(NM, nm, false)
1106
1107 if test "x$maintainer" = "xyes"; then
1108   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1109   case "x$AUTOCONF" in
1110   xno|x|x:) AUTOCONF=no ;;
1111   *)
1112     AC_CACHE_CHECK(dnl
1113   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1114     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1115       libc_cv_autoconf_works=yes
1116     else
1117       libc_cv_autoconf_works=no
1118     fi])
1119     test $libc_cv_autoconf_works = yes || AUTOCONF=no
1120     ;;
1121   esac
1122   if test "x$AUTOCONF" = xno; then
1123     aux_missing="$aux_missing autoconf"
1124   fi
1125 else
1126   AUTOCONF=no
1127 fi
1128
1129 # Check for python3 if available, or else python.
1130 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1131 case "x$PYTHON_PROG" in
1132 xno|x|x:) PYTHON_PROG=no ;;
1133 *) ;;
1134 esac
1135
1136 if test "x$PYTHON_PROG" = xno; then
1137   aux_missing="$aux_missing python"
1138 else
1139   PYTHON="$PYTHON_PROG -B"
1140   AC_SUBST(PYTHON)
1141 fi
1142
1143 test -n "$critic_missing" && AC_MSG_ERROR([
1144 *** These critical programs are missing or too old:$critic_missing
1145 *** Check the INSTALL file for required versions.])
1146
1147 test -n "$aux_missing" && AC_MSG_WARN([
1148 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1149 *** some features or tests will be disabled.
1150 *** Check the INSTALL file for required versions.])
1151
1152 # if using special system headers, find out the compiler's sekrit
1153 # header directory and add that to the list.  NOTE: Only does the right
1154 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
1155 if test -n "$sysheaders"; then
1156   SYSINCLUDES=-nostdinc
1157   for d in include include-fixed; do
1158     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1159     SYSINCLUDES="$SYSINCLUDES -isystem $i"
1160   done
1161   SYSINCLUDES="$SYSINCLUDES \
1162 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1163   if test -n "$CXX"; then
1164     CXX_SYSINCLUDES=
1165     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1166     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1167       test "x$cxxheaders" != x &&
1168       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1169     done
1170   fi
1171 fi
1172 AC_SUBST(SYSINCLUDES)
1173 AC_SUBST(CXX_SYSINCLUDES)
1174
1175 # Obtain some C++ header file paths.  This is used to make a local
1176 # copy of those headers in Makerules.
1177 if test -n "$CXX"; then
1178   find_cxx_header () {
1179     echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
1180   }
1181   CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1182   CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1183 fi
1184 AC_SUBST(CXX_CSTDLIB_HEADER)
1185 AC_SUBST(CXX_CMATH_HEADER)
1186
1187 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1188 # since this would lead to problems installing/building glibc.
1189 # LD_LIBRARY_PATH contains the current directory if one of the following
1190 # is true:
1191 # - one of the terminals (":" and ";") is the first or last sign
1192 # - two terminals occur directly after each other
1193 # - the path contains an element with a dot in it
1194 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1195 changequote(,)dnl
1196 case ${LD_LIBRARY_PATH} in
1197   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1198     ld_library_path_setting="contains current directory"
1199     ;;
1200   *)
1201     ld_library_path_setting="ok"
1202     ;;
1203 esac
1204 changequote([,])dnl
1205 AC_MSG_RESULT($ld_library_path_setting)
1206 if test "$ld_library_path_setting" != "ok"; then
1207 AC_MSG_ERROR([
1208 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1209 *** building glibc. Please change the environment variable
1210 *** and run configure again.])
