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
  55 # We need the C++ compiler only for testing.
  56 AC_PROG_CXX
  57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
  58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
  59 AC_LANG_PUSH([C++])
  60 # Default, dynamic case.
  61 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  62                [libc_cv_cxx_link_ok=yes],
  63                [libc_cv_cxx_link_ok=no])
  64 # Static case.
  65 old_LDFLAGS="$LDFLAGS"
  66 LDFLAGS="$LDFLAGS -static"
  67 AC_LINK_IFELSE([AC_LANG_SOURCE([
  68 #include <iostream>
  69
  70 int
  71 main()
  72 {
  73   std::cout << "Hello, world!";
  74   return 0;
  75 }
  76 ])],
  77                [],
  78                [libc_cv_cxx_link_ok=no])
  79 LDFLAGS="$old_LDFLAGS"
  80 AC_LANG_POP([C++])])
  81 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
  82
  83 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
  84   AC_MSG_ERROR([you must configure in a separate build directory])
  85 fi
  86
  87 # This will get text that should go into config.make.
  88 config_vars=
  89
  90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  91 AC_ARG_WITH([gd],
  92             AS_HELP_STRING([--with-gd=DIR],
  93                            [find libgd include dir and library with prefix DIR]),
  94             [dnl
  95 case "$with_gd" in
  96 yes|''|no) ;;
  97 *) libgd_include="-I$withval/include"
  98    libgd_ldflags="-L$withval/lib" ;;
  99 esac
 100 ])
 101 AC_ARG_WITH([gd-include],
 102             AS_HELP_STRING([--with-gd-include=DIR],
 103                            [find libgd include files in DIR]),
 104             [dnl
 105 case "$with_gd_include" in
 106 ''|no) ;;
 107 *) libgd_include="-I$withval" ;;
 108 esac
 109 ])
 110 AC_ARG_WITH([gd-lib],
 111             AS_HELP_STRING([--with-gd-lib=DIR],
 112                            [find libgd library files in DIR]),
 113             [dnl
 114 case "$with_gd_lib" in
 115 ''|no) ;;
 116 *) libgd_ldflags="-L$withval" ;;
 117 esac
 118 ])
 119
 120 if test -n "$libgd_include"; then
 121   config_vars="$config_vars
 122 CFLAGS-memusagestat.c = $libgd_include"
 123 fi
 124 if test -n "$libgd_ldflags"; then
 125   config_vars="$config_vars
 126 libgd-LDFLAGS = $libgd_ldflags"
 127 fi
 128
 129 dnl Arguments to specify presence of other packages/features.
 130 AC_ARG_WITH([binutils],
 131             AS_HELP_STRING([--with-binutils=PATH],
 132                            [specify location of binutils (as and ld)]),
 133             [path_binutils=$withval],
 134             [path_binutils=''])
 135 AC_ARG_WITH([selinux],
 136             AS_HELP_STRING([--with-selinux],
 137                            [if building with SELinux support]),
 138             [with_selinux=$withval],
 139             [with_selinux=auto])
 140
 141 AC_ARG_WITH([headers],
 142             AS_HELP_STRING([--with-headers=PATH],
 143                            [location of system headers to use
 144                             (for example /usr/src/linux/include)
 145                             @<:@default=compiler default@:>@]),
 146             [sysheaders=$withval],
 147             [sysheaders=''])
 148 AC_SUBST(sysheaders)
 149
 150 dnl Additional build flags injection.
 151 AC_ARG_WITH([nonshared-cflags],
 152             AS_HELP_STRING([--with-nonshared-cflags=CFLAGS],
 153                            [build nonshared libraries with additional CFLAGS]),
 154             [extra_nonshared_cflags=$withval],
 155             [extra_nonshared_cflags=])
 156 AC_SUBST(extra_nonshared_cflags)
 157 AC_ARG_WITH([rtld-early-cflags],
 158             AS_HELP_STRING([--with-rtld-early-cflags=CFLAGS],
 159                            [build early initialization with additional CFLAGS]),
 160             [rtld_early_cflags=$withval],
 161             [rtld_early_cflags=])
 162 AC_SUBST(rtld_early_cflags)
 163
 164 AC_ARG_WITH([timeoutfactor],
 165             AS_HELP_STRING([--with-timeoutfactor=NUM],
 166                            [specify an integer to scale the timeout]),
 167             [timeoutfactor=$withval],
 168             [timeoutfactor=1])
 169 AC_DEFINE_UNQUOTED(TIMEOUTFACTOR, $timeoutfactor)
 170
 171 AC_ARG_ENABLE([sanity-checks],
 172               AS_HELP_STRING([--disable-sanity-checks],
 173                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 174               [enable_sanity=$enableval],
 175               [enable_sanity=yes])
 176
 177 AC_ARG_ENABLE([shared],
 178               AS_HELP_STRING([--enable-shared],
 179                              [build shared library @<:@default=yes if GNU ld@:>@]),
 180               [shared=$enableval],
 181               [shared=yes])
 182 AC_ARG_ENABLE([profile],
 183               AS_HELP_STRING([--enable-profile],
 184                              [build profiled library @<:@default=no@:>@]),
 185               [profile=$enableval],
 186               [profile=no])
 187 AC_ARG_ENABLE([default-pie],
 188               AS_HELP_STRING([--disable-default-pie],
 189                              [Do not build glibc programs and the testsuite as PIE @<:@default=no@:>@]),
 190               [default_pie=$enableval],
 191               [default_pie=yes])
 192 AC_ARG_ENABLE([timezone-tools],
 193               AS_HELP_STRING([--disable-timezone-tools],
 194                              [do not install timezone tools @<:@default=install@:>@]),
 195               [enable_timezone_tools=$enableval],
 196               [enable_timezone_tools=yes])
 197 AC_SUBST(enable_timezone_tools)
 198
 199 AC_ARG_ENABLE([hardcoded-path-in-tests],
 200               AS_HELP_STRING([--enable-hardcoded-path-in-tests],
 201                              [hardcode newly built glibc path in tests @<:@default=no@:>@]),
 202               [hardcoded_path_in_tests=$enableval],
 203               [hardcoded_path_in_tests=no])
 204 AC_SUBST(hardcoded_path_in_tests)
 205
 206 AC_ARG_ENABLE([hidden-plt],
 207               AS_HELP_STRING([--disable-hidden-plt],
 208                              [do not hide internal function calls to avoid PLT]),
 209               [hidden=$enableval],
 210               [hidden=yes])
 211 if test "x$hidden" = xno; then
 212   AC_DEFINE(NO_HIDDEN)
 213 fi
 214
 215 AC_ARG_ENABLE([bind-now],
 216               AS_HELP_STRING([--enable-bind-now],
 217                              [disable lazy relocations in DSOs]),
 218               [bindnow=$enableval],
 219               [bindnow=no])
 220 AC_SUBST(bindnow)
 221 if test "x$bindnow" = xyes; then
 222   AC_DEFINE(BIND_NOW)
 223 fi
 224
 225 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
 226 dnl -fstack-protector-strong.
 227 AC_ARG_ENABLE([stack-protector],
 228               AS_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
 229                              [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
 230               [enable_stack_protector=$enableval],
 231               [enable_stack_protector=no])
 232 case "$enable_stack_protector" in
 233 all|yes|no|strong) ;;
 234 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
 235 esac
 236
 237 dnl On some platforms we cannot use dynamic loading.  We must provide
 238 dnl static NSS modules.
