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([memory-tagging],
 315               AC_HELP_STRING([--enable-memory-tagging],
 316                              [enable memory tagging if supported by the architecture @<:@default=no@:>@]),
 317               [memory_tagging=$enableval],
 318               [memory_tagging=no])
 319 if test "$memory_tagging" = yes; then
 320   # Only enable this on architectures that support it.
 321   case $host_cpu in
 322     aarch64)
 323       AC_DEFINE(USE_MTAG)
 324       ;;
 325   esac
 326 fi
 327 AC_SUBST(memory_tagging)
 328
 329 AC_ARG_ENABLE([crypt],
 330               AC_HELP_STRING([--disable-crypt],
 331                              [do not build nor install the passphrase hashing library, libcrypt]),
 332               [build_crypt=$enableval],
 333               [build_crypt=yes])
 334 AC_SUBST(build_crypt)
 335
 336 AC_ARG_ENABLE([nss-crypt],
 337               AC_HELP_STRING([--enable-nss-crypt],
 338                              [enable libcrypt to use nss]),
 339               [nss_crypt=$enableval],
 340               [nss_crypt=no])
 341 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
 342   AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
 343   nss_crypt=no
 344 fi
 345 if test x$nss_crypt = xyes; then
 346   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 347   if test $? -ne 0; then
 348     AC_MSG_ERROR([cannot find include directory with nss-config])
 349   fi
 350   nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
 351   if test $? -ne 0; then
 352     AC_MSG_ERROR([cannot find include directory with nspr-config])
 353   fi
 354   old_CFLAGS="$CFLAGS"
 355   CFLAGS="$CFLAGS $nss_includes $nspr_includes"
 356   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 357 #include <hasht.h>
 358 #include <nsslowhash.h>
 359 void f (void) { NSSLOW_Init (); }])],
 360              libc_cv_nss_crypt=yes,
 361              AC_MSG_ERROR([
 362 cannot find NSS headers with lowlevel hash function interfaces]))
 363   old_LIBS="$LIBS"
 364   old_LDFLAGS="$LDFLAGS"
 365   LIBS="$LIBS -lfreebl3"
 366   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 367 #include <hasht.h>
 368 #include <nsslowhash.h>],
 369                                   [NSSLOW_Init();])],
 370                  libc_cv_nss_crypt=yes,
 371                  AC_MSG_ERROR([
 372 cannot link program using lowlevel NSS hash functions]))
 373   # Check to see if there is a static NSS cryptographic library.
 374   # If there isn't then we can't link anything with libcrypt.a,
 375   # and that might mean disabling some static tests.
 376   LDFLAGS="$LDFLAGS -static"
 377   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 378 #include <hasht.h>
 379 #include <nsslowhash.h>],
 380                                   [NSSLOW_Init();])],
 381                  libc_cv_static_nss_crypt=yes,
 382                  libc_cv_static_nss_crypt=no)
 383   LDFLAGS="$old_LDFLAGS"
 384   CFLAGS="$old_CFLAGS"
 385   LIBS="$old_LIBS"
 386 else
 387   libc_cv_nss_crypt=no
 388   libc_cv_static_nss_crypt=no
 389 fi
 390 AC_SUBST(libc_cv_nss_crypt)
 391 AC_SUBST(libc_cv_static_nss_crypt)
 392
 393
 394 AC_ARG_ENABLE([systemtap],
 395               [AS_HELP_STRING([--enable-systemtap],
 396                [enable systemtap static probe points @<:@default=no@:>@])],
 397               [systemtap=$enableval],
 398               [systemtap=no])
 399 if test "x$systemtap" != xno; then
 400   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 401   old_CFLAGS="$CFLAGS"
 402   CFLAGS="-std=gnu11 $CFLAGS"
 403   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 404 void foo (int i, void *p)
 405 {
 406   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 407        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 408 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 409   CFLAGS="$old_CFLAGS"])
 410   if test $libc_cv_sdt = yes; then
 411     AC_DEFINE([USE_STAP_PROBE])
 412   elif test "x$systemtap" != xauto; then
 413     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 414   fi
 415 fi
 416
 417 AC_ARG_ENABLE([build-nscd],
 418               [AS_HELP_STRING([--disable-build-nscd],
 419                [disable building and installing the nscd daemon])],
 420               [build_nscd=$enableval],
 421               [build_nscd=default])
 422 AC_SUBST(build_nscd)
 423
 424 # Note the use of $use_nscd is near the bottom of the file.
 425 AC_ARG_ENABLE([nscd],
 426               [AS_HELP_STRING([--disable-nscd],
 427                [library functions will not contact the nscd daemon])],
 428               [use_nscd=$enableval],
 429               [use_nscd=yes])
 430
 431 AC_ARG_ENABLE([pt_chown],
 432               [AS_HELP_STRING([--enable-pt_chown],
 433                [Enable building and installing pt_chown])],
 434               [build_pt_chown=$enableval],
 435               [build_pt_chown=no])
 436 AC_SUBST(build_pt_chown)
 437 if test "$build_pt_chown" = yes; then
 438   AC_DEFINE(HAVE_PT_CHOWN)
 439 fi
 440
 441 AC_ARG_ENABLE([tunables],
 442               [AS_HELP_STRING([--enable-tunables],
 443                [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
 444               [have_tunables=$enableval],
 445               [have_tunables=yes])
 446 AC_SUBST(have_tunables)
 447 if test "$have_tunables" = yes; then
 448   AC_DEFINE(HAVE_TUNABLES)
 449 fi
 450
 451 # The abi-tags file uses a fairly simplistic model for name recognition that
 452 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
 453 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
 454 # This doesn't get used much beyond that, so it's fairly safe.
