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)], [https://sourceware.org/bugzilla/],
   4   [glibc], [https://www.gnu.org/software/glibc/])
   5 AC_CONFIG_SRCDIR([include/features.h])
   6 AC_CONFIG_HEADERS([config.h])
   7 AC_CONFIG_AUX_DIR([scripts])
   8
   9 ACX_PKGVERSION([GNU libc])
  10 ACX_BUGURL([https://www.gnu.org/software/libc/bugs.html])
  11 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
  12                    [Package description])
  13 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
  14                    [Bug reporting address])
  15
  16 # Glibc should not depend on any header files
  17 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
  18   [m4_divert_text([DEFAULTS],
  19     [ac_includes_default='/* none */'])])
  20
  21 # We require GCC, and by default use its preprocessor.  Override AC_PROG_CPP
  22 # here to work around the Autoconf issue discussed in
  23 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
  24 AC_DEFUN([AC_PROG_CPP],
  25 [AC_REQUIRE([AC_PROG_CC])dnl
  26 AC_ARG_VAR([CPP],      [C preprocessor])dnl
  27 _AC_ARG_VAR_CPPFLAGS()dnl
  28 # On Suns, sometimes $CPP names a directory.
  29 if test -n "$CPP" && test -d "$CPP"; then
  30   CPP=
  31 fi
  32 if test -z "$CPP"; then
  33   CPP="$CC -E"
  34 fi
  35 AC_SUBST(CPP)dnl
  36 ])# AC_PROG_CPP
  37
  38 # We require GCC.  Override _AC_PROG_CC_C89 here to work around the Autoconf
  39 # issue discussed in
  40 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
  41 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
  42
  43 dnl This is here so we can set $subdirs directly based on configure fragments.
  44 AC_CONFIG_SUBDIRS()
  45
  46 AC_CANONICAL_HOST
  47
  48 AC_PROG_CC
  49 if test $host != $build; then
  50   AC_CHECK_PROGS(BUILD_CC, gcc cc)
  51 fi
  52 AC_SUBST(cross_compiling)
  53 AC_PROG_CPP
  54 AC_CHECK_TOOL(READELF, readelf, false)
  55
  56 # We need the C++ compiler only for testing.
  57 AC_PROG_CXX
  58 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
  59 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
  60 AC_LANG_PUSH([C++])
  61 # Default, dynamic case.
  62 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  63                [libc_cv_cxx_link_ok=yes],
  64                [libc_cv_cxx_link_ok=no])
  65 # Static case.
  66 old_LDFLAGS="$LDFLAGS"
  67 LDFLAGS="$LDFLAGS -static"
  68 AC_LINK_IFELSE([AC_LANG_SOURCE([
  69 #include <iostream>
  70
  71 int
  72 main()
  73 {
  74   std::cout << "Hello, world!";
  75   return 0;
  76 }
  77 ])],
  78                [],
  79                [libc_cv_cxx_link_ok=no])
  80 LDFLAGS="$old_LDFLAGS"
  81 AC_LANG_POP([C++])])
  82 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
  83
  84 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
  85   AC_MSG_ERROR([you must configure in a separate build directory])
  86 fi
  87
  88 # This will get text that should go into config.make.
  89 config_vars=
  90
  91 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  92 AC_ARG_WITH([gd],
  93             AC_HELP_STRING([--with-gd=DIR],
  94                            [find libgd include dir and library with prefix DIR]),
  95             [dnl
  96 case "$with_gd" in
  97 yes|''|no) ;;
  98 *) libgd_include="-I$withval/include"
  99    libgd_ldflags="-L$withval/lib" ;;
 100 esac
 101 ])
 102 AC_ARG_WITH([gd-include],
 103             AC_HELP_STRING([--with-gd-include=DIR],
 104                            [find libgd include files in DIR]),
 105             [dnl
 106 case "$with_gd_include" in
 107 ''|no) ;;
 108 *) libgd_include="-I$withval" ;;
 109 esac
 110 ])
 111 AC_ARG_WITH([gd-lib],
 112             AC_HELP_STRING([--with-gd-lib=DIR],
 113                            [find libgd library files in DIR]),
 114             [dnl
 115 case "$with_gd_lib" in
 116 ''|no) ;;
 117 *) libgd_ldflags="-L$withval" ;;
 118 esac
 119 ])
 120
 121 if test -n "$libgd_include"; then
 122   config_vars="$config_vars
 123 CFLAGS-memusagestat.c = $libgd_include"
 124 fi
 125 if test -n "$libgd_ldflags"; then
 126   config_vars="$config_vars
 127 libgd-LDFLAGS = $libgd_ldflags"
 128 fi
 129
 130 dnl Arguments to specify presence of other packages/features.
 131 AC_ARG_WITH([binutils],
 132             AC_HELP_STRING([--with-binutils=PATH],
 133                            [specify location of binutils (as and ld)]),
 134             [path_binutils=$withval],
 135             [path_binutils=''])
 136 AC_ARG_WITH([selinux],
 137             AC_HELP_STRING([--with-selinux],
 138                            [if building with SELinux support]),
 139             [with_selinux=$withval],
 140             [with_selinux=auto])
 141
 142 AC_ARG_WITH([headers],
 143             AC_HELP_STRING([--with-headers=PATH],
 144                            [location of system headers to use
 145                             (for example /usr/src/linux/include)
 146                             @<:@default=compiler default@:>@]),
 147             [sysheaders=$withval],
 148             [sysheaders=''])
 149 AC_SUBST(sysheaders)
 150
 151 AC_SUBST(use_default_link)
 152 AC_ARG_WITH([default-link],
 153             AC_HELP_STRING([--with-default-link],
 154                            [do not use explicit linker scripts]),
 155             [use_default_link=$withval],
 156             [use_default_link=default])
 157
 158 dnl Additional build flags injection.
 159 AC_ARG_WITH([nonshared-cflags],
 160             AC_HELP_STRING([--with-nonshared-cflags=CFLAGS],
 161                            [build nonshared libraries with additional CFLAGS]),
 162             [extra_nonshared_cflags=$withval],
 163             [extra_nonshared_cflags=])
 164 AC_SUBST(extra_nonshared_cflags)
 165
 166 AC_ARG_ENABLE([sanity-checks],
 167               AC_HELP_STRING([--disable-sanity-checks],
 168                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 169               [enable_sanity=$enableval],
 170               [enable_sanity=yes])
 171
 172 AC_ARG_ENABLE([shared],
 173               AC_HELP_STRING([--enable-shared],
 174                              [build shared library @<:@default=yes if GNU ld@:>@]),
 175               [shared=$enableval],
 176               [shared=yes])
 177 AC_ARG_ENABLE([profile],
 178               AC_HELP_STRING([--enable-profile],
 179                              [build profiled library @<:@default=no@:>@]),
 180               [profile=$enableval],
 181               [profile=no])
 182 AC_ARG_ENABLE([static-pie],
 183               AC_HELP_STRING([--enable-static-pie],
 184                              [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
 185               [static_pie=$enableval],
 186               [static_pie=no])
 187 AC_ARG_ENABLE([timezone-tools],
 188               AC_HELP_STRING([--disable-timezone-tools],
 189                              [do not install timezone tools @<:@default=install@:>@]),
 190               [enable_timezone_tools=$enableval],
 191               [enable_timezone_tools=yes])
 192 AC_SUBST(enable_timezone_tools)
 193
 194 AC_ARG_ENABLE([hardcoded-path-in-tests],
 195               AC_HELP_STRING([--enable-hardcoded-path-in-tests],
 196                              [hardcode newly built glibc path in tests @<:@default=no@:>@]),
 197               [hardcoded_path_in_tests=$enableval],
 198               [hardcoded_path_in_tests=no])
 199 AC_SUBST(hardcoded_path_in_tests)
 200
 201 AC_ARG_ENABLE([stackguard-randomization],
 202               AC_HELP_STRING([--enable-stackguard-randomization],
 203                              [initialize __stack_chk_guard canary with a random number at program start]),
 204               [enable_stackguard_randomize=$enableval],
 205               [enable_stackguard_randomize=no])
 206 if test "$enable_stackguard_randomize" = yes; then
 207   AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
 208 fi
 209
 210 AC_ARG_ENABLE([hidden-plt],
 211               AC_HELP_STRING([--disable-hidden-plt],
 212                              [do not hide internal function calls to avoid PLT]),
 213               [hidden=$enableval],
 214               [hidden=yes])
 215 if test "x$hidden" = xno; then
 216   AC_DEFINE(NO_HIDDEN)
 217 fi
 218
 219 AC_ARG_ENABLE([bind-now],
 220               AC_HELP_STRING([--enable-bind-now],
 221                              [disable lazy relocations in DSOs]),
 222               [bindnow=$enableval],
 223               [bindnow=no])
 224 AC_SUBST(bindnow)
 225 if test "x$bindnow" = xyes; then
 226   AC_DEFINE(BIND_NOW)
 227 fi
 228
 229 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
 230 dnl -fstack-protector-strong.