1211 fi
1212
1213 AC_PATH_PROG(BASH_SHELL, bash, no)
1214
1215 AC_PATH_PROG(PERL, perl, no)
1216 if test "$PERL" != no &&
1217    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1218   PERL=no
1219 fi
1220 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1221              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1222 AC_CHECK_PROG_VER(BISON, bison, --version,
1223                   [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1224                   [2.7*|[3-9].*|[1-9][0-9]*],
1225                   BISON=no)
1226
1227 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1228 cat > conftest.s <<EOF
1229 .text
1230 foo:
1231 .set glibc_conftest_frobozz,foo
1232 .globl glibc_conftest_frobozz
1233 EOF
1234 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1235 # (but it doesn't work), so we must do a linking check to be sure.
1236 cat > conftest1.c <<\EOF
1237 extern int glibc_conftest_frobozz;
1238 void _start() { glibc_conftest_frobozz = 1; }
1239 EOF
1240 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1241             -nostartfiles -nostdlib $no_ssp \
1242             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1243   libc_cv_asm_set_directive=yes
1244 else
1245   libc_cv_asm_set_directive=no
1246 fi
1247 rm -f conftest*])
1248 if test $libc_cv_asm_set_directive = yes; then
1249   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1250 fi
1251
1252 AC_CACHE_CHECK(linker support for protected data symbol,
1253                libc_cv_protected_data,
1254                [cat > conftest.c <<EOF
1255                 int bar __attribute__ ((visibility ("protected"))) = 1;
1256 EOF
1257                 libc_cv_protected_data=no
1258                 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1259                   cat > conftest.c <<EOF
1260                   extern int bar;
1261                   int main (void) { return bar; }
1262 EOF
1263                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1264                     libc_cv_protected_data=yes
1265                   fi
1266                 fi
1267                 rm -f conftest.*
1268                ])
1269 AC_SUBST(libc_cv_protected_data)
1270
1271 AC_CACHE_CHECK(for broken __attribute__((alias())),
1272                libc_cv_broken_alias_attribute,
1273                [cat > conftest.c <<EOF
1274                extern int foo (int x) __asm ("xyzzy");
1275                int bar (int x) { return x; }
1276                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1277                extern int dfoo;
1278                extern __typeof (dfoo) dfoo __asm ("abccb");
1279                int dfoo = 1;
1280 EOF
1281                libc_cv_broken_alias_attribute=yes
1282                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1283                  if grep 'xyzzy' conftest.s >/dev/null &&
1284                     grep 'abccb' conftest.s >/dev/null; then
1285                    libc_cv_broken_alias_attribute=no
1286                  fi
1287                fi
1288                rm -f conftest.c conftest.s
1289                ])
1290 if test $libc_cv_broken_alias_attribute = yes; then
1291   AC_MSG_ERROR(working alias attribute support required)
1292 fi
1293
1294 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1295                libc_cv_have_sdata_section,
1296                [echo "int i;" > conftest.c
1297                 libc_cv_have_sdata_section=no
1298                 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1299                    | grep '\.sdata' >/dev/null; then
1300                   libc_cv_have_sdata_section=yes
1301                 fi
1302                 rm -f conftest.c conftest.so
1303                ])
1304 if test $libc_cv_have_sdata_section = yes; then
1305   AC_DEFINE(HAVE_SDATA_SECTION)
1306 fi
1307
1308 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1309                libc_cv_ctors_header, [dnl
1310   libc_cv_ctors_header=yes
1311   LIBC_TRY_LINK_STATIC([
1312 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1313 __attribute__ ((destructor))  void dtor (void) { asm (""); }
1314 ],
1315               [dnl
1316       AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1317         { gsub(/\@<:@ */, "@<:@") }