 455 case "$host_os" in
 456 linux*)
 457   ;;
 458 gnu*)
 459   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 460   ;;
 461 esac
 462
 463 AC_ARG_ENABLE([mathvec],
 464               [AS_HELP_STRING([--enable-mathvec],
 465               [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
 466               [build_mathvec=$enableval],
 467               [build_mathvec=notset])
 468
 469 AC_TRY_COMPILE([], [
 470 #ifndef __CET__
 471 # error no CET compiler support
 472 #endif],
 473                [libc_cv_compiler_default_cet=yes],
 474                [libc_cv_compiler_default_cet=no])
 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=$enableval],
 480               [enable_cet=$libc_cv_compiler_default_cet])
 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 -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
 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 $m
 805   # Prepend the machine's FPU directory unless the architecture specific
 806   # preconfigure disables it.
 807   if test "$libc_cv_with_fp" = yes; then
 808     maybe_fpu=/fpu
 809   else
 810     maybe_fpu=/nofpu
 811   fi
 812   # For each machine term, try it with and then without /multiarch.
 813   for try_fpu in $maybe_fpu ''; do
 814     for try_multi in $multi_arch_d ''; do
 815       mach="$mach /$1$try_fpu$try_multi"
 816     done
 817   done
 818   tail="$2"
 819 done
 820
 821 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 822 changequote([,])dnl
 823
 824 # Find what sysdep directories exist.
 825 sysnames=
 826 for b in $base ''; do
 827   for m0 in $mach ''; do
 828     for v in /$vendor ''; do
 829       test "$v" = / && continue
 830       for o in /$ostry ''; do
 831         test "$o" = / && continue
 832         for m in $mach ''; do
 833           try_suffix="$m0$b$v$o$m"
 834           if test -n "$try_suffix"; then
 835             try_srcdir="${srcdir}/"
 836             try="sysdeps$try_suffix"
 837             test -n "$enable_debug_configure" &&
 838             echo "$0 [DEBUG]: try $try" >&2
 839             if test -d "$try_srcdir$try"; then
 840               sysnames="$sysnames $try"
 841               { test -n "$o" || test -n "$b"; } && os_used=t
 842               { test -n "$m" || test -n "$m0"; } && machine_used=t
 843               case x${m0:-$m} in
 844               x*/$submachine) submachine_used=t ;;
 845               esac
 846             fi
 847           fi
 848         done
 849       done
 850     done
 851   done
 852 done
 853
 854 # If the assembler supports gnu_indirect_function symbol type and the
 855 # architecture supports multi-arch, we enable multi-arch by default.
 856 case $sysnames in
 857 *"$multi_arch_d"*)
 858   ;;
 859 *)
 860   test x"$multi_arch" = xdefault && multi_arch=no
 861   ;;
 862 esac
 863 if test x"$multi_arch" != xno; then
 864   AC_DEFINE(USE_MULTIARCH)
 865 fi
 866 AC_SUBST(multi_arch)
 867
 868 if test -z "$os_used" && test "$os" != none; then
 869   AC_MSG_ERROR(Operating system $os is not supported.)
 870 fi
 871 if test -z "$machine_used" && test "$machine" != none; then
 872   AC_MSG_ERROR(The $machine is not supported.)
 873 fi
 874 if test -z "$submachine_used" && test -n "$submachine"; then
 875   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 876 fi
 877 AC_SUBST(submachine)
 878
 879 # We have now validated the configuration.
 880
 881 # Expand the list of system names into a full list of directories
 882 # from each element's parent name and Implies file (if present).
 883 set $sysnames
 884 names=
 885 while test $# -gt 0; do
 886   name=$1
 887   shift
 888
 889   case " $names " in *" $name "*)
 890     # Already in the list.
 891     continue
 892   esac
 893
 894   # Report each name as we discover it, so there is no long pause in output.
 895   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 896
 897   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 898
 899   case $name in
 900     /*) xsrcdir= ;;
 901     *)  xsrcdir=$srcdir/ ;;
 902   esac
 903   test -n "$enable_debug_configure" &&
 904   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 905
 906   for implies_file in Implies Implies-before Implies-after; do
 907     implies_type=`echo $implies_file | sed s/-/_/`
 908     eval ${implies_type}=
 909     if test -f $xsrcdir$name/$implies_file; then
 910       # Collect more names from the `Implies' file (removing comments).
 911       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
 912       for x in $implied_candidate; do
 913         found=no
 914         if test -d $xsrcdir$name_base/$x; then
 915           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
 916           found=yes
 917         fi
 918         try="sysdeps/$x"
 919         try_srcdir=$srcdir/
 920         test -n "$enable_debug_configure" &&
 921          echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
 922         if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 923         then
 924           eval "${implies_type}=\"\$${implies_type} \$try\""
 925           found=yes
 926         fi
 927         if test $found = no; then
 928           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
 929         fi
 930       done
 931     fi
 932   done
 933
 934   # Add NAME to the list of names.