 231 AC_ARG_ENABLE([stack-protector],
 232               AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
 233                              [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
 234               [enable_stack_protector=$enableval],
 235               [enable_stack_protector=no])
 236 case "$enable_stack_protector" in
 237 all|yes|no|strong) ;;
 238 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
 239 esac
 240
 241 dnl On some platforms we cannot use dynamic loading.  We must provide
 242 dnl static NSS modules.
 243 AC_ARG_ENABLE([static-nss],
 244               AC_HELP_STRING([--enable-static-nss],
 245                              [build static NSS modules @<:@default=no@:>@]),
 246               [static_nss=$enableval],
 247               [static_nss=no])
 248 dnl Enable static NSS also if we build no shared objects.
 249 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 250   static_nss=yes
 251   AC_DEFINE(DO_STATIC_NSS)
 252 fi
 253
 254 AC_ARG_ENABLE([force-install],
 255               AC_HELP_STRING([--disable-force-install],
 256                              [don't force installation of files from this package, even if they are older than the installed files]),
 257               [force_install=$enableval],
 258               [force_install=yes])
 259 AC_SUBST(force_install)
 260
 261 AC_ARG_ENABLE([maintainer-mode],
 262               AC_HELP_STRING([--enable-maintainer-mode],
 263                              [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
 264               [maintainer=$enableval],
 265               [maintainer=no])
 266
 267 dnl On some platforms we allow dropping compatibility with all kernel
 268 dnl versions.
 269 AC_ARG_ENABLE([kernel],
 270               AC_HELP_STRING([--enable-kernel=VERSION],
 271                              [compile for compatibility with kernel not older than VERSION]),
 272               [minimum_kernel=$enableval],
 273               [])
 274 dnl Prevent unreasonable values.
 275 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 276   # Better nothing than this.
 277   minimum_kernel=""
 278 else
 279   if test "$minimum_kernel" = current; then
 280     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 281   fi
 282 fi
 283
 284 dnl For the development we sometimes want gcc to issue even more warnings.
 285 dnl This is not the default since many of the extra warnings are not
 286 dnl appropriate.
 287 AC_ARG_ENABLE([all-warnings],
 288               AC_HELP_STRING([--enable-all-warnings],
 289                              [enable all useful warnings gcc can issue]),
 290               [all_warnings=$enableval],
 291               [])
 292 AC_SUBST(all_warnings)
 293
 294 AC_ARG_ENABLE([werror],
 295               AC_HELP_STRING([--disable-werror],
 296                              [do not build with -Werror]),
 297               [enable_werror=$enableval],
 298               [enable_werror=yes])
 299 AC_SUBST(enable_werror)
 300
 301 AC_ARG_ENABLE([multi-arch],
 302               AC_HELP_STRING([--enable-multi-arch],
 303                              [enable single DSO with optimizations for multiple architectures]),
 304               [multi_arch=$enableval],
 305               [multi_arch=default])
 306
 307 AC_ARG_ENABLE([experimental-malloc],
 308               AC_HELP_STRING([--disable-experimental-malloc],
 309                              [disable experimental malloc features]),
 310               [experimental_malloc=$enableval],
 311               [experimental_malloc=yes])
 312 AC_SUBST(experimental_malloc)
 313
 314 AC_ARG_ENABLE([crypt],
 315               AC_HELP_STRING([--disable-crypt],
 316                              [do not build nor install the passphrase hashing library, libcrypt]),
 317               [build_crypt=$enableval],
 318               [build_crypt=yes])
 319 AC_SUBST(build_crypt)
 320
 321 AC_ARG_ENABLE([nss-crypt],
 322               AC_HELP_STRING([--enable-nss-crypt],
 323                              [enable libcrypt to use nss]),
 324               [nss_crypt=$enableval],
 325               [nss_crypt=no])
 326 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
 327   AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
 328   nss_crypt=no
 329 fi
 330 if test x$nss_crypt = xyes; then
 331   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 332   if test $? -ne 0; then
 333     AC_MSG_ERROR([cannot find include directory with nss-config])
 334   fi
 335   nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
 336   if test $? -ne 0; then
 337     AC_MSG_ERROR([cannot find include directory with nspr-config])
 338   fi
 339   old_CFLAGS="$CFLAGS"
 340   CFLAGS="$CFLAGS $nss_includes $nspr_includes"
 341   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 342 #include <hasht.h>
 343 #include <nsslowhash.h>
 344 void f (void) { NSSLOW_Init (); }])],
 345              libc_cv_nss_crypt=yes,
 346              AC_MSG_ERROR([
 347 cannot find NSS headers with lowlevel hash function interfaces]))
 348   old_LIBS="$LIBS"
 349   old_LDFLAGS="$LDFLAGS"
 350   LIBS="$LIBS -lfreebl3"
 351   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 352 #include <hasht.h>
 353 #include <nsslowhash.h>],
 354                                   [NSSLOW_Init();])],
 355                  libc_cv_nss_crypt=yes,
 356                  AC_MSG_ERROR([
 357 cannot link program using lowlevel NSS hash functions]))
 358   # Check to see if there is a static NSS cryptographic library.
 359   # If there isn't then we can't link anything with libcrypt.a,
 360   # and that might mean disabling some static tests.
 361   LDFLAGS="$LDFLAGS -static"
 362   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 363 #include <hasht.h>
 364 #include <nsslowhash.h>],
 365                                   [NSSLOW_Init();])],
 366                  libc_cv_static_nss_crypt=yes,
 367                  libc_cv_static_nss_crypt=no)
 368   LDFLAGS="$old_LDFLAGS"
 369   CFLAGS="$old_CFLAGS"
 370   LIBS="$old_LIBS"
 371 else
 372   libc_cv_nss_crypt=no
 373   libc_cv_static_nss_crypt=no
 374 fi
 375 AC_SUBST(libc_cv_nss_crypt)
 376 AC_SUBST(libc_cv_static_nss_crypt)
 377
 378
 379 AC_ARG_ENABLE([obsolete-rpc],
 380               AC_HELP_STRING([--enable-obsolete-rpc],
 381                              [build and install the obsolete RPC code for link-time usage]),
 382               [link_obsolete_rpc=$enableval],
 383               [link_obsolete_rpc=no])
 384 AC_SUBST(link_obsolete_rpc)
 385
 386 if test "$link_obsolete_rpc" = yes; then
 387   AC_DEFINE(LINK_OBSOLETE_RPC)
 388 fi
 389
 390 AC_ARG_ENABLE([obsolete-nsl],
 391               AC_HELP_STRING([--enable-obsolete-nsl],
 392                              [build and install the obsolete libnsl library and depending NSS modules]),
 393               [build_obsolete_nsl=$enableval],
 394               [build_obsolete_nsl=no])
 395 AC_SUBST(build_obsolete_nsl)
 396
 397 if test "$build_obsolete_nsl" = yes; then
 398   AC_DEFINE(LINK_OBSOLETE_NSL)
 399 fi
 400
 401 AC_ARG_ENABLE([systemtap],
 402               [AS_HELP_STRING([--enable-systemtap],
 403                [enable systemtap static probe points @<:@default=no@:>@])],
 404               [systemtap=$enableval],
 405               [systemtap=no])
 406 if test "x$systemtap" != xno; then
 407   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 408   old_CFLAGS="$CFLAGS"
 409   CFLAGS="-std=gnu11 $CFLAGS"
 410   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 411 void foo (int i, void *p)
 412 {
 413   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 414        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 415 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 416   CFLAGS="$old_CFLAGS"])
 417   if test $libc_cv_sdt = yes; then
 418     AC_DEFINE([USE_STAP_PROBE])
 419   elif test "x$systemtap" != xauto; then
 420     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 421   fi
 422 fi
 423
 424 AC_ARG_ENABLE([build-nscd],
 425               [AS_HELP_STRING([--disable-build-nscd],
 426                [disable building and installing the nscd daemon])],
 427               [build_nscd=$enableval],
 428               [build_nscd=default])
 429 AC_SUBST(build_nscd)
 430
 431 # Note the use of $use_nscd is near the bottom of the file.