 239 AC_ARG_ENABLE([static-nss],
 240               AS_HELP_STRING([--enable-static-nss],
 241                              [build static NSS modules @<:@default=no@:>@]),
 242               [static_nss=$enableval],
 243               [static_nss=no])
 244 dnl Enable static NSS also if we build no shared objects.
 245 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 246   static_nss=yes
 247   AC_DEFINE(DO_STATIC_NSS)
 248 fi
 249
 250 AC_ARG_ENABLE([force-install],
 251               AS_HELP_STRING([--disable-force-install],
 252                              [don't force installation of files from this package, even if they are older than the installed files]),
 253               [force_install=$enableval],
 254               [force_install=yes])
 255 AC_SUBST(force_install)
 256
 257 AC_ARG_ENABLE([maintainer-mode],
 258               AS_HELP_STRING([--enable-maintainer-mode],
 259                              [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
 260               [maintainer=$enableval],
 261               [maintainer=no])
 262
 263 dnl On some platforms we allow dropping compatibility with all kernel
 264 dnl versions.
 265 AC_ARG_ENABLE([kernel],
 266               AS_HELP_STRING([--enable-kernel=VERSION],
 267                              [compile for compatibility with kernel not older than VERSION]),
 268               [minimum_kernel=$enableval],
 269               [])
 270 dnl Prevent unreasonable values.
 271 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 272   # Better nothing than this.
 273   minimum_kernel=""
 274 else
 275   if test "$minimum_kernel" = current; then
 276     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 277   fi
 278 fi
 279
 280 dnl For the development we sometimes want gcc to issue even more warnings.
 281 dnl This is not the default since many of the extra warnings are not
 282 dnl appropriate.
 283 AC_ARG_ENABLE([all-warnings],
 284               AS_HELP_STRING([--enable-all-warnings],
 285                              [enable all useful warnings gcc can issue]),
 286               [all_warnings=$enableval],
 287               [])
 288 AC_SUBST(all_warnings)
 289
 290 AC_ARG_ENABLE([werror],
 291               AS_HELP_STRING([--disable-werror],
 292                              [do not build with -Werror]),
 293               [enable_werror=$enableval],
 294               [enable_werror=yes])
 295 AC_SUBST(enable_werror)
 296
 297 AC_ARG_ENABLE([multi-arch],
 298               AS_HELP_STRING([--enable-multi-arch],
 299                              [enable single DSO with optimizations for multiple architectures]),
 300               [multi_arch=$enableval],
 301               [multi_arch=default])
 302
 303 AC_ARG_ENABLE([memory-tagging],
 304               AS_HELP_STRING([--enable-memory-tagging],
 305                              [enable memory tagging if supported by the architecture @<:@default=no@:>@]),
 306               [memory_tagging=$enableval],
 307               [memory_tagging=no])
 308 if test "$memory_tagging" = yes; then
 309   # Only enable this on architectures that support it.
 310   case $host_cpu in
 311     aarch64)
 312       AC_DEFINE(USE_MTAG)
 313       ;;
 314   esac
 315 fi
 316 AC_SUBST(memory_tagging)
 317
 318 AC_ARG_ENABLE([crypt],
 319               AS_HELP_STRING([--disable-crypt],
 320                              [do not build nor install the passphrase hashing library, libcrypt]),
 321               [build_crypt=$enableval],
 322               [build_crypt=yes])
 323 AC_SUBST(build_crypt)
 324
 325 AC_ARG_ENABLE([nss-crypt],
 326               AS_HELP_STRING([--enable-nss-crypt],
 327                              [enable libcrypt to use nss]),
 328               [nss_crypt=$enableval],
 329               [nss_crypt=no])
 330 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
 331   AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
 332   nss_crypt=no
 333 fi
 334 if test x$nss_crypt = xyes; then
 335   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 336   if test $? -ne 0; then
 337     AC_MSG_ERROR([cannot find include directory with nss-config])
 338   fi
 339   nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
 340   if test $? -ne 0; then
 341     AC_MSG_ERROR([cannot find include directory with nspr-config])
 342   fi
 343   old_CFLAGS="$CFLAGS"
 344   CFLAGS="$CFLAGS $nss_includes $nspr_includes"
 345   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 346 #include <hasht.h>
 347 #include <nsslowhash.h>
 348 void f (void) { NSSLOW_Init (); }])],
 349              libc_cv_nss_crypt=yes,
 350              AC_MSG_ERROR([
 351 cannot find NSS headers with lowlevel hash function interfaces]))
 352   old_LIBS="$LIBS"
 353   old_LDFLAGS="$LDFLAGS"
 354   LIBS="$LIBS -lfreebl3"
 355   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 356 #include <hasht.h>
 357 #include <nsslowhash.h>],
 358                                   [NSSLOW_Init();])],
 359                  libc_cv_nss_crypt=yes,
 360                  AC_MSG_ERROR([
 361 cannot link program using lowlevel NSS hash functions]))
 362   # Check to see if there is a static NSS cryptographic library.
 363   # If there isn't then we can't link anything with libcrypt.a,
 364   # and that might mean disabling some static tests.
 365   LDFLAGS="$LDFLAGS -static"
 366   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 367 #include <hasht.h>
 368 #include <nsslowhash.h>],
 369                                   [NSSLOW_Init();])],
 370                  libc_cv_static_nss_crypt=yes,
 371                  libc_cv_static_nss_crypt=no)
 372   LDFLAGS="$old_LDFLAGS"
 373   CFLAGS="$old_CFLAGS"
 374   LIBS="$old_LIBS"
 375 else
 376   libc_cv_nss_crypt=no
 377   libc_cv_static_nss_crypt=no
 378 fi
 379 AC_SUBST(libc_cv_nss_crypt)
 380 AC_SUBST(libc_cv_static_nss_crypt)
 381
 382
 383 AC_ARG_ENABLE([systemtap],
 384               [AS_HELP_STRING([--enable-systemtap],
 385                [enable systemtap static probe points @<:@default=no@:>@])],
 386               [systemtap=$enableval],
 387               [systemtap=no])
 388 if test "x$systemtap" != xno; then
 389   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 390   old_CFLAGS="$CFLAGS"
 391   CFLAGS="-std=gnu11 $CFLAGS"
 392   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 393 void foo (int i, void *p)
 394 {
 395   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 396        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 397 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 398   CFLAGS="$old_CFLAGS"])
 399   if test $libc_cv_sdt = yes; then
 400     AC_DEFINE([USE_STAP_PROBE])
 401   elif test "x$systemtap" != xauto; then
 402     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 403   fi
 404 fi
 405
 406 AC_ARG_ENABLE([build-nscd],
 407               [AS_HELP_STRING([--disable-build-nscd],
 408                [disable building and installing the nscd daemon])],
 409               [build_nscd=$enableval],
 410               [build_nscd=default])
 411 AC_SUBST(build_nscd)
 412
 413 # Note the use of $use_nscd is near the bottom of the file.