1318         $2 == ".ctors" || $2 == ".dtors" {
1319           size = strtonum("0x" $6)
1320           align = strtonum("0x" $NF)
1321           seen@<:@$2@:>@ = 1
1322           stub@<:@$2@:>@ = size == align * 2
1323         }
1324         END {
1325           ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1326           dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1327           exit ((ctors_ok && dtors_ok) ? 0 : 1)
1328         }
1329       '], [libc_cv_ctors_header=no])
1330     ], [dnl
1331       AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1332     ])
1333 ])
1334 if test $libc_cv_ctors_header = no; then
1335   AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1336 fi
1337
1338 AC_CACHE_CHECK(for libunwind-support in compiler,
1339                libc_cv_cc_with_libunwind, [
1340   cat > conftest.c <<EOF
1341 int main (void) { return 0; }
1342 EOF
1343   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1344      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1345     libc_cv_cc_with_libunwind=yes
1346   else
1347     libc_cv_cc_with_libunwind=no
1348   fi
1349   rm -f conftest*])
1350 AC_SUBST(libc_cv_cc_with_libunwind)
1351 if test $libc_cv_cc_with_libunwind = yes; then
1352   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1353 fi
1354
1355 ASFLAGS_config=
1356 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1357                libc_cv_as_noexecstack, [dnl
1358 cat > conftest.c <<EOF
1359 void foo (void) { }
1360 EOF
1361 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1362                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1363    && grep .note.GNU-stack conftest.s >/dev/null \
1364    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1365                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1366 then
1367   libc_cv_as_noexecstack=yes
1368 else
1369   libc_cv_as_noexecstack=no
1370 fi
1371 rm -f conftest*])
1372 if test $libc_cv_as_noexecstack = yes; then
1373   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1374 fi
1375 AC_SUBST(ASFLAGS_config)
1376
1377 AC_CACHE_CHECK(for -z combreloc,
1378                libc_cv_z_combreloc, [dnl
1379 cat > conftest.c <<EOF
1380 extern int bar (int);
1381 extern int mumble;
1382 int foo (void) { return bar (mumble); }
1383 EOF
1384 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1385                         -fPIC -shared $no_ssp -o conftest.so conftest.c
1386                         -nostdlib -nostartfiles
1387                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1388 then
1389 dnl The following test is a bit weak.  We must use a tool which can test
1390 dnl cross-platform since the gcc used can be a cross compiler.  Without
1391 dnl introducing new options this is not easily doable.  Instead use a tool
1392 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1393 dnl look for a section named .rel.dyn.
1394   if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1395     libc_cv_z_combreloc=yes
1396   else
1397     libc_cv_z_combreloc=no
1398   fi
1399 else
1400   libc_cv_z_combreloc=no
1401 fi
1402 rm -f conftest*])
1403 if test "$libc_cv_z_combreloc" = yes; then
1404   AC_DEFINE(HAVE_Z_COMBRELOC)
1405 fi
1406 AC_SUBST(libc_cv_z_combreloc)
1407
1408 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1409                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1410 AC_SUBST(libc_cv_z_execstack)
1411
1412 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1413 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1414 ])
1415
1416 AC_SUBST(libc_cv_fpie)
1417
1418 AC_CACHE_CHECK(for --hash-style option,
1419                libc_cv_hashstyle, [dnl
1420 cat > conftest.c <<EOF
1421 int _start (void) { return 42; }
1422 EOF
1423 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1424                             -fPIC -shared -o conftest.so conftest.c
1425                             -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1426 then
1427   libc_cv_hashstyle=yes
1428 else
1429   libc_cv_hashstyle=no
1430 fi
1431 rm -f conftest*])
1432 AC_SUBST(libc_cv_hashstyle)
1433
1434 # The linker's default -shared behavior is good enough if it
1435 # does these things that our custom linker scripts ensure that
1436 # all allocated NOTE sections come first.