 432 AC_ARG_ENABLE([nscd],
 433               [AS_HELP_STRING([--disable-nscd],
 434                [library functions will not contact the nscd daemon])],
 435               [use_nscd=$enableval],
 436               [use_nscd=yes])
 437
 438 AC_ARG_ENABLE([pt_chown],
 439               [AS_HELP_STRING([--enable-pt_chown],
 440                [Enable building and installing pt_chown])],
 441               [build_pt_chown=$enableval],
 442               [build_pt_chown=no])
 443 AC_SUBST(build_pt_chown)
 444 if test "$build_pt_chown" = yes; then
 445   AC_DEFINE(HAVE_PT_CHOWN)
 446 fi
 447
 448 AC_ARG_ENABLE([tunables],
 449               [AS_HELP_STRING([--enable-tunables],
 450                [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
 451               [have_tunables=$enableval],
 452               [have_tunables=yes])
 453 AC_SUBST(have_tunables)
 454 if test "$have_tunables" = yes; then
 455   AC_DEFINE(HAVE_TUNABLES)
 456 fi
 457
 458 # The abi-tags file uses a fairly simplistic model for name recognition that
 459 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
 460 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
 461 # This doesn't get used much beyond that, so it's fairly safe.
 462 case "$host_os" in
 463 linux*)
 464   ;;
 465 gnu*)
 466   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 467   ;;
 468 esac
 469
 470 AC_ARG_ENABLE([mathvec],
 471               [AS_HELP_STRING([--enable-mathvec],
 472               [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
 473               [build_mathvec=$enableval],
 474               [build_mathvec=notset])
 475
 476 AC_ARG_ENABLE([cet],
 477               AC_HELP_STRING([--enable-cet],
 478                              [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
 479               [enable_cet=$enableval],
 480               [enable_cet=no])
 481
 482 # We keep the original values in `$config_*' and never modify them, so we
 483 # can write them unchanged into config.make.  Everything else uses
 484 # $machine, $vendor, and $os, and changes them whenever convenient.
 485 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 486
 487 # Don't allow vendor == "unknown"
 488 test "$config_vendor" = unknown && config_vendor=
 489 config_os="`echo $config_os | sed 's/^unknown-//'`"
 490
 491 # Some configurations imply other options.
 492 elf=yes
 493
 494 # The configure fragment of a port can modify these to supplement
 495 # or override the table in the case statement below.  No fragment should
 496 # ever change the config_* variables, however.
 497 machine=$config_machine
 498 vendor=$config_vendor
 499 os=$config_os
 500 base_os=''
 501
 502 submachine=
 503 AC_ARG_WITH([cpu],
 504             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 505             [dnl
 506   case "$withval" in
 507   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 508   no) ;;
 509   *) submachine="$withval" ;;
 510   esac
 511 ])
 512
 513 # An preconfigure script can set this when it wants to disable the sanity
 514 # check below.
 515 libc_config_ok=no
 516
 517 # A preconfigure script for a system that may or may not use fpu
 518 # sysdeps directories sets this to a preprocessor conditional for
 519 # whether to use such directories.
 520 with_fp_cond=1
 521
 522 dnl Let sysdeps/*/preconfigure act here.
 523 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 524
 525
 526 ###
 527 ### By using the undocumented --enable-hacker-mode option for configure
 528 ### one can skip this test to make the configuration not fail for unsupported
 529 ### platforms.
 530 ###
 531 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 532   case "$machine-$host_os" in
 533   *-linux* | *-gnu*)
 534     ;;
 535   *)
 536     AC_MSG_ERROR([
 537 *** The GNU C library is currently unavailable for this platform.
 538 *** If you are interested in seeing glibc on this platform visit
 539 *** the "How to submit a new port" in the wiki:
 540 ***   https://sourceware.org/glibc/wiki/#Development
 541 *** and join the community!])
 542     ;;
 543   esac
 544 fi
 545
 546 # Set base_machine if not set by a preconfigure fragment.
 547 test -n "$base_machine" || base_machine=$machine
 548 AC_SUBST(base_machine)
 549
 550 # Determine whether to use fpu or nofpu sysdeps directories.
 551 AC_CACHE_CHECK([for use of fpu sysdeps directories],
 552                libc_cv_with_fp, [dnl
 553 cat > conftest.c <<EOF
 554 #if $with_fp_cond
 555 int dummy;
 556 #else
 557 # error "no hardware floating point"
 558 #endif
 559 EOF
 560 libc_cv_with_fp=no
 561 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
 562    1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
 563   libc_cv_with_fp=yes
 564 fi
 565 rm -f conftest*])
 566 AC_SUBST(libc_cv_with_fp)
 567
 568 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
 569 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
 570                    [libc_cv_ssp=yes],
 571                    [libc_cv_ssp=no])
 572 ])
 573
 574 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
 575 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
 576                    [libc_cv_ssp_strong=yes],
 577                    [libc_cv_ssp_strong=no])
 578 ])
 579
 580 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
 581 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
 582                    [libc_cv_ssp_all=yes],
 583                    [libc_cv_ssp_all=no])
 584 ])
 585
 586 stack_protector=
 587 no_stack_protector=
 588 if test "$libc_cv_ssp" = yes; then
 589   no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
 590   AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
 591 fi
 592
 593 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
 594   stack_protector="-fstack-protector"
 595   AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
 596 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
 597   stack_protector="-fstack-protector-all"
 598   AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
 599 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
 600   stack_protector="-fstack-protector-strong"
 601   AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
 602 else
 603   stack_protector="-fno-stack-protector"
 604   AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
 605 fi
 606 AC_SUBST(libc_cv_ssp)
 607 AC_SUBST(stack_protector)
 608 AC_SUBST(no_stack_protector)
 609
 610 if test -n "$stack_protector"; then
 611   dnl Don't run configure tests with stack-protection on, to avoid problems with
 612   dnl bootstrapping.
 613   no_ssp=-fno-stack-protector
 614 else
 615   no_ssp=
 616
 617   if test "$enable_stack_protector" != no; then
 618     AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
 619   fi
 620 fi
 621
 622 # For the multi-arch option we need support in the assembler & linker.
 623 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 624                libc_cv_ld_gnu_indirect_function, [dnl
 625 cat > conftest.S <<EOF
 626 .type foo,%gnu_indirect_function
 627 foo:
 628 .globl _start
 629 _start:
 630 .globl __start
 631 __start:
 632 .data
 633 #ifdef _LP64
 634 .quad foo
 635 #else
 636 .long foo
 637 #endif
 638 EOF
 639 libc_cv_ld_gnu_indirect_function=no
 640 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
 641             -nostartfiles -nostdlib $no_ssp \
 642             -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
 643   # Do a link to see if the backend supports IFUNC relocs.