 414 AC_ARG_ENABLE([nscd],
 415               [AS_HELP_STRING([--disable-nscd],
 416                [library functions will not contact the nscd daemon])],
 417               [use_nscd=$enableval],
 418               [use_nscd=yes])
 419
 420 AC_ARG_ENABLE([pt_chown],
 421               [AS_HELP_STRING([--enable-pt_chown],
 422                [Enable building and installing pt_chown])],
 423               [build_pt_chown=$enableval],
 424               [build_pt_chown=no])
 425 AC_SUBST(build_pt_chown)
 426 if test "$build_pt_chown" = yes; then
 427   AC_DEFINE(HAVE_PT_CHOWN)
 428 fi
 429
 430 # The abi-tags file uses a fairly simplistic model for name recognition that
 431 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
 432 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
 433 # This doesn't get used much beyond that, so it's fairly safe.
 434 case "$host_os" in
 435 linux*)
 436   ;;
 437 gnu*)
 438   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 439   ;;
 440 esac
 441
 442 AC_ARG_ENABLE([mathvec],
 443               [AS_HELP_STRING([--enable-mathvec],
 444               [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
 445               [build_mathvec=$enableval],
 446               [build_mathvec=notset])
 447
 448 AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
 449 #ifndef __CET__
 450 # error no CET compiler support
 451 #endif]])],
 452                [libc_cv_compiler_default_cet=yes],
 453                [libc_cv_compiler_default_cet=no])
 454
 455 AC_ARG_ENABLE([cet],
 456               AS_HELP_STRING([--enable-cet],
 457                              [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
 458               [enable_cet=$enableval],
 459               [enable_cet=$libc_cv_compiler_default_cet])
 460
 461 AC_ARG_ENABLE([scv],
 462               AC_HELP_STRING([--disable-scv],
 463                              [syscalls will not use scv instruction, even if the kernel supports it, powerpc only]),
 464               [use_scv=$enableval],
 465               [use_scv=yes])
 466
 467 AS_IF([[test "$use_scv" != "no"]],[AC_DEFINE(USE_PPC_SCV)])
 468
 469 dnl Build glibc with _FORTIFY_SOURCE
 470 AC_ARG_ENABLE(fortify-source,
 471               AS_HELP_STRING([--enable-fortify-source@<:@=1|2|3@:>@],
 472                              [Use -D_FORTIFY_SOURCE=[1|2|3] to control code hardening, defaults to highest possible value supported by the build compiler.]),
 473               [enable_fortify_source=$enableval],
 474               [enable_fortify_source=no])
 475 case "$enable_fortify_source" in
 476 1|2|3|no|yes) ;;
 477 *) AC_MSG_ERROR([Not a valid argument for --enable-fortify-source: "$enable_fortify_source"]);;
 478 esac
 479
 480 # We keep the original values in `$config_*' and never modify them, so we
 481 # can write them unchanged into config.make.  Everything else uses
 482 # $machine, $vendor, and $os, and changes them whenever convenient.
 483 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 484
 485 # Don't allow vendor == "unknown"
 486 test "$config_vendor" = unknown && config_vendor=
 487 config_os="`echo $config_os | sed 's/^unknown-//'`"
 488
 489 # Some configurations imply other options.
 490 elf=yes
 491
 492 # The configure fragment of a port can modify these to supplement
 493 # or override the table in the case statement below.  No fragment should
 494 # ever change the config_* variables, however.
 495 machine=$config_machine
 496 vendor=$config_vendor
 497 os=$config_os
 498 base_os=''
 499
 500 submachine=
 501 AC_ARG_WITH([cpu],
 502             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 503             [dnl
 504   case "$withval" in
 505   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 506   no) ;;
 507   *) submachine="$withval" ;;
 508   esac
 509 ])
 510
 511 # An preconfigure script can set this when it wants to disable the sanity
 512 # check below.
 513 libc_config_ok=no
 514
 515 # A preconfigure script for a system that may or may not use fpu
 516 # sysdeps directories sets this to a preprocessor conditional for
 517 # whether to use such directories.
 518 with_fp_cond=1
 519
 520 dnl Let sysdeps/*/preconfigure act here.
 521 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 522
 523
 524 ###
 525 ### By using the undocumented --enable-hacker-mode option for configure
 526 ### one can skip this test to make the configuration not fail for unsupported
 527 ### platforms.
 528 ###
 529 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 530   case "$machine-$host_os" in
 531   *-linux* | *-gnu*)
 532     ;;
 533   *)
 534     AC_MSG_ERROR([
 535 *** The GNU C library is currently unavailable for this platform.
 536 *** If you are interested in seeing glibc on this platform visit
 537 *** the "How to submit a new port" in the wiki:
 538 ***   https://sourceware.org/glibc/wiki/#Development
 539 *** and join the community!])
 540     ;;
 541   esac
 542 fi
 543
 544 # Set base_machine if not set by a preconfigure fragment.
 545 test -n "$base_machine" || base_machine=$machine
 546 AC_SUBST(base_machine)
 547
 548 ### Locate tools.
 549
 550 AC_PROG_INSTALL
 551 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
 552   # The makefiles need to use a different form to find it in $srcdir.
 553   INSTALL='\$(..)./scripts/install-sh -c'
 554 fi
 555 AC_PROG_LN_S
 556
 557 LIBC_PROG_BINUTILS
 558
 559 # Accept binutils 2.25 or newer.
 560 libc_cv_with_lld=no
 561 case $($LD --version) in
 562   "GNU gold"*)
 563   # Accept gold 1.14 or higher
 564     AC_CHECK_PROG_VER(LD, $LD, --version,
 565                     [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
 566                     [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
 567                     LD=: critic_missing="$critic_missing GNU gold")
 568     ;;
 569   "LLD"*)
 570   # Accept LLD 13.0.0 or higher
 571     AC_CHECK_PROG_VER(LD, $LD, --version,
 572                     [LLD.* \([0-9][0-9]*\.[0-9.]*\)],
 573                     [1[3-9].*|[2-9][0-9].*],
 574                     LD=: critic_missing="$critic_missing LLD")
 575     libc_cv_with_lld=yes
 576     ;;
 577   *)
 578     AC_CHECK_PROG_VER(LD, $LD, --version,
 579                     [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 580                     [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 581                     LD=: critic_missing="$critic_missing GNU ld")
 582     ;;
 583 esac
 584 LIBC_CONFIG_VAR([with-lld], [$libc_cv_with_lld])
 585
 586 # These programs are version sensitive.
 587 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
 588   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
 589   [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
 590
 591 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
 592   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
 593   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
 594   MSGFMT=: aux_missing="$aux_missing msgfmt")
 595 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
 596   [GNU texinfo.* \([0-9][0-9.]*\)],
 597   [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
 598   MAKEINFO=: aux_missing="$aux_missing makeinfo")
 599 AC_CHECK_PROG_VER(SED, sed, --version,
 600   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
 601   [3.0[2-9]*|3.[1-9]*|[4-9]*],
 602   SED=: aux_missing="$aux_missing sed")
 603 AC_CHECK_PROG_VER(AWK, gawk, --version,
 604   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
 605   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
 606 AC_CHECK_PROG_VER(BISON, bison, --version,
 607   [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
 608   [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
 609
 610 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
 611 AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
 612 #if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
 613 #error insufficient compiler
 614 #endif]])],
 615                [libc_cv_compiler_ok=yes],
 616                [libc_cv_compiler_ok=no])])
 617 AS_IF([test $libc_cv_compiler_ok != yes],
 618       [critic_missing="$critic_missing compiler"])
 619
 620 if test "x$maintainer" = "xyes"; then
 621   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
 622   case "x$AUTOCONF" in
 623   xno|x|x:) AUTOCONF=no ;;
 624   *)
 625     AC_CACHE_CHECK(dnl
 626   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
 627     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
 628       libc_cv_autoconf_works=yes
 629     else
 630       libc_cv_autoconf_works=no
 631     fi])
 632     test $libc_cv_autoconf_works = yes || AUTOCONF=no
 633     ;;
 634   esac
 635   if test "x$AUTOCONF" = xno; then
 636     aux_missing="$aux_missing autoconf"
 637   fi
 638 else
 639   AUTOCONF=no
 640 fi
 641
 642 # Check for python3 if available, or else python.