1437 if test "$use_default_link" = default; then
1438   AC_CACHE_CHECK([for sufficient default -shared layout],
1439                   libc_cv_use_default_link, [dnl
1440   libc_cv_use_default_link=no
1441   cat > conftest.s <<\EOF
1442           .section .note.a,"a",%note
1443           .balign 4
1444           .long 4,4,9
1445           .string "GNU"
1446           .string "foo"
1447           .section .note.b,"a",%note
1448           .balign 4
1449           .long 4,4,9
1450           .string "GNU"
1451           .string "bar"
1452 EOF
1453   if AC_TRY_COMMAND([dnl
1454   ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1455        ac_try=`$READELF -S conftest.so | sed -n \
1456          ['${x;p;}
1457           s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
1458           t a
1459           b
1460           : a
1461           H']`
1462   then
1463     libc_seen_a=no libc_seen_b=no
1464     set -- $ac_try
1465     while test $# -ge 2 -a "$1" = NOTE; do
1466       case "$2" in
1467       .note.a) libc_seen_a=yes ;;
1468       .note.b) libc_seen_b=yes ;;
1469       esac
1470       shift 2
1471     done
1472     case "$libc_seen_a$libc_seen_b" in
1473     yesyes)
1474       libc_cv_use_default_link=yes
1475       ;;
1476     *)
1477       echo >&AS_MESSAGE_LOG_FD "\
1478 $libc_seen_a$libc_seen_b from:
1479 $ac_try"
1480       ;;
1481     esac
1482   fi
1483   rm -f conftest*])
1484   use_default_link=$libc_cv_use_default_link
1485 fi
1486
1487 AC_CACHE_CHECK(for GLOB_DAT reloc,
1488                libc_cv_has_glob_dat, [dnl
1489 cat > conftest.c <<EOF
1490 extern int mumble;
1491 int foo (void) { return mumble; }
1492 EOF
1493 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1494                         -fPIC -shared -o conftest.so conftest.c
1495                         -nostdlib -nostartfiles $no_ssp
1496                         1>&AS_MESSAGE_LOG_FD])
1497 then
1498 dnl look for GLOB_DAT relocation.
1499   if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1500     libc_cv_has_glob_dat=yes
1501   else
1502     libc_cv_has_glob_dat=no
1503   fi
1504 else
1505   libc_cv_has_glob_dat=no
1506 fi
1507 rm -f conftest*])
1508 AC_SUBST(libc_cv_has_glob_dat)
1509
1510 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1511 if libc_cv_output_format=`
1512 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1513 then
1514   :
1515 else
1516   libc_cv_output_format=
1517 fi
1518 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1519 AC_SUBST(libc_cv_output_format)
1520
1521 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1522 cat > conftest.c <<EOF
1523 int foo;
1524 EOF
1525 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1526                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1527 then
1528   libc_cv_fno_toplevel_reorder=yes
1529 else
1530   libc_cv_fno_toplevel_reorder=no
1531 fi
1532 rm -f conftest*])
1533 if test $libc_cv_fno_toplevel_reorder = yes; then
1534   fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1535 else
1536   fno_unit_at_a_time=-fno-unit-at-a-time
1537 fi
1538 AC_SUBST(fno_unit_at_a_time)
1539
1540 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1541 [dnl
1542 cat > conftest.c <<EOF
1543 __thread int i;
1544 void foo (void)
1545 {
1546   i = 10;
1547 }
1548 EOF
1549 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1550                    conftest.c 1>&AS_MESSAGE_LOG_FD])
1551 then
1552   libc_cv_mtls_dialect_gnu2=yes
1553 else
1554   libc_cv_mtls_dialect_gnu2=no
1555 fi
1556 rm -f conftest*])
1557 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1558 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1559
1560 AC_CACHE_CHECK(whether cc puts quotes around section names,
1561                libc_cv_have_section_quotes,
1562                [cat > conftest.c <<EOF
1563                 static const int foo
1564                 __attribute__ ((section ("bar"))) = 1;
1565 EOF
1566                 if ${CC-cc} -S conftest.c -o conftest.s; then
1567                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1568                     libc_cv_have_section_quotes=yes
1569                   else
1570                     libc_cv_have_section_quotes=no
1571                   fi
1572                 else
1573                   libc_cv_have_section_quotes=unknown
1574                 fi
1575                 rm -f conftest.{c,s}
1576                 ])
1577 if test $libc_cv_have_section_quotes = yes; then
1578   AC_DEFINE(HAVE_SECTION_QUOTES)
1579 fi
1580
1581 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1582 cat > conftest.c <<\EOF
1583 void zero (void *x)
1584 {
1585   __builtin_memset (x, 0, 1000);
1586 }
1587 EOF
1588 dnl
1589 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1590 then
1591   libc_cv_gcc_builtin_memset=no
1592 else
1593   libc_cv_gcc_builtin_memset=yes
1594 fi
1595 rm -f conftest* ])
1596 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1597   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1598 fi
1599
1600 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1601 cat > conftest.c <<\EOF
1602 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1603 char *foo (const char *a, const char *b)
1604 {
1605   return __builtin_strstr (a, b);
1606 }
1607 EOF
1608 dnl
1609 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1610 then
1611   libc_cv_gcc_builtin_redirection=yes
1612 else
1613   libc_cv_gcc_builtin_redirection=no
1614 fi
1615 rm -f conftest* ])
1616 if test "$libc_cv_gcc_builtin_redirection" = no; then
1617   AC_MSG_ERROR([support for the symbol redirection needed])
1618 fi
1619
1620 dnl Determine how to disable generation of FMA instructions.