 644   $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
 645   LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
 646     libc_cv_ld_gnu_indirect_function=yes
 647   }
 648 fi
 649 rm -f conftest*])
 650
 651 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
 652 AC_CACHE_CHECK([for gcc attribute ifunc support],
 653                libc_cv_gcc_indirect_function, [dnl
 654 cat > conftest.c <<EOF
 655 extern int func (int);
 656 int used_func (int a)
 657 {
 658   return a;
 659 }
 660 static void *resolver ()
 661 {
 662   return &used_func;
 663 }
 664 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
 665 EOF
 666 libc_cv_gcc_indirect_function=no
 667 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
 668    2>&AS_MESSAGE_LOG_FD ; then
 669   if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
 670     libc_cv_gcc_indirect_function=yes
 671   fi
 672 fi
 673 rm -f conftest*])
 674
 675 # Check if linker supports textrel relocation with ifunc (used on elf/tests).
 676 # Note that it relies on libc_cv_ld_gnu_indirect_function test above.
 677 AC_CACHE_CHECK([whether the linker supports textrels along with ifunc],
 678                libc_cv_textrel_ifunc, [dnl
 679 cat > conftest.S <<EOF
 680 .type foo,%gnu_indirect_function
 681 foo:
 682 .globl _start
 683 _start:
 684 .globl __start
 685 __start:
 686 .data
 687 #ifdef _LP64
 688 .quad foo
 689 #else
 690 .long foo
 691 #endif
 692 .text
 693 .globl address
 694 address:
 695 #ifdef _LP64
 696 .quad address
 697 #else
 698 .long address
 699 #endif
 700 EOF
 701 libc_cv_textrel_ifunc=no
 702 if test $libc_cv_ld_gnu_indirect_function = yes; then
 703    if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp -pie -o conftest conftest.S); then
 704      libc_cv_textrel_ifunc=yes
 705    fi
 706 fi
 707 rm -f conftest*])
 708 AC_SUBST(libc_cv_textrel_ifunc)
 709
 710 # Check if gcc warns about alias for function with incompatible types.
 711 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
 712                libc_cv_gcc_incompatible_alias, [dnl
 713 cat > conftest.c <<EOF
 714 int __redirect_foo (const void *s, int c);
 715
 716 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
 717 __typeof (__redirect_foo) *foo_impl (void)
 718 {
 719   return 0;
 720 }
 721
 722 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
 723 EOF
 724 libc_cv_gcc_incompatible_alias=yes
 725 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
 726   libc_cv_gcc_incompatible_alias=no
 727 fi
 728 rm -f conftest*])
 729
 730 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
 731   if test x"$multi_arch" = xyes; then
 732     AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
 733   else
 734     multi_arch=no
 735   fi
 736 fi
 737 if test x"$libc_cv_gcc_indirect_function" != xyes; then
 738   # GCC 8+ emits a warning for alias with incompatible types and it might
 739   # fail to build ifunc resolvers aliases to either weak or internal
 740   # symbols.  Disables multiarch build in this case.
 741   if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
 742     AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
 743     if test x"$multi_arch" = xyes; then
 744       AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
 745     fi
 746     AC_MSG_WARN([Multi-arch is disabled.])
 747     multi_arch=no
 748   elif test x"$multi_arch" = xyes; then
 749     AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
 750 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
 751   fi
 752 fi
 753 multi_arch_d=
 754 if test x"$multi_arch" != xno; then
 755   multi_arch_d=/multiarch
 756 fi
 757
 758 # Compute the list of sysdep directories for this configuration.
 759 # This can take a while to compute.
 760 sysdep_dir=$srcdir/sysdeps
 761 AC_MSG_CHECKING(sysdep dirs)
 762 dnl We need to use [ and ] for other purposes for a while now.
 763 changequote(,)dnl
 764 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 765 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 766
 767 test "x$base_os" != x || case "$os" in
 768 gnu*)
 769   base_os=mach/hurd ;;
 770 linux*)
 771   base_os=unix/sysv ;;
 772 esac
 773
 774 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 775 tail=$os
 776 ostry=$os
 777 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 778   ostry="$ostry /$o"
 779   tail=$o
 780 done
 781 o=`echo $tail | sed 's/[0-9]*$//'`
 782 if test $o != $tail; then
 783   ostry="$ostry /$o"
 784 fi
 785 # For linux-gnu, try linux-gnu, then linux.
 786 o=`echo $tail | sed 's/-.*$//'`
 787 if test $o != $tail; then
 788   ostry="$ostry /$o"
 789 fi
 790
 791 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 792 base=
 793 tail=$base_os
 794 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 795   set $b
 796   base="$base /$1"
 797   tail="$2"
 798 done
 799
 800 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 801 mach=
 802 tail=$machine${submachine:+/$submachine}
 803 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 804   set $m
 805   # Prepend the machine's FPU directory unless --without-fp.
 806   if test "$libc_cv_with_fp" = yes; then
 807     maybe_fpu=/fpu
 808   else
 809     maybe_fpu=/nofpu
 810   fi
 811   # For each machine term, try it with and then without /multiarch.
 812   for try_fpu in $maybe_fpu ''; do
 813     for try_multi in $multi_arch_d ''; do
 814       mach="$mach /$1$try_fpu$try_multi"
 815     done
 816   done
 817   tail="$2"
 818 done
 819
 820 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 821 changequote([,])dnl
 822
 823 # Find what sysdep directories exist.
 824 sysnames=
 825 for b in $base ''; do
 826   for m0 in $mach ''; do
 827     for v in /$vendor ''; do
 828       test "$v" = / && continue
 829       for o in /$ostry ''; do
 830         test "$o" = / && continue
 831         for m in $mach ''; do
 832           try_suffix="$m0$b$v$o$m"
 833           if test -n "$try_suffix"; then
 834             try_srcdir="${srcdir}/"
 835             try="sysdeps$try_suffix"
 836             test -n "$enable_debug_configure" &&
 837             echo "$0 [DEBUG]: try $try" >&2
 838             if test -d "$try_srcdir$try"; then
 839               sysnames="$sysnames $try"
 840               { test -n "$o" || test -n "$b"; } && os_used=t
 841               { test -n "$m" || test -n "$m0"; } && machine_used=t
 842               case x${m0:-$m} in
 843               x*/$submachine) submachine_used=t ;;
 844               esac
 845             fi
 846           fi
 847         done
 848       done
 849     done
 850   done
 851 done
 852
 853 # If the assembler supports gnu_indirect_function symbol type and the
 854 # architecture supports multi-arch, we enable multi-arch by default.
 855 case $sysnames in
 856 *"$multi_arch_d"*)
 857   ;;
 858 *)
 859   test x"$multi_arch" = xdefault && multi_arch=no
 860   ;;
 861 esac
 862 if test x"$multi_arch" != xno; then
 863   AC_DEFINE(USE_MULTIARCH)
 864 fi
 865 AC_SUBST(multi_arch)
 866
 867 if test -z "$os_used" && test "$os" != none; then
 868   AC_MSG_ERROR(Operating system $os is not supported.)
 869 fi
 870 if test -z "$machine_used" && test "$machine" != none; then
 871   AC_MSG_ERROR(The $machine is not supported.)
 872 fi
 873 if test -z "$submachine_used" && test -n "$submachine"; then
 874   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 875 fi
 876 AC_SUBST(submachine)
 877
 878 # We have now validated the configuration.
 879
 880 # Expand the list of system names into a full list of directories
 881 # from each element's parent name and Implies file (if present).
 882 set $sysnames
 883 names=
 884 while test $# -gt 0; do
 885   name=$1
 886   shift
 887
 888   case " $names " in *" $name "*)
 889     # Already in the list.
 890     continue
 891   esac
 892
 893   # Report each name as we discover it, so there is no long pause in output.
 894   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 895
 896   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 897
 898   case $name in
 899     /*) xsrcdir= ;;
 900     *)  xsrcdir=$srcdir/ ;;
 901   esac
 902   test -n "$enable_debug_configure" &&
 903   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 904
 905   for implies_file in Implies Implies-before Implies-after; do
 906     implies_type=`echo $implies_file | sed s/-/_/`
 907     eval ${implies_type}=
 908     if test -f $xsrcdir$name/$implies_file; then
 909       # Collect more names from the `Implies' file (removing comments).