 643 AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
 644   [Python \([0-9][0-9.]*\)],
 645   [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
 646   critic_missing="$critic_missing python")
 647 PYTHON="$PYTHON_PROG -B"
 648 AC_SUBST(PYTHON)
 649
 650 test -n "$critic_missing" && AC_MSG_ERROR([
 651 *** These critical programs are missing or too old:$critic_missing
 652 *** Check the INSTALL file for required versions.])
 653
 654 test -n "$aux_missing" && AC_MSG_WARN([
 655 *** These auxiliary programs are missing or incompatible versions:$aux_missing
 656 *** some features or tests will be disabled.
 657 *** Check the INSTALL file for required versions.])
 658
 659
 660 # Determine whether to use fpu or nofpu sysdeps directories.
 661 AC_CACHE_CHECK([for use of fpu sysdeps directories],
 662                libc_cv_with_fp, [dnl
 663 cat > conftest.c <<EOF
 664 #if $with_fp_cond
 665 int dummy;
 666 #else
 667 # error "no hardware floating point"
 668 #endif
 669 EOF
 670 libc_cv_with_fp=no
 671 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
 672    1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
 673   libc_cv_with_fp=yes
 674 fi
 675 rm -f conftest*])
 676 AC_SUBST(libc_cv_with_fp)
 677
 678 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
 679 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
 680                    [libc_cv_ssp=yes],
 681                    [libc_cv_ssp=no])
 682 ])
 683
 684 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
 685 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
 686                    [libc_cv_ssp_strong=yes],
 687                    [libc_cv_ssp_strong=no])
 688 ])
 689
 690 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
 691 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
 692                    [libc_cv_ssp_all=yes],
 693                    [libc_cv_ssp_all=no])
 694 ])
 695
 696 stack_protector=
 697 no_stack_protector=
 698 if test "$libc_cv_ssp" = yes; then
 699   no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
 700   AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
 701 fi
 702
 703 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
 704   stack_protector="-fstack-protector"
 705   AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
 706 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
 707   stack_protector="-fstack-protector-all"
 708   AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
 709 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
 710   stack_protector="-fstack-protector-strong"
 711   AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
 712 else
 713   stack_protector="-fno-stack-protector"
 714   AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
 715 fi
 716 AC_SUBST(libc_cv_ssp)
 717 AC_SUBST(stack_protector)
 718 AC_SUBST(no_stack_protector)
 719
 720 if test -n "$stack_protector"; then
 721   dnl Don't run configure tests with stack-protection on, to avoid problems with
 722   dnl bootstrapping.
 723   no_ssp=-fno-stack-protector
 724 else
 725   no_ssp=
 726
 727   if test "$enable_stack_protector" != no; then
 728     AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
 729   fi
 730 fi
 731
 732 # For the multi-arch option we need support in the assembler & linker.
 733 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 734                libc_cv_ld_gnu_indirect_function, [dnl
 735 cat > conftest.S <<EOF
 736 .type foo,%gnu_indirect_function
 737 foo:
 738 .globl _start
 739 _start:
 740 .globl __start
 741 __start:
 742 .data
 743 #ifdef _LP64
 744 .quad foo
 745 #else
 746 .long foo
 747 #endif
 748 EOF
 749 libc_cv_ld_gnu_indirect_function=no
 750 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
 751             -nostartfiles -nostdlib $no_ssp \
 752             -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
 753   # Do a link to see if the backend supports IFUNC relocs.
 754   $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
 755   LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
 756     libc_cv_ld_gnu_indirect_function=yes
 757   }
 758 fi
 759 rm -f conftest*])
 760
 761 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
 762 AC_CACHE_CHECK([for gcc attribute ifunc support],
 763                libc_cv_gcc_indirect_function, [dnl
 764 cat > conftest.c <<EOF
 765 extern int func (int);
 766 int used_func (int a)
 767 {
 768   return a;
 769 }
 770 static void *resolver ()
 771 {
 772   return &used_func;
 773 }
 774 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
 775 EOF
 776 libc_cv_gcc_indirect_function=no
 777 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
 778    2>&AS_MESSAGE_LOG_FD ; then
 779   if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
 780     libc_cv_gcc_indirect_function=yes
 781   fi
 782 fi
 783 rm -f conftest*])
 784
 785 # Check if linker supports textrel relocation with ifunc (used on elf/tests).
 786 # Note that it relies on libc_cv_ld_gnu_indirect_function test above.
 787 AC_CACHE_CHECK([whether the linker supports textrels along with ifunc],
 788                libc_cv_textrel_ifunc, [dnl
 789 cat > conftest.S <<EOF
 790 .type foo,%gnu_indirect_function
 791 foo:
 792 .globl _start
 793 _start:
 794 .globl __start
 795 __start:
 796 .data
 797 #ifdef _LP64
 798 .quad foo
 799 #else
 800 .long foo
 801 #endif
 802 .text
 803 .globl address
 804 address:
 805 #ifdef _LP64
 806 .quad address
 807 #else
 808 .long address
 809 #endif
 810 EOF
 811 libc_cv_textrel_ifunc=no
 812 if test $libc_cv_ld_gnu_indirect_function = yes; then
 813    if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp -pie -o conftest conftest.S); then
 814      libc_cv_textrel_ifunc=yes
 815    fi
 816 fi
 817 rm -f conftest*])
 818 AC_SUBST(libc_cv_textrel_ifunc)
 819
 820 # Check if CC supports attribute retain as it is used in attribute_used_retain macro.
 821 AC_CACHE_CHECK([for GNU attribute retain support],
 822                libc_cv_gnu_retain, [dnl
 823 cat > conftest.c <<EOF
 824 static int var  __attribute__ ((used, retain, section ("__libc_atexit")));
 825 EOF
 826 libc_cv_gnu_retain=no
 827 if ${CC-cc} -Werror -c conftest.c -o /dev/null 1>&AS_MESSAGE_LOG_FD \
 828    2>&AS_MESSAGE_LOG_FD ; then
 829   libc_cv_gnu_retain=yes
 830 fi
 831 rm -f conftest*])
 832 if test $libc_cv_gnu_retain = yes; then
 833   AC_DEFINE(HAVE_GNU_RETAIN)
 834 fi
 835 LIBC_CONFIG_VAR([have-gnu-retain], [$libc_cv_gnu_retain])
 836
 837 # Check if gcc warns about alias for function with incompatible types.