 935   names="$names $name"
 936
 937   # Find the parent of NAME, using the empty string if it has none.
 938 changequote(,)dnl
 939   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 940 changequote([,])dnl
 941
 942   test -n "$enable_debug_configure" &&
 943     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
 944 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
 945
 946   # Add the names implied by NAME, and NAME's parent (if it has one), to
 947   # the list of names to be processed (the argument list).  We prepend the
 948   # implied names to the list and append the parent.  We want implied
 949   # directories to come before further directories inferred from the
 950   # configuration components; this ensures that for sysv4, unix/common
 951   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 952   # after sysv4).
 953   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
 954   test -n "$sysnames" && set $sysnames
 955 done
 956
 957 # Add the default directories.
 958 default_sysnames="sysdeps/generic"
 959 sysnames="$names $default_sysnames"
 960 AC_SUBST(sysnames)
 961 # The other names were emitted during the scan.
 962 AC_MSG_RESULT($default_sysnames)
 963
 964
 965 ### Locate tools.
 966
 967 AC_PROG_INSTALL
 968 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
 969   # The makefiles need to use a different form to find it in $srcdir.
 970   INSTALL='\$(..)./scripts/install-sh -c'
 971 fi
 972 AC_PROG_LN_S
 973
 974 LIBC_PROG_BINUTILS
 975
 976 # Accept binutils 2.25 or newer.
 977 AC_CHECK_PROG_VER(AS, $AS, --version,
 978                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
 979                   [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 980                   AS=: critic_missing="$critic_missing as")
 981
 982 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
 983   # Accept gold 1.14 or higher
 984   AC_CHECK_PROG_VER(LD, $LD, --version,
 985                     [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
 986                     [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
 987                     LD=: critic_missing="$critic_missing GNU gold")
 988 else
 989   AC_CHECK_PROG_VER(LD, $LD, --version,
 990                     [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 991                     [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 992                     LD=: critic_missing="$critic_missing GNU ld")
 993 fi
 994
 995 # These programs are version sensitive.
 996 AC_CHECK_TOOL_PREFIX
 997 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
 998   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
 999   [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1000
1001 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1002   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1003   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1004   MSGFMT=: aux_missing="$aux_missing msgfmt")
1005 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1006   [GNU texinfo.* \([0-9][0-9.]*\)],
1007   [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1008   MAKEINFO=: aux_missing="$aux_missing makeinfo")
1009 AC_CHECK_PROG_VER(SED, sed, --version,
1010   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1011   [3.0[2-9]*|3.[1-9]*|[4-9]*],
1012   SED=: aux_missing="$aux_missing sed")
1013 AC_CHECK_PROG_VER(AWK, gawk, --version,
1014   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1015   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1016 AC_CHECK_PROG_VER(BISON, bison, --version,
1017   [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1018   [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
1019
1020 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1021 AC_TRY_COMPILE([], [
1022 #if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
1023 #error insufficient compiler
1024 #endif],
1025                [libc_cv_compiler_ok=yes],
1026                [libc_cv_compiler_ok=no])])
1027 AS_IF([test $libc_cv_compiler_ok != yes],
1028       [critic_missing="$critic_missing compiler"])
1029
1030 AC_CHECK_TOOL(NM, nm, false)
1031
1032 if test "x$maintainer" = "xyes"; then
1033   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1034   case "x$AUTOCONF" in
1035   xno|x|x:) AUTOCONF=no ;;
1036   *)
1037     AC_CACHE_CHECK(dnl
1038   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1039     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1040       libc_cv_autoconf_works=yes
1041     else
1042       libc_cv_autoconf_works=no
1043     fi])
1044     test $libc_cv_autoconf_works = yes || AUTOCONF=no
1045     ;;
1046   esac
1047   if test "x$AUTOCONF" = xno; then
1048     aux_missing="$aux_missing autoconf"
1049   fi
1050 else
1051   AUTOCONF=no
1052 fi
1053
1054 # Check for python3 if available, or else python.
1055 AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
1056   [Python \([0-9][0-9.]*\)],
1057   [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
1058   critic_missing="$critic_missing python")
1059 PYTHON="$PYTHON_PROG -B"
1060 AC_SUBST(PYTHON)
1061
1062 test -n "$critic_missing" && AC_MSG_ERROR([
1063 *** These critical programs are missing or too old:$critic_missing
1064 *** Check the INSTALL file for required versions.])
1065
1066 test -n "$aux_missing" && AC_MSG_WARN([
1067 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1068 *** some features or tests will be disabled.
1069 *** Check the INSTALL file for required versions.])
1070
1071 # if using special system headers, find out the compiler's sekrit
1072 # header directory and add that to the list.  NOTE: Only does the right
1073 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
1074 if test -n "$sysheaders"; then
1075   SYSINCLUDES=-nostdinc
1076   for d in include include-fixed; do
1077     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1078     SYSINCLUDES="$SYSINCLUDES -isystem $i"
1079   done
1080   SYSINCLUDES="$SYSINCLUDES \
1081 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1082   if test -n "$CXX"; then
1083     CXX_SYSINCLUDES=
1084     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1085     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1086       test "x$cxxheaders" != x &&
1087       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1088     done
1089   fi
1090 fi
1091 AC_SUBST(SYSINCLUDES)
1092 AC_SUBST(CXX_SYSINCLUDES)
1093
1094 # Obtain some C++ header file paths.  This is used to make a local
1095 # copy of those headers in Makerules.