 910       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
 911       for x in $implied_candidate; do
 912         found=no
 913         if test -d $xsrcdir$name_base/$x; then
 914           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
 915           found=yes
 916         fi
 917         try="sysdeps/$x"
 918         try_srcdir=$srcdir/
 919         test -n "$enable_debug_configure" &&
 920          echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
 921         if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 922         then
 923           eval "${implies_type}=\"\$${implies_type} \$try\""
 924           found=yes
 925         fi
 926         if test $found = no; then
 927           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
 928         fi
 929       done
 930     fi
 931   done
 932
 933   # Add NAME to the list of names.
 934   names="$names $name"
 935
 936   # Find the parent of NAME, using the empty string if it has none.
 937 changequote(,)dnl
 938   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 939 changequote([,])dnl
 940
 941   test -n "$enable_debug_configure" &&
 942     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
 943 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
 944
 945   # Add the names implied by NAME, and NAME's parent (if it has one), to
 946   # the list of names to be processed (the argument list).  We prepend the
 947   # implied names to the list and append the parent.  We want implied
 948   # directories to come before further directories inferred from the
 949   # configuration components; this ensures that for sysv4, unix/common
 950   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 951   # after sysv4).
 952   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
 953   test -n "$sysnames" && set $sysnames
 954 done
 955
 956 # Add the default directories.
 957 default_sysnames="sysdeps/generic"
 958 sysnames="$names $default_sysnames"
 959 AC_SUBST(sysnames)
 960 # The other names were emitted during the scan.
 961 AC_MSG_RESULT($default_sysnames)
 962
 963
 964 ### Locate tools.
 965
 966 AC_PROG_INSTALL
 967 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
 968   # The makefiles need to use a different form to find it in $srcdir.
 969   INSTALL='\$(..)./scripts/install-sh -c'
 970 fi
 971 AC_PROG_LN_S
 972
 973 LIBC_PROG_BINUTILS
 974
 975 # Accept binutils 2.25 or newer.
 976 AC_CHECK_PROG_VER(AS, $AS, --version,
 977                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
 978                   [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 979                   AS=: critic_missing="$critic_missing as")
 980
 981 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
 982   # Accept gold 1.14 or higher
 983   AC_CHECK_PROG_VER(LD, $LD, --version,
 984                     [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
 985                     [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
 986                     LD=: critic_missing="$critic_missing GNU gold")
 987 else
 988   AC_CHECK_PROG_VER(LD, $LD, --version,
 989                     [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 990                     [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 991                     LD=: critic_missing="$critic_missing GNU ld")
 992 fi
 993
 994 # These programs are version sensitive.
 995 AC_CHECK_TOOL_PREFIX
 996 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
 997   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
 998   [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
 999
1000 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1001   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1002   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1003   MSGFMT=: aux_missing="$aux_missing msgfmt")
1004 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1005   [GNU texinfo.* \([0-9][0-9.]*\)],
1006   [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1007   MAKEINFO=: aux_missing="$aux_missing makeinfo")
1008 AC_CHECK_PROG_VER(SED, sed, --version,
1009   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1010   [3.0[2-9]*|3.[1-9]*|[4-9]*],
1011   SED=: aux_missing="$aux_missing sed")
1012 AC_CHECK_PROG_VER(AWK, gawk, --version,
1013   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1014   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1015 AC_CHECK_PROG_VER(BISON, bison, --version,
1016   [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1017   [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
1018
1019 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1020 AC_TRY_COMPILE([], [
1021 #if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
1022 #error insufficient compiler
1023 #endif],
1024                [libc_cv_compiler_ok=yes],
1025                [libc_cv_compiler_ok=no])])
1026 AS_IF([test $libc_cv_compiler_ok != yes],
1027       [critic_missing="$critic_missing compiler"])
1028
1029 AC_CHECK_TOOL(NM, nm, false)
1030
1031 if test "x$maintainer" = "xyes"; then
1032   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1033   case "x$AUTOCONF" in
1034   xno|x|x:) AUTOCONF=no ;;
1035   *)
1036     AC_CACHE_CHECK(dnl
1037   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1038     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1039       libc_cv_autoconf_works=yes
1040     else
1041       libc_cv_autoconf_works=no
1042     fi])
1043     test $libc_cv_autoconf_works = yes || AUTOCONF=no
1044     ;;
1045   esac
1046   if test "x$AUTOCONF" = xno; then
1047     aux_missing="$aux_missing autoconf"
1048   fi
1049 else
1050   AUTOCONF=no
1051 fi
1052
1053 # Check for python3 if available, or else python.
1054 AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
1055   [Python \([0-9][0-9.]*\)],
1056   [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
1057   critic_missing="$critic_missing python")
1058 PYTHON="$PYTHON_PROG -B"
1059 AC_SUBST(PYTHON)
1060
1061 test -n "$critic_missing" && AC_MSG_ERROR([
1062 *** These critical programs are missing or too old:$critic_missing
1063 *** Check the INSTALL file for required versions.])
1064
1065 test -n "$aux_missing" && AC_MSG_WARN([
1066 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1067 *** some features or tests will be disabled.
1068 *** Check the INSTALL file for required versions.])
1069
1070 # if using special system headers, find out the compiler's sekrit
1071 # header directory and add that to the list.  NOTE: Only does the right
1072 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
1073 if test -n "$sysheaders"; then
1074   SYSINCLUDES=-nostdinc
1075   for d in include include-fixed; do
1076     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1077     SYSINCLUDES="$SYSINCLUDES -isystem $i"
1078   done
1079   SYSINCLUDES="$SYSINCLUDES \
1080 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1081   if test -n "$CXX"; then
1082     CXX_SYSINCLUDES=
1083     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1084     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1085       test "x$cxxheaders" != x &&
1086       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1087     done
1088   fi
1089 fi
1090 AC_SUBST(SYSINCLUDES)
1091 AC_SUBST(CXX_SYSINCLUDES)
1092
1093 # Obtain some C++ header file paths.  This is used to make a local
1094 # copy of those headers in Makerules.
1095 if test -n "$CXX"; then
1096   find_cxx_header () {
1097     echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1098          | sed -n "\,$1:,{s/:\$//;p}"
1099   }
1100   CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1101   CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1102   CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1103 fi
1104 AC_SUBST(CXX_CSTDLIB_HEADER)
1105 AC_SUBST(CXX_CMATH_HEADER)
1106 AC_SUBST(CXX_BITS_STD_ABS_H)
1107
1108 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1109 # since this would lead to problems installing/building glibc.
1110 # LD_LIBRARY_PATH contains the current directory if one of the following
1111 # is true:
1112 # - one of the terminals (":" and ";") is the first or last sign
1113 # - two terminals occur directly after each other
1114 # - the path contains an element with a dot in it
1115 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1116 changequote(,)dnl
1117 case ${LD_LIBRARY_PATH} in
1118   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1119     ld_library_path_setting="contains current directory"
1120     ;;
1121   *)
1122     ld_library_path_setting="ok"
1123     ;;
1124 esac
1125 changequote([,])dnl
1126 AC_MSG_RESULT($ld_library_path_setting)
1127 if test "$ld_library_path_setting" != "ok"; then
1128 AC_MSG_ERROR([
1129 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1130 *** building glibc. Please change the environment variable
1131 *** and run configure again.])
1132 fi
1133
1134 AC_PATH_PROG(BASH_SHELL, bash, no)
1135
1136 AC_PATH_PROG(PERL, perl, no)
1137 if test "$PERL" != no &&
1138    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1139   PERL=no
1140 fi
1141 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1142              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1143
1144 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1145 cat > conftest.s <<EOF
1146 .text
1147 foo:
1148 .set glibc_conftest_frobozz,foo
1149 .globl glibc_conftest_frobozz
1150 EOF
1151 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1152 # (but it doesn't work), so we must do a linking check to be sure.