 838 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
 839                libc_cv_gcc_incompatible_alias, [dnl
 840 cat > conftest.c <<EOF
 841 int __redirect_foo (const void *s, int c);
 842
 843 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
 844 __typeof (__redirect_foo) *foo_impl (void)
 845 {
 846   return 0;
 847 }
 848
 849 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
 850 EOF
 851 libc_cv_gcc_incompatible_alias=yes
 852 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
 853   libc_cv_gcc_incompatible_alias=no
 854 fi
 855 rm -f conftest*])
 856
 857 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
 858   if test x"$multi_arch" = xyes; then
 859     AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
 860   else
 861     multi_arch=no
 862   fi
 863 fi
 864 if test x"$libc_cv_gcc_indirect_function" != xyes; then
 865   # GCC 8+ emits a warning for alias with incompatible types and it might
 866   # fail to build ifunc resolvers aliases to either weak or internal
 867   # symbols.  Disables multiarch build in this case.
 868   if test x"$libc_cv_gcc_incompatible_alias" = xyes; then
 869     AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
 870     if test x"$multi_arch" = xyes; then
 871       AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
 872     fi
 873     AC_MSG_WARN([Multi-arch is disabled.])
 874     multi_arch=no
 875   elif test x"$multi_arch" = xyes; then
 876     AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
 877 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
 878   fi
 879 fi
 880 multi_arch_d=
 881 if test x"$multi_arch" != xno; then
 882   multi_arch_d=/multiarch
 883 fi
 884
 885 # Compute the list of sysdep directories for this configuration.
 886 # This can take a while to compute.
 887 sysdep_dir=$srcdir/sysdeps
 888 AC_MSG_CHECKING(sysdep dirs)
 889 dnl We need to use [ and ] for other purposes for a while now.
 890 changequote(,)dnl
 891 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 892 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 893
 894 test "x$base_os" != x || case "$os" in
 895 gnu*)
 896   base_os=mach/hurd ;;
 897 linux*)
 898   base_os=unix/sysv ;;
 899 esac
 900
 901 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 902 tail=$os
 903 ostry=$os
 904 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 905   ostry="$ostry /$o"
 906   tail=$o
 907 done
 908 o=`echo $tail | sed 's/[0-9]*$//'`
 909 if test $o != $tail; then
 910   ostry="$ostry /$o"
 911 fi
 912 # For linux-gnu, try linux-gnu, then linux.
 913 o=`echo $tail | sed 's/-.*$//'`
 914 if test $o != $tail; then
 915   ostry="$ostry /$o"
 916 fi
 917
 918 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 919 base=
 920 tail=$base_os
 921 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 922   set $b
 923   base="$base /$1"
 924   tail="$2"
 925 done
 926
 927 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 928 mach=
 929 tail=$machine${submachine:+/$submachine}
 930 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 931   set $m
 932   # Prepend the machine's FPU directory unless the architecture specific
 933   # preconfigure disables it.
 934   if test "$libc_cv_with_fp" = yes; then
 935     maybe_fpu=/fpu
 936   else
 937     maybe_fpu=/nofpu
 938   fi
 939   # For each machine term, try it with and then without /multiarch.
 940   for try_fpu in $maybe_fpu ''; do
 941     for try_multi in $multi_arch_d ''; do
 942       mach="$mach /$1$try_fpu$try_multi"
 943     done
 944   done
 945   tail="$2"
 946 done
 947
 948 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 949 changequote([,])dnl
 950
 951 # Find what sysdep directories exist.
 952 sysnames=
 953 for b in $base ''; do
 954   for m0 in $mach ''; do
 955     for v in /$vendor ''; do
 956       test "$v" = / && continue
 957       for o in /$ostry ''; do
 958         test "$o" = / && continue
 959         for m in $mach ''; do
 960           try_suffix="$m0$b$v$o$m"
 961           if test -n "$try_suffix"; then
 962             try_srcdir="${srcdir}/"
 963             try="sysdeps$try_suffix"
 964             test -n "$enable_debug_configure" &&
 965             echo "$0 [DEBUG]: try $try" >&2
 966             if test -d "$try_srcdir$try"; then
 967               sysnames="$sysnames $try"
 968               { test -n "$o" || test -n "$b"; } && os_used=t
 969               { test -n "$m" || test -n "$m0"; } && machine_used=t
 970               case x${m0:-$m} in
 971               x*/$submachine) submachine_used=t ;;
 972               esac
 973             fi
 974           fi
 975         done
 976       done
 977     done
 978   done
 979 done
 980
 981 # If the assembler supports gnu_indirect_function symbol type and the
 982 # architecture supports multi-arch, we enable multi-arch by default.
 983 case $sysnames in
 984 *"$multi_arch_d"*)
 985   ;;
 986 *)
 987   test x"$multi_arch" = xdefault && multi_arch=no
 988   ;;
 989 esac
 990 if test x"$multi_arch" != xno; then
 991   AC_DEFINE(USE_MULTIARCH)
 992 fi
 993 AC_SUBST(multi_arch)
 994
 995 if test -z "$os_used" && test "$os" != none; then
 996   AC_MSG_ERROR(Operating system $os is not supported.)
 997 fi
 998 if test -z "$machine_used" && test "$machine" != none; then
 999   AC_MSG_ERROR(The $machine is not supported.)
1000 fi
1001 if test -z "$submachine_used" && test -n "$submachine"; then
1002   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
1003 fi
1004 AC_SUBST(submachine)
1005
1006 # We have now validated the configuration.
1007
1008 # Expand the list of system names into a full list of directories
1009 # from each element's parent name and Implies file (if present).
1010 set $sysnames
1011 names=
1012 while test $# -gt 0; do
1013   name=$1
1014   shift
1015
1016   case " $names " in *" $name "*)
1017     # Already in the list.
1018     continue
1019   esac
1020
1021   # Report each name as we discover it, so there is no long pause in output.
1022   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
1023
1024   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
1025
1026   case $name in
1027     /*) xsrcdir= ;;
1028     *)  xsrcdir=$srcdir/ ;;
1029   esac
1030   test -n "$enable_debug_configure" &&
1031   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
1032
1033   for implies_file in Implies Implies-before Implies-after; do
1034     implies_type=`echo $implies_file | sed s/-/_/`
1035     eval ${implies_type}=
1036     if test -f $xsrcdir$name/$implies_file; then
1037       # Collect more names from the `Implies' file (removing comments).
1038       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
1039       for x in $implied_candidate; do
1040         found=no
1041         if test -d $xsrcdir$name_base/$x; then
1042           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
1043           found=yes
1044         fi
1045         try="sysdeps/$x"
1046         try_srcdir=$srcdir/
1047         test -n "$enable_debug_configure" &&
1048          echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
1049         if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
1050         then
1051           eval "${implies_type}=\"\$${implies_type} \$try\""
1052           found=yes
1053         fi
1054         if test $found = no; then
1055           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
1056         fi
1057       done
1058     fi
1059   done
1060
1061   # Add NAME to the list of names.
1062   names="$names $name"
1063
1064   # Find the parent of NAME, using the empty string if it has none.
1065 changequote(,)dnl
1066   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
1067 changequote([,])dnl
1068
1069   test -n "$enable_debug_configure" &&
1070     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
1071 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
1072
1073   # Add the names implied by NAME, and NAME's parent (if it has one), to
1074   # the list of names to be processed (the argument list).  We prepend the
1075   # implied names to the list and append the parent.  We want implied
1076   # directories to come before further directories inferred from the
1077   # configuration components; this ensures that for sysv4, unix/common
1078   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
1079   # after sysv4).