1096 if test -n "$CXX"; then
1097   find_cxx_header () {
1098     echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1099          | sed -n "\,$1:,{s/:\$//;p}"
1100   }
1101   CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1102   CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1103   CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1104 fi
1105 AC_SUBST(CXX_CSTDLIB_HEADER)
1106 AC_SUBST(CXX_CMATH_HEADER)
1107 AC_SUBST(CXX_BITS_STD_ABS_H)
1108
1109 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1110 # since this would lead to problems installing/building glibc.
1111 # LD_LIBRARY_PATH contains the current directory if one of the following
1112 # is true:
1113 # - one of the terminals (":" and ";") is the first or last sign
1114 # - two terminals occur directly after each other
1115 # - the path contains an element with a dot in it
1116 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1117 changequote(,)dnl
1118 case ${LD_LIBRARY_PATH} in
1119   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1120     ld_library_path_setting="contains current directory"
1121     ;;
1122   *)
1123     ld_library_path_setting="ok"
1124     ;;
1125 esac
1126 changequote([,])dnl
1127 AC_MSG_RESULT($ld_library_path_setting)
1128 if test "$ld_library_path_setting" != "ok"; then
1129 AC_MSG_ERROR([
1130 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1131 *** building glibc. Please change the environment variable
1132 *** and run configure again.])
1133 fi
1134
1135 AC_PATH_PROG(BASH_SHELL, bash, no)
1136
1137 AC_PATH_PROG(PERL, perl, no)
1138 if test "$PERL" != no &&
1139    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1140   PERL=no
1141 fi
1142 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1143              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1144
1145 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1146 cat > conftest.s <<EOF
1147 .text
1148 foo:
1149 .set glibc_conftest_frobozz,foo
1150 .globl glibc_conftest_frobozz
1151 EOF
1152 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1153 # (but it doesn't work), so we must do a linking check to be sure.
1154 cat > conftest1.c <<\EOF
1155 extern int glibc_conftest_frobozz;
1156 void _start() { glibc_conftest_frobozz = 1; }
1157 EOF
1158 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1159             -nostartfiles -nostdlib $no_ssp \
1160             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1161   libc_cv_asm_set_directive=yes
1162 else
1163   libc_cv_asm_set_directive=no
1164 fi
1165 rm -f conftest*])
1166 if test $libc_cv_asm_set_directive = yes; then
1167   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1168 fi
1169
1170 AC_CACHE_CHECK(linker support for protected data symbol,
1171                libc_cv_protected_data,
1172                [cat > conftest.c <<EOF
1173                 int bar __attribute__ ((visibility ("protected"))) = 1;
1174 EOF
1175                 libc_cv_protected_data=no
1176                 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1177                   cat > conftest.c <<EOF
1178                   extern int bar;
1179                   int main (void) { return bar; }
1180 EOF
1181                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1182                     libc_cv_protected_data=yes
1183                   fi
1184                 fi
1185                 rm -f conftest.*
1186                ])
1187 AC_SUBST(libc_cv_protected_data)
1188
1189 AC_CACHE_CHECK(linker support for INSERT in linker script,
1190                libc_cv_insert,
1191                [cat > conftest.c <<EOF
1192                 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1193                 int test (void) { return bar; }
1194 EOF
1195                 cat > conftest.t <<EOF
1196                 SECTIONS
1197                 {
1198                   .bar : { *(.bar) }
1199                 }
1200                 INSERT AFTER .rela.dyn;
1201 EOF
1202                 libc_cv_insert=no
1203                 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1204                   libc_cv_insert=yes
1205                 fi
1206                 rm -f conftest.*
1207                ])
1208 AC_SUBST(libc_cv_insert)
1209
1210 AC_CACHE_CHECK(for broken __attribute__((alias())),
1211                libc_cv_broken_alias_attribute,
1212                [cat > conftest.c <<EOF
1213                extern int foo (int x) __asm ("xyzzy");
1214                int bar (int x) { return x; }
1215                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1216                extern int dfoo;
1217                extern __typeof (dfoo) dfoo __asm ("abccb");
1218                int dfoo = 1;
1219 EOF
1220                libc_cv_broken_alias_attribute=yes
1221                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1222                  if grep 'xyzzy' conftest.s >/dev/null &&
1223                     grep 'abccb' conftest.s >/dev/null; then
1224                    libc_cv_broken_alias_attribute=no
1225                  fi
1226                fi
1227                rm -f conftest.c conftest.s
1228                ])
1229 if test $libc_cv_broken_alias_attribute = yes; then
1230   AC_MSG_ERROR(working alias attribute support required)
1231 fi
1232
1233 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1234                libc_cv_have_sdata_section,
1235                [echo "int i;" > conftest.c
1236                 libc_cv_have_sdata_section=no
1237                 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1238                    | grep '\.sdata' >/dev/null; then
1239                   libc_cv_have_sdata_section=yes
1240                 fi
1241                 rm -f conftest.c conftest.so
1242                ])
1243 if test $libc_cv_have_sdata_section = yes; then
1244   AC_DEFINE(HAVE_SDATA_SECTION)
1245 fi
1246
1247 AC_CACHE_CHECK(for libunwind-support in compiler,
1248                libc_cv_cc_with_libunwind, [