1153 cat > conftest1.c <<\EOF
1154 extern int glibc_conftest_frobozz;
1155 void _start() { glibc_conftest_frobozz = 1; }
1156 EOF
1157 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1158             -nostartfiles -nostdlib $no_ssp \
1159             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1160   libc_cv_asm_set_directive=yes
1161 else
1162   libc_cv_asm_set_directive=no
1163 fi
1164 rm -f conftest*])
1165 if test $libc_cv_asm_set_directive = yes; then
1166   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1167 fi
1168
1169 AC_CACHE_CHECK(linker support for protected data symbol,
1170                libc_cv_protected_data,
1171                [cat > conftest.c <<EOF
1172                 int bar __attribute__ ((visibility ("protected"))) = 1;
1173 EOF
1174                 libc_cv_protected_data=no
1175                 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1176                   cat > conftest.c <<EOF
1177                   extern int bar;
1178                   int main (void) { return bar; }
1179 EOF
1180                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1181                     libc_cv_protected_data=yes
1182                   fi
1183                 fi
1184                 rm -f conftest.*
1185                ])
1186 AC_SUBST(libc_cv_protected_data)
1187
1188 AC_CACHE_CHECK(linker support for INSERT in linker script,
1189                libc_cv_insert,
1190                [cat > conftest.c <<EOF
1191                 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1192                 int test (void) { return bar; }
1193 EOF
1194                 cat > conftest.t <<EOF
1195                 SECTIONS
1196                 {
1197                   .bar : { *(.bar) }
1198                 }
1199                 INSERT AFTER .rela.dyn;
1200 EOF
1201                 libc_cv_insert=no
1202                 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1203                   libc_cv_insert=yes
1204                 fi
1205                 rm -f conftest.*
1206                ])
1207 AC_SUBST(libc_cv_insert)
1208
1209 AC_CACHE_CHECK(for broken __attribute__((alias())),
1210                libc_cv_broken_alias_attribute,
1211                [cat > conftest.c <<EOF
1212                extern int foo (int x) __asm ("xyzzy");
1213                int bar (int x) { return x; }
1214                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1215                extern int dfoo;
1216                extern __typeof (dfoo) dfoo __asm ("abccb");
1217                int dfoo = 1;
1218 EOF
1219                libc_cv_broken_alias_attribute=yes
1220                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1221                  if grep 'xyzzy' conftest.s >/dev/null &&
1222                     grep 'abccb' conftest.s >/dev/null; then
1223                    libc_cv_broken_alias_attribute=no
1224                  fi
1225                fi
1226                rm -f conftest.c conftest.s
1227                ])
1228 if test $libc_cv_broken_alias_attribute = yes; then
1229   AC_MSG_ERROR(working alias attribute support required)
1230 fi
1231
1232 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1233                libc_cv_have_sdata_section,
1234                [echo "int i;" > conftest.c
1235                 libc_cv_have_sdata_section=no
1236                 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1237                    | grep '\.sdata' >/dev/null; then
1238                   libc_cv_have_sdata_section=yes
1239                 fi
1240                 rm -f conftest.c conftest.so
1241                ])
1242 if test $libc_cv_have_sdata_section = yes; then
1243   AC_DEFINE(HAVE_SDATA_SECTION)
1244 fi
1245
1246 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1247                libc_cv_ctors_header, [dnl
1248   libc_cv_ctors_header=yes
1249   LIBC_TRY_LINK_STATIC([
1250 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1251 __attribute__ ((destructor))  void dtor (void) { asm (""); }
1252 ],
1253               [dnl
1254       AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1255         { gsub(/\@<:@ */, "@<:@") }
1256         $2 == ".ctors" || $2 == ".dtors" {
1257           size = strtonum("0x" $6)
1258           align = strtonum("0x" $NF)
1259           seen@<:@$2@:>@ = 1
1260           stub@<:@$2@:>@ = size == align * 2
1261         }
1262         END {
1263           ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1264           dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1265           exit ((ctors_ok && dtors_ok) ? 0 : 1)
1266         }
1267       '], [libc_cv_ctors_header=no])
1268     ], [dnl
1269       AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1270     ])
1271 ])
1272 if test $libc_cv_ctors_header = no; then
1273   AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1274 fi
1275
1276 AC_CACHE_CHECK(for libunwind-support in compiler,
1277                libc_cv_cc_with_libunwind, [
1278   cat > conftest.c <<EOF
1279 int main (void) { return 0; }
1280 EOF
1281   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1282      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1283     libc_cv_cc_with_libunwind=yes
1284   else
1285     libc_cv_cc_with_libunwind=no
1286   fi
1287   rm -f conftest*])
1288 AC_SUBST(libc_cv_cc_with_libunwind)
1289 if test $libc_cv_cc_with_libunwind = yes; then
1290   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1291 fi
1292
1293 ASFLAGS_config=
1294 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1295                libc_cv_as_noexecstack, [dnl
1296 cat > conftest.c <<EOF
1297 void foo (void) { }
1298 EOF
1299 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1300                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1301    && grep .note.GNU-stack conftest.s >/dev/null \
1302    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1303                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1304 then
1305   libc_cv_as_noexecstack=yes
1306 else
1307   libc_cv_as_noexecstack=no
1308 fi
1309 rm -f conftest*])
1310 if test $libc_cv_as_noexecstack = yes; then
1311   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1312 fi
1313 AC_SUBST(ASFLAGS_config)
1314
1315 AC_CACHE_CHECK(for -z combreloc,
1316                libc_cv_z_combreloc, [dnl
1317 cat > conftest.c <<EOF
1318 extern int bar (int);
1319 extern int mumble;
1320 int foo (void) { return bar (mumble); }
1321 EOF
1322 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1323                         -fPIC -shared $no_ssp -o conftest.so conftest.c
1324                         -nostdlib -nostartfiles
1325                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1326 then
1327 dnl The following test is a bit weak.  We must use a tool which can test
1328 dnl cross-platform since the gcc used can be a cross compiler.  Without
1329 dnl introducing new options this is not easily doable.  Instead use a tool
1330 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1331 dnl look for a section named .rel.dyn or .rela.dyn.
1332   if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1333     libc_cv_z_combreloc=yes
1334   else
1335     libc_cv_z_combreloc=no
1336   fi
1337 else
1338   libc_cv_z_combreloc=no
1339 fi
1340 rm -f conftest*])
1341 if test "$libc_cv_z_combreloc" = yes; then
1342   AC_DEFINE(HAVE_Z_COMBRELOC)
1343 fi
1344 AC_SUBST(libc_cv_z_combreloc)
1345
1346 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1347                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1348 AC_SUBST(libc_cv_z_execstack)
1349
1350 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1351                     [-Wl,--no-dynamic-linker],
1352                     [libc_cv_no_dynamic_linker=yes],
1353                     [libc_cv_no_dynamic_linker=no])
1354 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1355
1356 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1357 LIBC_TRY_CC_OPTION([-static-pie],
1358                    [libc_cv_static_pie=yes],
1359                    [libc_cv_static_pie=no])
1360 ])
1361 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1362
1363 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1364 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1365 ])
1366
1367 AC_SUBST(libc_cv_fpie)
1368
1369 AC_CACHE_CHECK(for --hash-style option,
1370                libc_cv_hashstyle, [dnl
1371 cat > conftest.c <<EOF
1372 int _start (void) { return 42; }
1373 EOF
1374 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1375                             -fPIC -shared -o conftest.so conftest.c
1376                             -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1377 then
1378   libc_cv_hashstyle=yes
1379 else
1380   libc_cv_hashstyle=no
1381 fi
1382 rm -f conftest*])
1383 AC_SUBST(libc_cv_hashstyle)
1384
1385 # The linker's default -shared behavior is good enough if it
1386 # does these things that our custom linker scripts ensure that
1387 # all allocated NOTE sections come first.