1080   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
1081   test -n "$sysnames" && set $sysnames
1082 done
1083
1084 # Add the default directories.
1085 default_sysnames="sysdeps/generic"
1086 sysnames="$names $default_sysnames"
1087 AC_SUBST(sysnames)
1088 # The other names were emitted during the scan.
1089 AC_MSG_RESULT($default_sysnames)
1090
1091 # if using special system headers, find out the compiler's sekrit
1092 # header directory and add that to the list.  NOTE: Only does the right
1093 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
1094 if test -n "$sysheaders"; then
1095   SYSINCLUDES=-nostdinc
1096   for d in include include-fixed; do
1097     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1098     SYSINCLUDES="$SYSINCLUDES -isystem $i"
1099   done
1100   SYSINCLUDES="$SYSINCLUDES \
1101 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1102   if test -n "$CXX"; then
1103     CXX_SYSINCLUDES=
1104     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1105     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1106       test "x$cxxheaders" != x &&
1107       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1108     done
1109   fi
1110 fi
1111 AC_SUBST(SYSINCLUDES)
1112 AC_SUBST(CXX_SYSINCLUDES)
1113
1114 # Obtain some C++ header file paths.  This is used to make a local
1115 # copy of those headers in Makerules.
1116 if test -n "$CXX"; then
1117   find_cxx_header () {
1118     echo "#include <$1>" | $CXX -H -fsyntax-only -x c++ - 2>&1 \
1119          | $AWK '$1 == "."{print $2}'
1120   }
1121   CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1122   CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1123   CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1124 fi
1125 AC_SUBST(CXX_CSTDLIB_HEADER)
1126 AC_SUBST(CXX_CMATH_HEADER)
1127 AC_SUBST(CXX_BITS_STD_ABS_H)
1128
1129 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1130 # since this would lead to problems installing/building glibc.
1131 # LD_LIBRARY_PATH contains the current directory if one of the following
1132 # is true:
1133 # - one of the terminals (":" and ";") is the first or last sign
1134 # - two terminals occur directly after each other
1135 # - the path contains an element with a dot in it
1136 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1137 changequote(,)dnl
1138 case ${LD_LIBRARY_PATH} in
1139   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1140     ld_library_path_setting="contains current directory"
1141     ;;
1142   *)
1143     ld_library_path_setting="ok"
1144     ;;
1145 esac
1146 changequote([,])dnl
1147 AC_MSG_RESULT($ld_library_path_setting)
1148 if test "$ld_library_path_setting" != "ok"; then
1149 AC_MSG_ERROR([
1150 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1151 *** building glibc. Please change the environment variable
1152 *** and run configure again.])
1153 fi
1154
1155 AC_PATH_PROG(BASH_SHELL, bash, no)
1156
1157 AC_PATH_PROG(PERL, perl, no)
1158 if test "$PERL" != no &&
1159    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1160   PERL=no
1161 fi
1162 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1163              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1164
1165 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1166 cat > conftest.s <<EOF
1167 .text
1168 foo:
1169 .set glibc_conftest_frobozz,foo
1170 .globl glibc_conftest_frobozz
1171 EOF
1172 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1173 # (but it doesn't work), so we must do a linking check to be sure.
1174 cat > conftest1.c <<\EOF
1175 extern int glibc_conftest_frobozz;
1176 void _start() { glibc_conftest_frobozz = 1; }
1177 EOF
1178 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1179             -nostartfiles -nostdlib $no_ssp \
1180             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1181   libc_cv_asm_set_directive=yes
1182 else
1183   libc_cv_asm_set_directive=no
1184 fi
1185 rm -f conftest*])
1186 if test $libc_cv_asm_set_directive = yes; then
1187   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1188 fi
1189
1190 AC_CACHE_CHECK(linker support for protected data symbol,
1191                libc_cv_protected_data,
1192                [cat > conftest.c <<EOF
1193                 int bar __attribute__ ((visibility ("protected"))) = 1;
1194 EOF
1195                 libc_cv_protected_data=no
1196                 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1197                   cat > conftest.c <<EOF
1198                   extern int bar;
1199                   int main (void) { return bar; }
1200 EOF
1201                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1202                     libc_cv_protected_data=yes
1203                   fi
1204                 fi
1205                 rm -f conftest.*
1206                ])
1207 AC_SUBST(libc_cv_protected_data)
1208
1209 AC_CACHE_CHECK(linker support for INSERT in linker script,
1210                libc_cv_insert,
1211                [cat > conftest.c <<EOF
1212                 int __attribute__ ((section(".bar"))) bar = 0x12345678;
1213                 int test (void) { return bar; }
1214 EOF
1215                 cat > conftest.t <<EOF
1216                 SECTIONS
1217                 {
1218                   .bar : { *(.bar) }
1219                 }
1220                 INSERT AFTER .rela.dyn;
1221 EOF
1222                 libc_cv_insert=no
1223                 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1224                   libc_cv_insert=yes
1225                 fi
1226                 rm -f conftest.*
1227                ])
1228 AC_SUBST(libc_cv_insert)
1229
1230 AC_CACHE_CHECK(for broken __attribute__((alias())),
1231                libc_cv_broken_alias_attribute,
1232                [cat > conftest.c <<EOF
1233                extern int foo (int x) __asm ("xyzzy");
1234                int bar (int x) { return x; }
1235                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1236                extern int dfoo;
1237                extern __typeof (dfoo) dfoo __asm ("abccb");
1238                int dfoo = 1;
1239 EOF
1240                libc_cv_broken_alias_attribute=yes
1241                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1242                  if grep 'xyzzy' conftest.s >/dev/null &&
1243                     grep 'abccb' conftest.s >/dev/null; then
1244                    libc_cv_broken_alias_attribute=no
1245                  fi
1246                fi
1247                rm -f conftest.c conftest.s
1248                ])
1249 if test $libc_cv_broken_alias_attribute = yes; then
1250   AC_MSG_ERROR(working alias attribute support required)
1251 fi
1252
1253 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1254                libc_cv_have_sdata_section,
1255                [echo "int i;" > conftest.c
1256                 libc_cv_have_sdata_section=no
1257                 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1258                    | grep '\.sdata' >/dev/null; then
1259                   libc_cv_have_sdata_section=yes
1260                 fi
1261                 rm -f conftest.c conftest.so
1262                ])
1263 if test $libc_cv_have_sdata_section = yes; then