1249   cat > conftest.c <<EOF
1250 int main (void) { return 0; }
1251 EOF
1252   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1253      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1254     libc_cv_cc_with_libunwind=yes
1255   else
1256     libc_cv_cc_with_libunwind=no
1257   fi
1258   rm -f conftest*])
1259 AC_SUBST(libc_cv_cc_with_libunwind)
1260 if test $libc_cv_cc_with_libunwind = yes; then
1261   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1262 fi
1263
1264 ASFLAGS_config=
1265 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1266                libc_cv_as_noexecstack, [dnl
1267 cat > conftest.c <<EOF
1268 void foo (void) { }
1269 EOF
1270 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1271                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1272    && grep .note.GNU-stack conftest.s >/dev/null \
1273    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1274                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1275 then
1276   libc_cv_as_noexecstack=yes
1277 else
1278   libc_cv_as_noexecstack=no
1279 fi
1280 rm -f conftest*])
1281 if test $libc_cv_as_noexecstack = yes; then
1282   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1283 fi
1284 AC_SUBST(ASFLAGS_config)
1285
1286 AC_CACHE_CHECK(for -z combreloc,
1287                libc_cv_z_combreloc, [dnl
1288 cat > conftest.c <<EOF
1289 extern int bar (int);
1290 extern int mumble;
1291 int foo (void) { return bar (mumble); }
1292 EOF
1293 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1294                         -fPIC -shared $no_ssp -o conftest.so conftest.c
1295                         -nostdlib -nostartfiles
1296                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1297 then
1298 dnl The following test is a bit weak.  We must use a tool which can test
1299 dnl cross-platform since the gcc used can be a cross compiler.  Without
1300 dnl introducing new options this is not easily doable.  Instead use a tool
1301 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1302 dnl look for a section named .rel.dyn or .rela.dyn.
1303   if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1304     libc_cv_z_combreloc=yes
1305   else
1306     libc_cv_z_combreloc=no
1307   fi
1308 else
1309   libc_cv_z_combreloc=no
1310 fi
1311 rm -f conftest*])
1312 if test "$libc_cv_z_combreloc" = yes; then
1313   AC_DEFINE(HAVE_Z_COMBRELOC)
1314 fi
1315 AC_SUBST(libc_cv_z_combreloc)
1316
1317 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1318                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1319 AC_SUBST(libc_cv_z_execstack)
1320
1321 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1322                     [-Wl,--no-dynamic-linker],
1323                     [libc_cv_no_dynamic_linker=yes],
1324                     [libc_cv_no_dynamic_linker=no])
1325 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1326
1327 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1328 LIBC_TRY_CC_OPTION([-static-pie],
1329                    [libc_cv_static_pie=yes],
1330                    [libc_cv_static_pie=no])
1331 ])
1332 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1333
1334 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1335 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1336 ])
1337
1338 AC_SUBST(libc_cv_fpie)
1339
1340 AC_CACHE_CHECK(for --hash-style option,
1341                libc_cv_hashstyle, [dnl
1342 cat > conftest.c <<EOF
1343 int _start (void) { return 42; }
1344 EOF
1345 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1346                             -fPIC -shared -o conftest.so conftest.c
1347                             -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1348 then
1349   libc_cv_hashstyle=yes
1350 else
1351   libc_cv_hashstyle=no
1352 fi
1353 rm -f conftest*])
1354 AC_SUBST(libc_cv_hashstyle)
1355
1356 # The linker's default -shared behavior is good enough if it
1357 # does these things that our custom linker scripts ensure that
1358 # all allocated NOTE sections come first.
1359 if test "$use_default_link" = default; then
1360   AC_CACHE_CHECK([for sufficient default -shared layout],
1361                   libc_cv_use_default_link, [dnl
1362   libc_cv_use_default_link=no
1363   cat > conftest.s <<\EOF
1364           .section .note.a,"a",%note
1365           .balign 4
1366           .long 4,4,9
1367           .string "GNU"
1368           .string "foo"
1369           .section .note.b,"a",%note
1370           .balign 4
1371           .long 4,4,9
1372           .string "GNU"
1373           .string "bar"
1374 EOF
1375   if AC_TRY_COMMAND([dnl
1376   ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1377        ac_try=`$READELF -S conftest.so | sed -n \
1378          ['${x;p;}
1379           s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
1380           t a
1381           b
1382           : a
1383           H']`
1384   then
1385     libc_seen_a=no libc_seen_b=no
1386     set -- $ac_try
1387     while test $# -ge 2 -a "$1" = NOTE; do
1388       case "$2" in
1389       .note.a) libc_seen_a=yes ;;
1390       .note.b) libc_seen_b=yes ;;
1391       esac
1392       shift 2
1393     done
1394     case "$libc_seen_a$libc_seen_b" in
1395     yesyes)
1396       libc_cv_use_default_link=yes
1397       ;;
1398     *)
1399       echo >&AS_MESSAGE_LOG_FD "\
1400 $libc_seen_a$libc_seen_b from:
1401 $ac_try"
1402       ;;
1403     esac
1404   fi
1405   rm -f conftest*])
1406   use_default_link=$libc_cv_use_default_link
1407 fi
1408
1409 AC_CACHE_CHECK(for GLOB_DAT reloc,
1410                libc_cv_has_glob_dat, [dnl
1411 cat > conftest.c <<EOF
1412 extern int mumble;
1413 int foo (void) { return mumble; }
1414 EOF
1415 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1416                         -fPIC -shared -o conftest.so conftest.c
1417                         -nostdlib -nostartfiles $no_ssp
1418                         1>&AS_MESSAGE_LOG_FD])
1419 then
1420 dnl look for GLOB_DAT relocation.