1621 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1622                libc_cv_cc_nofma, [dnl
1623 libc_cv_cc_nofma=
1624 for opt in -ffp-contract=off -mno-fused-madd; do
1625   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1626 done])
1627 AC_SUBST(libc_cv_cc_nofma)
1628
1629 if test -n "$submachine"; then
1630   AC_CACHE_CHECK([for compiler option for CPU variant],
1631                  libc_cv_cc_submachine, [dnl
1632   libc_cv_cc_submachine=no
1633   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1634     LIBC_TRY_CC_OPTION([$opt], [
1635       libc_cv_cc_submachine="$opt"
1636       break], [])
1637   done])
1638   if test "x$libc_cv_cc_submachine" = xno; then
1639     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1640   fi
1641 fi
1642 AC_SUBST(libc_cv_cc_submachine)
1643
1644 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1645 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1646 cat > conftest.c <<EOF
1647 void
1648 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1649 foo (void) {}
1650 EOF
1651 libc_cv_cc_loop_to_function=no
1652 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1653 then
1654   libc_cv_cc_loop_to_function=yes
1655 fi
1656 rm -f conftest*])
1657 if test $libc_cv_cc_loop_to_function = yes; then
1658   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1659 fi
1660 AC_SUBST(libc_cv_cc_loop_to_function)
1661
1662 dnl Check whether we have the gd library available.
1663 AC_MSG_CHECKING(for libgd)
1664 if test "$with_gd" != "no"; then
1665   old_CFLAGS="$CFLAGS"
1666   CFLAGS="$CFLAGS $libgd_include"
1667   old_LDFLAGS="$LDFLAGS"
1668   LDFLAGS="$LDFLAGS $libgd_ldflags"
1669   old_LIBS="$LIBS"
1670   LIBS="$LIBS -lgd -lpng -lz -lm"
1671   AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1672   CFLAGS="$old_CFLAGS"
1673   LDFLAGS="$old_LDFLAGS"
1674   LIBS="$old_LIBS"
1675 else
1676   LIBGD=no
1677 fi
1678 AC_MSG_RESULT($LIBGD)
1679 AC_SUBST(LIBGD)
1680
1681 # SELinux detection
1682 if test x$with_selinux = xno ; then
1683   have_selinux=no;
1684 else
1685   # See if we have the SELinux library
1686   AC_CHECK_LIB(selinux, is_selinux_enabled,
1687                have_selinux=yes, have_selinux=no)
1688   if test x$with_selinux = xyes ; then
1689     if test x$have_selinux = xno ; then
1690       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1691     fi
1692   fi
1693 fi
1694 # Check if we're building with SELinux support.