1264   AC_DEFINE(HAVE_SDATA_SECTION)
1265 fi
1266
1267 AC_CACHE_CHECK(for libunwind-support in compiler,
1268                libc_cv_cc_with_libunwind, [
1269   cat > conftest.c <<EOF
1270 int main (void) { return 0; }
1271 EOF
1272   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1273      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1274     libc_cv_cc_with_libunwind=yes
1275   else
1276     libc_cv_cc_with_libunwind=no
1277   fi
1278   rm -f conftest*])
1279 AC_SUBST(libc_cv_cc_with_libunwind)
1280 if test $libc_cv_cc_with_libunwind = yes; then
1281   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1282 fi
1283
1284 ASFLAGS_config=
1285 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1286                libc_cv_as_noexecstack, [dnl
1287 cat > conftest.c <<EOF
1288 void foo (void) { }
1289 EOF
1290 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1291                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1292    && grep .note.GNU-stack conftest.s >/dev/null \
1293    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1294                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1295 then
1296   libc_cv_as_noexecstack=yes
1297 else
1298   libc_cv_as_noexecstack=no
1299 fi
1300 rm -f conftest*])
1301 if test $libc_cv_as_noexecstack = yes; then
1302   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1303 fi
1304 AC_SUBST(ASFLAGS_config)
1305
1306 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1307                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1308 AC_SUBST(libc_cv_z_execstack)
1309
1310 LIBC_LINKER_FEATURE([-z start-stop-gc], [-Wl,-z,start-stop-gc],
1311                     [libc_cv_z_start_stop_gc=yes], [libc_cv_z_start_stop_gc=no])
1312 LIBC_CONFIG_VAR([have-z-start-stop-gc], [$libc_cv_z_start_stop_gc])
1313
1314 LIBC_LINKER_FEATURE([--depaudit], [-Wl,--depaudit,x],
1315                     [libc_cv_depaudit=yes], [libc_cv_depaudit=no])
1316 LIBC_CONFIG_VAR([have-depaudit], [$libc_cv_depaudit])
1317
1318 LIBC_LINKER_FEATURE([-z pack-relative-relocs],
1319                     [-Wl,-z,pack-relative-relocs],
1320                     [libc_cv_dt_relr=yes], [libc_cv_dt_relr=no])
1321 LIBC_CONFIG_VAR([have-dt-relr], [$libc_cv_dt_relr])
1322
1323 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1324                     [-Wl,--no-dynamic-linker],
1325                     [libc_cv_no_dynamic_linker=yes],
1326                     [libc_cv_no_dynamic_linker=no])
1327 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1328
1329 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1330 LIBC_TRY_CC_OPTION([-static-pie],
1331                    [libc_cv_static_pie=yes],
1332                    [libc_cv_static_pie=no])
1333 ])
1334 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1335
1336 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1337 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1338 ])
1339
1340 AC_SUBST(libc_cv_fpie)
1341
1342 AC_CACHE_CHECK(for GLOB_DAT reloc,
1343                libc_cv_has_glob_dat, [dnl
1344 cat > conftest.c <<EOF
1345 extern int mumble;
1346 int foo (void) { return mumble; }
1347 EOF
1348 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1349                         -fPIC -shared -o conftest.so conftest.c
1350                         -nostdlib -nostartfiles $no_ssp
1351                         1>&AS_MESSAGE_LOG_FD])
1352 then
1353 dnl look for GLOB_DAT relocation.
1354   if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1355     libc_cv_has_glob_dat=yes
1356   else
1357     libc_cv_has_glob_dat=no
1358   fi
1359 else
1360   libc_cv_has_glob_dat=no
1361 fi
1362 rm -f conftest*])
1363 AC_SUBST(libc_cv_has_glob_dat)
1364
1365 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1366 [dnl
1367 cat > conftest.c <<EOF
1368 __thread int i;
1369 void foo (void)
1370 {
1371   i = 10;
1372 }
1373 EOF
1374 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=gnu2 -nostdlib -nostartfiles
1375                    conftest.c -o conftest 1>&AS_MESSAGE_LOG_FD])
1376 then
1377   libc_cv_mtls_dialect_gnu2=yes
1378 else
1379   libc_cv_mtls_dialect_gnu2=no
1380 fi
1381 rm -f conftest*])
1382 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1383 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1384
1385 dnl clang emits an warning for a double alias redirection, to warn the
1386 dnl original symbol is sed even when weak definition overrides it.
1387 dnl It is a usual pattern for weak_alias, where multiple alias point to
1388 dnl same symbol.
1389 AC_CACHE_CHECK([if -Wno-ignored-attributes is required for aliases],
1390                libc_cv_wno_ignored_attributes, [dnl
1391 cat > conftest.c <<EOF
1392 void __foo (void)
1393 {
1394 }
1395 extern __typeof (__foo) foo __attribute__ ((weak, alias ("__foo")));
1396 extern __typeof (__foo) bar __attribute__ ((weak, alias ("foo")));
1397 EOF
1398 libc_cv_wno_ignored_attributes=""
1399 if ! AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c])
1400 then
1401   libc_cv_wno_ignored_attributes="-Wno-ignored-attributes"
1402 fi
1403 rm -f conftest*])
1404 LIBC_CONFIG_VAR([config-cflags-wno-ignored-attributes],
1405                 [$libc_cv_wno_ignored_attributes])
1406
1407 AC_CACHE_CHECK(whether cc puts quotes around section names,
1408                libc_cv_have_section_quotes,
1409                [cat > conftest.c <<EOF
1410                 static const int foo
1411                 __attribute__ ((section ("bar"))) = 1;
1412 EOF
1413                 if ${CC-cc} -S conftest.c -o conftest.s; then
1414                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1415                     libc_cv_have_section_quotes=yes
1416                   else
1417                     libc_cv_have_section_quotes=no
1418                   fi
1419                 else
1420                   libc_cv_have_section_quotes=unknown
1421                 fi
1422                 rm -f conftest.{c,s}
1423                 ])
1424 if test $libc_cv_have_section_quotes = yes; then
1425   AC_DEFINE(HAVE_SECTION_QUOTES)
1426 fi
1427
1428 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1429 cat > conftest.c <<\EOF
1430 void zero (void *x)
1431 {
1432   __builtin_memset (x, 0, 1000);
1433 }
1434 EOF
1435 dnl
1436 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1437 then
1438   libc_cv_gcc_builtin_memset=no
1439 else
1440   libc_cv_gcc_builtin_memset=yes
1441 fi
1442 rm -f conftest* ])
1443 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1444   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1445 fi
1446
1447 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1448 cat > conftest.c <<\EOF
1449 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1450 char *foo (const char *a, const char *b)
1451 {
1452   return __builtin_strstr (a, b);
1453 }
1454 EOF
1455 dnl
1456 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1457 then
1458   libc_cv_gcc_builtin_redirection=yes
1459 else
1460   libc_cv_gcc_builtin_redirection=no
1461 fi
1462 rm -f conftest* ])
1463 if test "$libc_cv_gcc_builtin_redirection" = no; then
1464   AC_MSG_ERROR([support for the symbol redirection needed])
1465 fi
1466
1467 dnl Determine how to disable generation of FMA instructions.