1421   if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1422     libc_cv_has_glob_dat=yes
1423   else
1424     libc_cv_has_glob_dat=no
1425   fi
1426 else
1427   libc_cv_has_glob_dat=no
1428 fi
1429 rm -f conftest*])
1430 AC_SUBST(libc_cv_has_glob_dat)
1431
1432 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1433 if libc_cv_output_format=`
1434 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1435 then
1436   :
1437 else
1438   libc_cv_output_format=
1439 fi
1440 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1441 AC_SUBST(libc_cv_output_format)
1442
1443 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1444 cat > conftest.c <<EOF
1445 int foo;
1446 EOF
1447 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1448                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1449 then
1450   libc_cv_fno_toplevel_reorder=yes
1451 else
1452   libc_cv_fno_toplevel_reorder=no
1453 fi
1454 rm -f conftest*])
1455 if test $libc_cv_fno_toplevel_reorder = yes; then
1456   fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1457 else
1458   fno_unit_at_a_time=-fno-unit-at-a-time
1459 fi
1460 AC_SUBST(fno_unit_at_a_time)
1461
1462 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1463 [dnl
1464 cat > conftest.c <<EOF
1465 __thread int i;
1466 void foo (void)
1467 {
1468   i = 10;
1469 }
1470 EOF
1471 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1472                    conftest.c 1>&AS_MESSAGE_LOG_FD])
1473 then
1474   libc_cv_mtls_dialect_gnu2=yes
1475 else
1476   libc_cv_mtls_dialect_gnu2=no
1477 fi
1478 rm -f conftest*])
1479 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1480 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1481
1482 AC_CACHE_CHECK(whether cc puts quotes around section names,
1483                libc_cv_have_section_quotes,
1484                [cat > conftest.c <<EOF
1485                 static const int foo
1486                 __attribute__ ((section ("bar"))) = 1;
1487 EOF
1488                 if ${CC-cc} -S conftest.c -o conftest.s; then
1489                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1490                     libc_cv_have_section_quotes=yes
1491                   else
1492                     libc_cv_have_section_quotes=no
1493                   fi
1494                 else
1495                   libc_cv_have_section_quotes=unknown
1496                 fi
1497                 rm -f conftest.{c,s}
1498                 ])
1499 if test $libc_cv_have_section_quotes = yes; then
1500   AC_DEFINE(HAVE_SECTION_QUOTES)
1501 fi
1502
1503 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1504 cat > conftest.c <<\EOF
1505 void zero (void *x)
1506 {
1507   __builtin_memset (x, 0, 1000);
1508 }
1509 EOF
1510 dnl
1511 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1512 then
1513   libc_cv_gcc_builtin_memset=no
1514 else
1515   libc_cv_gcc_builtin_memset=yes
1516 fi
1517 rm -f conftest* ])
1518 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1519   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1520 fi
1521
1522 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1523 cat > conftest.c <<\EOF
1524 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1525 char *foo (const char *a, const char *b)
1526 {
1527   return __builtin_strstr (a, b);
1528 }
1529 EOF
1530 dnl
1531 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1532 then
1533   libc_cv_gcc_builtin_redirection=yes
1534 else
1535   libc_cv_gcc_builtin_redirection=no
1536 fi
1537 rm -f conftest* ])
1538 if test "$libc_cv_gcc_builtin_redirection" = no; then
1539   AC_MSG_ERROR([support for the symbol redirection needed])
1540 fi
1541
1542 dnl Determine how to disable generation of FMA instructions.
1543 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1544                libc_cv_cc_nofma, [dnl
1545 libc_cv_cc_nofma=
1546 for opt in -ffp-contract=off -mno-fused-madd; do
1547   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1548 done])
1549 AC_SUBST(libc_cv_cc_nofma)
1550
1551 if test -n "$submachine"; then
1552   AC_CACHE_CHECK([for compiler option for CPU variant],
1553                  libc_cv_cc_submachine, [dnl
1554   libc_cv_cc_submachine=no
1555   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1556     LIBC_TRY_CC_OPTION([$opt], [
1557       libc_cv_cc_submachine="$opt"
1558       break], [])
1559   done])
1560   if test "x$libc_cv_cc_submachine" = xno; then
1561     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1562   fi
1563 fi
1564 AC_SUBST(libc_cv_cc_submachine)
1565
1566 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1567 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1568 cat > conftest.c <<EOF
1569 void
1570 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1571 foo (void) {}
1572 EOF
1573 libc_cv_cc_loop_to_function=no
1574 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1575 then
1576   libc_cv_cc_loop_to_function=yes
1577 fi
1578 rm -f conftest*])
1579 if test $libc_cv_cc_loop_to_function = yes; then
1580   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1581 fi
1582 AC_SUBST(libc_cv_cc_loop_to_function)
1583
1584 dnl Check whether we have the gd library available.