1388 if test "$use_default_link" = default; then
1389   AC_CACHE_CHECK([for sufficient default -shared layout],
1390                   libc_cv_use_default_link, [dnl
1391   libc_cv_use_default_link=no
1392   cat > conftest.s <<\EOF
1393           .section .note.a,"a",%note
1394           .balign 4
1395           .long 4,4,9
1396           .string "GNU"
1397           .string "foo"
1398           .section .note.b,"a",%note
1399           .balign 4
1400           .long 4,4,9
1401           .string "GNU"
1402           .string "bar"
1403 EOF
1404   if AC_TRY_COMMAND([dnl
1405   ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1406        ac_try=`$READELF -S conftest.so | sed -n \
1407          ['${x;p;}
1408           s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
1409           t a
1410           b
1411           : a
1412           H']`
1413   then
1414     libc_seen_a=no libc_seen_b=no
1415     set -- $ac_try
1416     while test $# -ge 2 -a "$1" = NOTE; do
1417       case "$2" in
1418       .note.a) libc_seen_a=yes ;;
1419       .note.b) libc_seen_b=yes ;;
1420       esac
1421       shift 2
1422     done
1423     case "$libc_seen_a$libc_seen_b" in
1424     yesyes)
1425       libc_cv_use_default_link=yes
1426       ;;
1427     *)
1428       echo >&AS_MESSAGE_LOG_FD "\
1429 $libc_seen_a$libc_seen_b from:
1430 $ac_try"
1431       ;;
1432     esac
1433   fi
1434   rm -f conftest*])
1435   use_default_link=$libc_cv_use_default_link
1436 fi
1437
1438 AC_CACHE_CHECK(for GLOB_DAT reloc,
1439                libc_cv_has_glob_dat, [dnl
1440 cat > conftest.c <<EOF
1441 extern int mumble;
1442 int foo (void) { return mumble; }
1443 EOF
1444 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1445                         -fPIC -shared -o conftest.so conftest.c
1446                         -nostdlib -nostartfiles $no_ssp
1447                         1>&AS_MESSAGE_LOG_FD])
1448 then
1449 dnl look for GLOB_DAT relocation.
1450   if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1451     libc_cv_has_glob_dat=yes
1452   else
1453     libc_cv_has_glob_dat=no
1454   fi
1455 else
1456   libc_cv_has_glob_dat=no
1457 fi
1458 rm -f conftest*])
1459 AC_SUBST(libc_cv_has_glob_dat)
1460
1461 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1462 if libc_cv_output_format=`
1463 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1464 then
1465   :
1466 else
1467   libc_cv_output_format=
1468 fi
1469 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1470 AC_SUBST(libc_cv_output_format)
1471
1472 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1473 cat > conftest.c <<EOF
1474 int foo;
1475 EOF
1476 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1477                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1478 then
1479   libc_cv_fno_toplevel_reorder=yes
1480 else
1481   libc_cv_fno_toplevel_reorder=no
1482 fi
1483 rm -f conftest*])
1484 if test $libc_cv_fno_toplevel_reorder = yes; then
1485   fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1486 else
1487   fno_unit_at_a_time=-fno-unit-at-a-time
1488 fi
1489 AC_SUBST(fno_unit_at_a_time)
1490
1491 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1492 [dnl
1493 cat > conftest.c <<EOF
1494 __thread int i;
1495 void foo (void)
1496 {
1497   i = 10;
1498 }
1499 EOF
1500 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1501                    conftest.c 1>&AS_MESSAGE_LOG_FD])
1502 then
1503   libc_cv_mtls_dialect_gnu2=yes
1504 else
1505   libc_cv_mtls_dialect_gnu2=no
1506 fi
1507 rm -f conftest*])
1508 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1509 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1510
1511 AC_CACHE_CHECK(whether cc puts quotes around section names,
1512                libc_cv_have_section_quotes,
1513                [cat > conftest.c <<EOF
1514                 static const int foo
1515                 __attribute__ ((section ("bar"))) = 1;
1516 EOF
1517                 if ${CC-cc} -S conftest.c -o conftest.s; then
1518                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1519                     libc_cv_have_section_quotes=yes
1520                   else
1521                     libc_cv_have_section_quotes=no
1522                   fi
1523                 else
1524                   libc_cv_have_section_quotes=unknown
1525                 fi
1526                 rm -f conftest.{c,s}
1527                 ])
1528 if test $libc_cv_have_section_quotes = yes; then
1529   AC_DEFINE(HAVE_SECTION_QUOTES)
1530 fi
1531
1532 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1533 cat > conftest.c <<\EOF
1534 void zero (void *x)
1535 {
1536   __builtin_memset (x, 0, 1000);
1537 }
1538 EOF
1539 dnl
1540 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1541 then
1542   libc_cv_gcc_builtin_memset=no
1543 else
1544   libc_cv_gcc_builtin_memset=yes
1545 fi
1546 rm -f conftest* ])
1547 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1548   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1549 fi
1550
1551 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1552 cat > conftest.c <<\EOF
1553 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1554 char *foo (const char *a, const char *b)
1555 {
1556   return __builtin_strstr (a, b);
1557 }
1558 EOF
1559 dnl
1560 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1561 then
1562   libc_cv_gcc_builtin_redirection=yes
1563 else
1564   libc_cv_gcc_builtin_redirection=no
1565 fi
1566 rm -f conftest* ])
1567 if test "$libc_cv_gcc_builtin_redirection" = no; then
1568   AC_MSG_ERROR([support for the symbol redirection needed])
1569 fi
1570
1571 dnl Determine how to disable generation of FMA instructions.
1572 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1573                libc_cv_cc_nofma, [dnl
1574 libc_cv_cc_nofma=
1575 for opt in -ffp-contract=off -mno-fused-madd; do
1576   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1577 done])
1578 AC_SUBST(libc_cv_cc_nofma)
1579
1580 if test -n "$submachine"; then
1581   AC_CACHE_CHECK([for compiler option for CPU variant],
1582                  libc_cv_cc_submachine, [dnl
1583   libc_cv_cc_submachine=no
1584   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1585     LIBC_TRY_CC_OPTION([$opt], [
1586       libc_cv_cc_submachine="$opt"
1587       break], [])
1588   done])
1589   if test "x$libc_cv_cc_submachine" = xno; then
1590     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1591   fi
1592 fi
1593 AC_SUBST(libc_cv_cc_submachine)
1594
1595 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1596 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1597 cat > conftest.c <<EOF
1598 void
1599 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1600 foo (void) {}
1601 EOF
1602 libc_cv_cc_loop_to_function=no
1603 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1604 then
1605   libc_cv_cc_loop_to_function=yes
1606 fi
1607 rm -f conftest*])
1608 if test $libc_cv_cc_loop_to_function = yes; then
1609   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1610 fi
1611 AC_SUBST(libc_cv_cc_loop_to_function)
1612
1613 dnl Check whether we have the gd library available.
1614 AC_MSG_CHECKING(for libgd)
1615 if test "$with_gd" != "no"; then
1616   old_CFLAGS="$CFLAGS"
1617   CFLAGS="$CFLAGS $libgd_include"
1618   old_LDFLAGS="$LDFLAGS"
1619   LDFLAGS="$LDFLAGS $libgd_ldflags"
1620   old_LIBS="$LIBS"
1621   LIBS="$LIBS -lgd -lpng -lz -lm"
1622   AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1623   CFLAGS="$old_CFLAGS"
1624   LDFLAGS="$old_LDFLAGS"
1625   LIBS="$old_LIBS"
1626 else
1627   LIBGD=no
1628 fi
1629 AC_MSG_RESULT($LIBGD)
1630 AC_SUBST(LIBGD)
1631
1632 # SELinux detection
1633 if test x$with_selinux = xno ; then
1634   have_selinux=no;
1635 else
1636   # See if we have the SELinux library
1637   AC_CHECK_LIB(selinux, is_selinux_enabled,
1638                have_selinux=yes, have_selinux=no)
1639   if test x$with_selinux = xyes ; then
1640     if test x$have_selinux = xno ; then
1641       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1642     fi
1643   fi
1644 fi
1645 # Check if we're building with SELinux support.
1646 if test "x$have_selinux" = xyes; then
1647   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1648
1649   # See if we have the libaudit library
1650   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1651                have_libaudit=yes, have_libaudit=no)
1652   if test "x$have_libaudit" = xyes; then
1653     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1654   fi
1655   AC_SUBST(have_libaudit)
1656
1657   # See if we have the libcap library
1658   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1659   if test "x$have_libcap" = xyes; then
1660     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1661   fi
1662   AC_SUBST(have_libcap)
1663 fi
1664 AC_SUBST(have_selinux)
1665
1666 CPPUNDEFS=
1667 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1668 dnl Since we are building the implementations of the fortified functions here,
1669 dnl having the macro defined interacts very badly.