1695 if test "x$have_selinux" = xyes; then
1696   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1697
1698   # See if we have the libaudit library
1699   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1700                have_libaudit=yes, have_libaudit=no)
1701   if test "x$have_libaudit" = xyes; then
1702     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1703   fi
1704   AC_SUBST(have_libaudit)
1705
1706   # See if we have the libcap library
1707   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1708   if test "x$have_libcap" = xyes; then
1709     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1710   fi
1711   AC_SUBST(have_libcap)
1712 fi
1713 AC_SUBST(have_selinux)
1714
1715 CPPUNDEFS=
1716 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1717 dnl Since we are building the implementations of the fortified functions here,
1718 dnl having the macro defined interacts very badly.
1719 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1720 [AC_TRY_COMPILE([], [
1721 #ifdef _FORTIFY_SOURCE
1722 # error bogon
1723 #endif],
1724                 [libc_cv_predef_fortify_source=no],
1725                 [libc_cv_predef_fortify_source=yes])])
1726 if test $libc_cv_predef_fortify_source = yes; then
1727   CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1728 fi
1729 AC_SUBST(CPPUNDEFS)
1730
1731 # Some linkers on some architectures support __ehdr_start but with
1732 # bugs.  Make sure usage of it does not create relocations in the
1733 # output (as the linker should resolve them all for us).
1734 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1735                libc_cv_ehdr_start, [
1736 old_CFLAGS="$CFLAGS"
1737 old_LDFLAGS="$LDFLAGS"
1738 old_LIBS="$LIBS"
1739 CFLAGS="$CFLAGS -fPIC"
1740 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1741 LIBS=
1742 AC_LINK_IFELSE([AC_LANG_SOURCE([
1743 typedef struct {
1744   char foo;
1745   long val;
1746 } Ehdr;
1747 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1748 long ehdr (void) { return __ehdr_start.val; }
1749 ])],
1750                [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1751                   libc_cv_ehdr_start=broken
1752                 else
1753                   libc_cv_ehdr_start=yes
1754                 fi], [libc_cv_ehdr_start=no])
1755 CFLAGS="$old_CFLAGS"
1756 LDFLAGS="$old_LDFLAGS"
1757 LIBS="$old_LIBS"
1758 ])
1759 if test "$libc_cv_ehdr_start" = yes; then
1760   AC_DEFINE([HAVE_EHDR_START])
1761 elif test "$libc_cv_ehdr_start" = broken; then
1762   AC_MSG_WARN([linker is broken -- you should upgrade])
1763 fi
1764
1765 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1766                libc_cv_builtin_trap, [dnl
1767 libc_cv_builtin_trap=no
1768 AC_TRY_COMPILE([], [__builtin_trap ()], [
1769 libc_undefs=`$NM -u conftest.o |
1770   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1771     2>&AS_MESSAGE_LOG_FD` || {
1772   AC_MSG_ERROR([confusing output from $NM -u])
1773 }
1774 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1775 if test -z "$libc_undefs"; then
1776   libc_cv_builtin_trap=yes
1777 fi])])
1778 if test $libc_cv_builtin_trap = yes; then
1779   AC_DEFINE([HAVE_BUILTIN_TRAP])
1780 fi
1781
1782 dnl C++ feature tests.
1783 AC_LANG_PUSH([C++])
1784
1785 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1786                libc_cv_cxx_thread_local, [
1787 old_CXXFLAGS="$CXXFLAGS"
1788 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1789 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1790 #include <thread>
1791
1792 // Compiler support.
1793 struct S
1794 {
1795   S ();
1796   ~S ();
1797 };
1798 thread_local S s;
1799 S * get () { return &s; }
1800
1801 // libstdc++ support.
1802 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1803 #error __cxa_thread_atexit_impl not supported
1804 #endif
1805 ])],
1806                [libc_cv_cxx_thread_local=yes],
1807                [libc_cv_cxx_thread_local=no])
1808 CXXFLAGS="$old_CXXFLAGS"
1809 ])
1810 AC_SUBST(libc_cv_cxx_thread_local)
1811
1812 AC_LANG_POP([C++])
1813 dnl End of C++ feature tests.