1585 AC_MSG_CHECKING(for libgd)
1586 if test "$with_gd" != "no"; then
1587   old_CFLAGS="$CFLAGS"
1588   CFLAGS="$CFLAGS $libgd_include"
1589   old_LDFLAGS="$LDFLAGS"
1590   LDFLAGS="$LDFLAGS $libgd_ldflags"
1591   old_LIBS="$LIBS"
1592   LIBS="$LIBS -lgd -lpng -lz -lm"
1593   AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1594   CFLAGS="$old_CFLAGS"
1595   LDFLAGS="$old_LDFLAGS"
1596   LIBS="$old_LIBS"
1597 else
1598   LIBGD=no
1599 fi
1600 AC_MSG_RESULT($LIBGD)
1601 AC_SUBST(LIBGD)
1602
1603 # SELinux detection
1604 if test x$with_selinux = xno ; then
1605   have_selinux=no;
1606 else
1607   # See if we have the SELinux library
1608   AC_CHECK_LIB(selinux, is_selinux_enabled,
1609                have_selinux=yes, have_selinux=no)
1610   if test x$with_selinux = xyes ; then
1611     if test x$have_selinux = xno ; then
1612       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1613     fi
1614   fi
1615 fi
1616 # Check if we're building with SELinux support.
1617 if test "x$have_selinux" = xyes; then
1618   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1619
1620   # See if we have the libaudit library
1621   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1622                have_libaudit=yes, have_libaudit=no)
1623   if test "x$have_libaudit" = xyes; then
1624     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1625   fi
1626   AC_SUBST(have_libaudit)
1627
1628   # See if we have the libcap library
1629   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1630   if test "x$have_libcap" = xyes; then
1631     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1632   fi
1633   AC_SUBST(have_libcap)
1634 fi
1635 AC_SUBST(have_selinux)
1636
1637 CPPUNDEFS=
1638 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1639 dnl Since we are building the implementations of the fortified functions here,
1640 dnl having the macro defined interacts very badly.
1641 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1642 [AC_TRY_COMPILE([], [
1643 #ifdef _FORTIFY_SOURCE
1644 # error bogon
1645 #endif],
1646                 [libc_cv_predef_fortify_source=no],
1647                 [libc_cv_predef_fortify_source=yes])])
1648 if test $libc_cv_predef_fortify_source = yes; then
1649   CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1650 fi
1651 AC_SUBST(CPPUNDEFS)
1652
1653 # Some linkers on some architectures support __ehdr_start but with
1654 # bugs.  Make sure usage of it does not create relocations in the
1655 # output (as the linker should resolve them all for us).
1656 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1657                libc_cv_ehdr_start, [
1658 old_CFLAGS="$CFLAGS"
1659 old_LDFLAGS="$LDFLAGS"
1660 old_LIBS="$LIBS"
1661 CFLAGS="$CFLAGS -fPIC"
1662 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1663 LIBS=
1664 AC_LINK_IFELSE([AC_LANG_SOURCE([
1665 typedef struct {
1666   char foo;
1667   long val;
1668 } Ehdr;
1669 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1670 long ehdr (void) { return __ehdr_start.val; }
1671 ])],
1672                [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1673                   libc_cv_ehdr_start=broken
1674                 else
1675                   libc_cv_ehdr_start=yes
1676                 fi], [libc_cv_ehdr_start=no])
1677 CFLAGS="$old_CFLAGS"
1678 LDFLAGS="$old_LDFLAGS"
1679 LIBS="$old_LIBS"
1680 ])
1681 if test "$libc_cv_ehdr_start" = yes; then
1682   AC_DEFINE([HAVE_EHDR_START])
1683 elif test "$libc_cv_ehdr_start" = broken; then
1684   AC_MSG_WARN([linker is broken -- you should upgrade])
1685 fi
1686
1687 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1688                libc_cv_builtin_trap, [dnl
1689 libc_cv_builtin_trap=no
1690 AC_TRY_COMPILE([], [__builtin_trap ()], [
1691 libc_undefs=`$NM -u conftest.o |
1692   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1693     2>&AS_MESSAGE_LOG_FD` || {
1694   AC_MSG_ERROR([confusing output from $NM -u])
1695 }
1696 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1697 if test -z "$libc_undefs"; then
1698   libc_cv_builtin_trap=yes
1699 fi])])
1700 if test $libc_cv_builtin_trap = yes; then
1701   AC_DEFINE([HAVE_BUILTIN_TRAP])
1702 fi
1703
1704 dnl C++ feature tests.
1705 AC_LANG_PUSH([C++])
1706
1707 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1708                libc_cv_cxx_thread_local, [
1709 old_CXXFLAGS="$CXXFLAGS"
1710 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1711 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1712 #include <thread>
1713
1714 // Compiler support.