1670 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1671 [AC_TRY_COMPILE([], [
1672 #ifdef _FORTIFY_SOURCE
1673 # error bogon
1674 #endif],
1675                 [libc_cv_predef_fortify_source=no],
1676                 [libc_cv_predef_fortify_source=yes])])
1677 if test $libc_cv_predef_fortify_source = yes; then
1678   CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1679 fi
1680 AC_SUBST(CPPUNDEFS)
1681
1682 # Some linkers on some architectures support __ehdr_start but with
1683 # bugs.  Make sure usage of it does not create relocations in the
1684 # output (as the linker should resolve them all for us).
1685 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1686                libc_cv_ehdr_start, [
1687 old_CFLAGS="$CFLAGS"
1688 old_LDFLAGS="$LDFLAGS"
1689 old_LIBS="$LIBS"
1690 CFLAGS="$CFLAGS -fPIC"
1691 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1692 LIBS=
1693 AC_LINK_IFELSE([AC_LANG_SOURCE([
1694 typedef struct {
1695   char foo;
1696   long val;
1697 } Ehdr;
1698 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1699 long ehdr (void) { return __ehdr_start.val; }
1700 ])],
1701                [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1702                   libc_cv_ehdr_start=broken
1703                 else
1704                   libc_cv_ehdr_start=yes
1705                 fi], [libc_cv_ehdr_start=no])
1706 CFLAGS="$old_CFLAGS"
1707 LDFLAGS="$old_LDFLAGS"
1708 LIBS="$old_LIBS"
1709 ])
1710 if test "$libc_cv_ehdr_start" = yes; then
1711   AC_DEFINE([HAVE_EHDR_START])
1712 elif test "$libc_cv_ehdr_start" = broken; then
1713   AC_MSG_WARN([linker is broken -- you should upgrade])
1714 fi
1715
1716 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1717                libc_cv_builtin_trap, [dnl
1718 libc_cv_builtin_trap=no
1719 AC_TRY_COMPILE([], [__builtin_trap ()], [
1720 libc_undefs=`$NM -u conftest.o |
1721   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1722     2>&AS_MESSAGE_LOG_FD` || {
1723   AC_MSG_ERROR([confusing output from $NM -u])
1724 }
1725 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1726 if test -z "$libc_undefs"; then
1727   libc_cv_builtin_trap=yes
1728 fi])])
1729 if test $libc_cv_builtin_trap = yes; then
1730   AC_DEFINE([HAVE_BUILTIN_TRAP])
1731 fi
1732
1733 dnl C++ feature tests.
1734 AC_LANG_PUSH([C++])
1735
1736 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1737                libc_cv_cxx_thread_local, [
1738 old_CXXFLAGS="$CXXFLAGS"
1739 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1740 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1741 #include <thread>
1742
1743 // Compiler support.
1744 struct S
1745 {
1746   S ();
1747   ~S ();
1748 };
1749 thread_local S s;
1750 S * get () { return &s; }
1751
1752 // libstdc++ support.
1753 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1754 #error __cxa_thread_atexit_impl not supported
1755 #endif
1756 ])],
1757                [libc_cv_cxx_thread_local=yes],
1758                [libc_cv_cxx_thread_local=no])
1759 CXXFLAGS="$old_CXXFLAGS"
1760 ])
1761 AC_SUBST(libc_cv_cxx_thread_local)
1762
1763 AC_LANG_POP([C++])
1764 dnl End of C++ feature tests.
1765
1766 ### End of automated tests.
1767 ### Now run sysdeps configure fragments.
1768
1769 # They also can set these variables.
1770 use_ldconfig=no
1771 ldd_rewrite_script=no
1772 libc_cv_sysconfdir=$sysconfdir
1773 libc_cv_localstatedir=$localstatedir
1774 libc_cv_gcc_unwind_find_fde=no
1775 libc_cv_idn=no
1776
1777 # Iterate over all the sysdep directories we will use, running their
1778 # configure fragments.
1779 for dir in $sysnames; do
1780   case $dir in
1781     /*) dest=$dir ;;
1782     *)  dest=$srcdir/$dir ;;
1783   esac
1784   if test -r $dest/configure; then
1785     AC_MSG_RESULT(running configure fragment for $dir)
1786     . $dest/configure
1787   fi
1788 done
1789
1790 if test x"$build_mathvec" = xnotset; then
1791   build_mathvec=no
1792 fi
1793 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1794
1795 AC_SUBST(libc_extra_cflags)
1796 AC_SUBST(libc_extra_cppflags)
1797
1798 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1799   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1800 fi
1801 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1802
1803 # A sysdeps configure fragment can reset this if IFUNC is not actually
1804 # usable even though the assembler knows how to generate the symbol type.
1805 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1806   AC_DEFINE(HAVE_IFUNC)
1807 fi
1808 LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
1809
1810 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1811   AC_DEFINE(HAVE_GCC_IFUNC)
1812 fi
1813
1814 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1815 # configure fragment can override the value to prevent this AC_DEFINE.
1816 AC_SUBST(use_nscd)
1817 if test "x$use_nscd" != xno; then
1818   AC_DEFINE([USE_NSCD])
1819 fi
1820 if test "x$build_nscd" = xdefault; then
1821   build_nscd=$use_nscd
1822 fi
1823
1824 AC_SUBST(libc_cv_slibdir)
1825 AC_SUBST(libc_cv_rtlddir)
1826 AC_SUBST(libc_cv_complocaledir)
1827 AC_SUBST(libc_cv_sysconfdir)
1828 AC_SUBST(libc_cv_localstatedir)
1829 AC_SUBST(libc_cv_rootsbindir)
1830
1831 if test x$use_ldconfig = xyes; then
1832   AC_DEFINE(USE_LDCONFIG)
1833 fi
1834 AC_SUBST(use_ldconfig)
1835 AC_SUBST(ldd_rewrite_script)
1836
1837 AC_SUBST(static)
1838 AC_SUBST(shared)
1839
1840 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1841 [libc_cv_pic_default=yes
1842 cat > conftest.c <<EOF
1843 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1844 # error PIC is default.
1845 #endif
1846 EOF
1847 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1848   libc_cv_pic_default=no
1849 fi
1850 rm -f conftest.*])
1851 AC_SUBST(libc_cv_pic_default)
1852
1853 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1854 [libc_cv_cc_pie_default=yes
1855 cat > conftest.c <<EOF
1856 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1857 # error PIE is default.
1858 #endif
1859 EOF
1860 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1861   libc_cv_cc_pie_default=no
1862 fi
1863 rm -f conftest.*])
1864 libc_cv_pie_default=$libc_cv_cc_pie_default
1865 AC_SUBST(libc_cv_cc_pie_default)
1866 AC_SUBST(libc_cv_pie_default)
1867
1868 # Set the `multidir' variable by grabbing the variable from the compiler.
1869 # We do it once and save the result in a generated makefile.
1870 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1871 AC_SUBST(libc_cv_multidir)
1872
1873 if test "$static_pie" = yes; then
1874   # The linker must support --no-dynamic-linker.
1875   if test "$libc_cv_no_dynamic_linker" != yes; then
1876     AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1877   fi
1878   # Default to PIE.
1879   libc_cv_pie_default=yes
1880   AC_DEFINE(ENABLE_STATIC_PIE)
1881 fi
1882 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1883
1884 AC_SUBST(profile)
1885 AC_SUBST(static_nss)
1886
1887 AC_SUBST(DEFINES)
1888
1889 dnl See sysdeps/mach/configure.ac for this variable.
1890 AC_SUBST(mach_interface_list)
1891
1892 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1893 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1894 AC_SUBST(VERSION)
1895 AC_SUBST(RELEASE)
1896
1897 AC_CONFIG_FILES([config.make Makefile])
1898 AC_CONFIG_COMMANDS([default],[[
1899 case $CONFIG_FILES in *config.make*)
1900 echo "$config_vars" >> config.make;;
1901 esac
1902 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1903 AC_OUTPUT