1814
1815 ### End of automated tests.
1816 ### Now run sysdeps configure fragments.
1817
1818 # They also can set these variables.
1819 use_ldconfig=no
1820 ldd_rewrite_script=no
1821 libc_cv_sysconfdir=$sysconfdir
1822 libc_cv_localstatedir=$localstatedir
1823 libc_cv_gcc_unwind_find_fde=no
1824 libc_cv_idn=no
1825
1826 # Iterate over all the sysdep directories we will use, running their
1827 # configure fragments.
1828 for dir in $sysnames; do
1829   case $dir in
1830     /*) dest=$dir ;;
1831     *)  dest=$srcdir/$dir ;;
1832   esac
1833   if test -r $dest/configure; then
1834     AC_MSG_RESULT(running configure fragment for $dir)
1835     . $dest/configure
1836   fi
1837 done
1838
1839 if test x"$build_mathvec" = xnotset; then
1840   build_mathvec=no
1841 fi
1842 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1843
1844 AC_SUBST(libc_extra_cflags)
1845 AC_SUBST(libc_extra_cppflags)
1846
1847 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1848   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1849 fi
1850 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1851
1852 # A sysdeps configure fragment can reset this if IFUNC is not actually
1853 # usable even though the assembler knows how to generate the symbol type.
1854 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1855   AC_DEFINE(HAVE_IFUNC)
1856 fi
1857
1858 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1859   AC_DEFINE(HAVE_GCC_IFUNC)
1860 fi
1861
1862 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1863 # configure fragment can override the value to prevent this AC_DEFINE.
1864 AC_SUBST(use_nscd)
1865 if test "x$use_nscd" != xno; then
1866   AC_DEFINE([USE_NSCD])
1867 fi
1868 if test "x$build_nscd" = xdefault; then
1869   build_nscd=$use_nscd
1870 fi
1871
1872 AC_SUBST(libc_cv_slibdir)
1873 AC_SUBST(libc_cv_rtlddir)
1874 AC_SUBST(libc_cv_complocaledir)
1875 AC_SUBST(libc_cv_sysconfdir)
1876 AC_SUBST(libc_cv_localstatedir)
1877 AC_SUBST(libc_cv_rootsbindir)
1878
1879 if test x$use_ldconfig = xyes; then
1880   AC_DEFINE(USE_LDCONFIG)
1881 fi
1882 AC_SUBST(use_ldconfig)
1883 AC_SUBST(ldd_rewrite_script)
1884
1885 AC_SUBST(static)
1886 AC_SUBST(shared)
1887
1888 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1889 [libc_cv_pic_default=yes
1890 cat > conftest.c <<EOF
1891 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1892 # error PIC is default.
1893 #endif
1894 EOF
1895 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1896   libc_cv_pic_default=no
1897 fi
1898 rm -f conftest.*])
1899 AC_SUBST(libc_cv_pic_default)
1900
1901 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1902 [libc_cv_pie_default=yes
1903 cat > conftest.c <<EOF
1904 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1905 # error PIE is default.
1906 #endif
1907 EOF
1908 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1909   libc_cv_pie_default=no
1910 fi
1911 rm -f conftest.*])
1912 AC_SUBST(libc_cv_pie_default)
1913
1914 AC_SUBST(profile)
1915 AC_SUBST(static_nss)
1916
1917 AC_SUBST(DEFINES)
1918
1919 dnl See sysdeps/mach/configure.ac for this variable.
1920 AC_SUBST(mach_interface_list)
1921
1922 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1923 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1924 AC_SUBST(VERSION)
1925 AC_SUBST(RELEASE)
1926
1927 AC_CONFIG_FILES([config.make Makefile])
1928 AC_CONFIG_COMMANDS([default],[[
1929 case $CONFIG_FILES in *config.make*)
1930 echo "$config_vars" >> config.make;;
1931 esac
1932 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1933 AC_OUTPUT