1715 struct S
1716 {
1717   S ();
1718   ~S ();
1719 };
1720 thread_local S s;
1721 S * get () { return &s; }
1722
1723 // libstdc++ support.
1724 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1725 #error __cxa_thread_atexit_impl not supported
1726 #endif
1727 ])],
1728                [libc_cv_cxx_thread_local=yes],
1729                [libc_cv_cxx_thread_local=no])
1730 CXXFLAGS="$old_CXXFLAGS"
1731 ])
1732 AC_SUBST(libc_cv_cxx_thread_local)
1733
1734 AC_LANG_POP([C++])
1735 dnl End of C++ feature tests.
1736
1737 ### End of automated tests.
1738 ### Now run sysdeps configure fragments.
1739
1740 # They also can set these variables.
1741 use_ldconfig=no
1742 ldd_rewrite_script=no
1743 libc_cv_sysconfdir=$sysconfdir
1744 libc_cv_localstatedir=$localstatedir
1745 libc_cv_gcc_unwind_find_fde=no
1746 libc_cv_idn=no
1747
1748 # Iterate over all the sysdep directories we will use, running their
1749 # configure fragments.
1750 for dir in $sysnames; do
1751   case $dir in
1752     /*) dest=$dir ;;
1753     *)  dest=$srcdir/$dir ;;
1754   esac
1755   if test -r $dest/configure; then
1756     AC_MSG_RESULT(running configure fragment for $dir)
1757     . $dest/configure
1758   fi
1759 done
1760
1761 if test x"$build_mathvec" = xnotset; then
1762   build_mathvec=no
1763 fi
1764 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1765
1766 AC_SUBST(libc_extra_cflags)
1767 AC_SUBST(libc_extra_cppflags)
1768
1769 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1770   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1771 fi
1772 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1773
1774 # A sysdeps configure fragment can reset this if IFUNC is not actually
1775 # usable even though the assembler knows how to generate the symbol type.
1776 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1777   AC_DEFINE(HAVE_IFUNC)
1778 fi
1779 LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
1780
1781 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1782   AC_DEFINE(HAVE_GCC_IFUNC)
1783 fi
1784
1785 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1786 # configure fragment can override the value to prevent this AC_DEFINE.
1787 AC_SUBST(use_nscd)
1788 if test "x$use_nscd" != xno; then
1789   AC_DEFINE([USE_NSCD])
1790 fi
1791 if test "x$build_nscd" = xdefault; then
1792   build_nscd=$use_nscd
1793 fi
1794
1795 AC_SUBST(libc_cv_slibdir)
1796 AC_SUBST(libc_cv_rtlddir)
1797 AC_SUBST(libc_cv_complocaledir)
1798 AC_SUBST(libc_cv_sysconfdir)
1799 AC_SUBST(libc_cv_localstatedir)
1800 AC_SUBST(libc_cv_rootsbindir)
1801
1802 if test x$use_ldconfig = xyes; then
1803   AC_DEFINE(USE_LDCONFIG)
1804 fi
1805 AC_SUBST(use_ldconfig)
1806 AC_SUBST(ldd_rewrite_script)
1807
1808 AC_SUBST(static)
1809 AC_SUBST(shared)
1810
1811 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1812 [libc_cv_pic_default=yes
1813 cat > conftest.c <<EOF
1814 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1815 # error PIC is default.
1816 #endif
1817 EOF
1818 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1819   libc_cv_pic_default=no
1820 fi
1821 rm -f conftest.*])
1822 AC_SUBST(libc_cv_pic_default)
1823
1824 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1825 [libc_cv_cc_pie_default=yes
1826 cat > conftest.c <<EOF
1827 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1828 # error PIE is default.
1829 #endif
1830 EOF
1831 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1832   libc_cv_cc_pie_default=no
1833 fi
1834 rm -f conftest.*])
1835 libc_cv_pie_default=$libc_cv_cc_pie_default
1836 AC_SUBST(libc_cv_cc_pie_default)
1837 AC_SUBST(libc_cv_pie_default)
1838
1839 # Set the `multidir' variable by grabbing the variable from the compiler.
1840 # We do it once and save the result in a generated makefile.
1841 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1842 AC_SUBST(libc_cv_multidir)
1843
1844 if test "$static_pie" = yes; then
1845   # The linker must support --no-dynamic-linker.
1846   if test "$libc_cv_no_dynamic_linker" != yes; then
1847     AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1848   fi
1849   # Default to PIE.
1850   libc_cv_pie_default=yes
1851   AC_DEFINE(ENABLE_STATIC_PIE)
1852 fi
1853 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1854
1855 AC_SUBST(profile)
1856 AC_SUBST(static_nss)
1857
1858 AC_SUBST(DEFINES)
1859
1860 dnl See sysdeps/mach/configure.ac for this variable.
1861 AC_SUBST(mach_interface_list)
1862
1863 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1864 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1865 AC_SUBST(VERSION)
1866 AC_SUBST(RELEASE)
1867
1868 AC_CONFIG_FILES([config.make Makefile])
1869 AC_CONFIG_COMMANDS([default],[[
1870 case $CONFIG_FILES in *config.make*)
1871 echo "$config_vars" >> config.make;;
1872 esac
1873 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1874 AC_OUTPUT