1468 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1469                libc_cv_cc_nofma, [dnl
1470 libc_cv_cc_nofma=
1471 for opt in -ffp-contract=off -mno-fused-madd; do
1472   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1473 done])
1474 AC_SUBST(libc_cv_cc_nofma)
1475
1476 if test -n "$submachine"; then
1477   AC_CACHE_CHECK([for compiler option for CPU variant],
1478                  libc_cv_cc_submachine, [dnl
1479   libc_cv_cc_submachine=no
1480   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1481     LIBC_TRY_CC_OPTION([$opt], [
1482       libc_cv_cc_submachine="$opt"
1483       break], [])
1484   done])
1485   if test "x$libc_cv_cc_submachine" = xno; then
1486     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1487   fi
1488 fi
1489 AC_SUBST(libc_cv_cc_submachine)
1490
1491 dnl Determine if compiler supports -fsignaling-nans
1492 AC_CACHE_CHECK([for compiler option that -fsignaling-nans],
1493                libc_cv_cc_signaling_nans, [dnl
1494 LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans],
1495                    [libc_cv_cc_signaling_nans=-fsignaling-nans],
1496                    [libc_cv_cc_signaling_nans=])
1497 ])
1498 LIBC_CONFIG_VAR([config-cflags-signaling-nans],
1499                 [$libc_cv_cc_signaling_nans])
1500
1501 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1502 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1503 cat > conftest.c <<EOF
1504 void
1505 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1506 foo (void) {}
1507 EOF
1508 libc_cv_cc_loop_to_function=no
1509 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1510 then
1511   libc_cv_cc_loop_to_function=yes
1512 fi
1513 rm -f conftest*])
1514 if test $libc_cv_cc_loop_to_function = yes; then
1515   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1516 fi
1517 AC_SUBST(libc_cv_cc_loop_to_function)
1518
1519 dnl Check whether we have the gd library available.
1520 AC_MSG_CHECKING(for libgd)
1521 if test "$with_gd" != "no"; then
1522   old_CFLAGS="$CFLAGS"
1523   CFLAGS="$CFLAGS $libgd_include"
1524   old_LDFLAGS="$LDFLAGS"
1525   LDFLAGS="$LDFLAGS $libgd_ldflags"
1526   old_LIBS="$LIBS"
1527   LIBS="$LIBS -lgd -lpng -lz -lm"
1528   AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <gd.h>]], [[gdImagePng (0, 0)]])],
1529                  [LIBGD=yes], [LIBGD=no])
1530   CFLAGS="$old_CFLAGS"
1531   LDFLAGS="$old_LDFLAGS"
1532   LIBS="$old_LIBS"
1533 else
1534   LIBGD=no
1535 fi
1536 AC_MSG_RESULT($LIBGD)
1537 AC_SUBST(LIBGD)
1538
1539 # SELinux detection
1540 if test x$with_selinux = xno ; then
1541   have_selinux=no;
1542 else
1543   # See if we have the SELinux library
1544   AC_CHECK_LIB(selinux, is_selinux_enabled,
1545                have_selinux=yes, have_selinux=no)
1546   if test x$with_selinux = xyes ; then
1547     if test x$have_selinux = xno ; then
1548       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1549     fi
1550   fi
1551 fi
1552 # Check if we're building with SELinux support.
1553 if test "x$have_selinux" = xyes; then
1554   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1555
1556   # See if we have the libaudit library
1557   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1558                have_libaudit=yes, have_libaudit=no)
1559   if test "x$have_libaudit" = xyes; then
1560     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1561   fi
1562   AC_SUBST(have_libaudit)
1563
1564   # See if we have the libcap library
1565   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1566   if test "x$have_libcap" = xyes; then
1567     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1568   fi
1569   AC_SUBST(have_libcap)
1570 fi
1571 AC_SUBST(have_selinux)
1572
1573 dnl Check if we support the requested _FORTIFY_SOURCE level
1574 dnl If not, then don't use it.
1575 dnl Note that _FORTIFY_SOURCE may have been set through FLAGS too.
1576 dnl _FORTIFY_SOURCE value will be selectively disabled for function that can't
1577 dnl support it
1578 no_fortify_source="-Wp,-U_FORTIFY_SOURCE"
1579 fortify_source="${no_fortify_source}"
1580
1581 AC_CACHE_CHECK([for __builtin_dynamic_object_size], [libc_cv___builtin_dynamic_object_size], [
1582     AC_LINK_IFELSE([AC_LANG_PROGRAM([], [__builtin_dynamic_object_size("", 0)])],
1583         [libc_cv___builtin_dynamic_object_size=yes
1584          AS_IF([test "$enable_fortify_source" = yes], [enable_fortify_source=3])],
1585         [libc_cv___builtin_dynamic_object_size=no
1586          AS_IF([test "$enable_fortify_source" = yes], [enable_fortify_source=2])])
1587 ])
1588
1589 AS_CASE([$enable_fortify_source],
1590         [1|2], [libc_cv_fortify_source=yes],
1591         [3], [AS_IF([test "$libc_cv___builtin_dynamic_object_size" = yes],
1592                     [libc_cv_fortify_source=yes],
1593                     [AC_MSG_ERROR([Compiler doesn't provide necessary support for _FORTIFY_SOURCE=3])])],
1594         [libc_cv_fortify_source=no])
1595
1596 AS_IF([test "$libc_cv_fortify_source" = yes],
1597       [fortify_source="${fortify_source},-D_FORTIFY_SOURCE=${enable_fortify_source}"]
1598       )
1599
1600 AC_SUBST(enable_fortify_source)
1601 AC_SUBST(libc_cv_fortify_source)
1602 AC_SUBST(no_fortify_source)
1603 AC_SUBST(fortify_source)
1604
1605 dnl Starting with binutils 2.35, GAS can attach multiple symbol versions
1606 dnl to one symbol (PR 23840).
1607 AC_CACHE_CHECK(whether the assembler requires one version per symbol,
1608                libc_cv_symver_needs_alias, [dnl
1609   cat > conftest.s <<EOF
1610         .text
1611 testfunc:
1612         .globl testfunc
1613         .symver testfunc, testfunc1@VERSION1
1614         .symver testfunc, testfunc1@VERSION2
1615 EOF
1616   libc_cv_symver_needs_alias=no
1617   if ${CC-cc} $ASFLAGS -c conftest.s 2>&AS_MESSAGE_LOG_FD; then
1618     libc_cv_symver_needs_alias=no
1619   else
1620     libc_cv_symver_needs_alias=yes
1621   fi
1622   rm conftest.*
1623 ])
1624 if test "$libc_cv_symver_needs_alias" = yes; then
1625   AC_DEFINE(SYMVER_NEEDS_ALIAS)
1626 fi
1627
1628 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1629                libc_cv_builtin_trap, [dnl
1630 libc_cv_builtin_trap=no
1631 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[__builtin_trap ()]])],[
1632 libc_undefs=`$NM -u conftest.o |
1633   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1634     2>&AS_MESSAGE_LOG_FD` || {
1635   AC_MSG_ERROR([confusing output from $NM -u])
1636 }
1637 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1638 if test -z "$libc_undefs"; then
1639   libc_cv_builtin_trap=yes
1640 fi],[])])
1641 if test $libc_cv_builtin_trap = yes; then
1642   AC_DEFINE([HAVE_BUILTIN_TRAP])
1643 fi
1644
1645 dnl C++ feature tests.
1646 AC_LANG_PUSH([C++])
1647
1648 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1649                libc_cv_cxx_thread_local, [
1650 old_CXXFLAGS="$CXXFLAGS"
1651 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1652 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1653 #include <thread>
1654
1655 // Compiler support.
1656 struct S
1657 {
1658   S ();
1659   ~S ();
1660 };
1661 thread_local S s;
1662 S * get () { return &s; }
1663
1664 // libstdc++ support.
1665 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1666 #error __cxa_thread_atexit_impl not supported
1667 #endif
1668 ])],
1669                [libc_cv_cxx_thread_local=yes],
1670                [libc_cv_cxx_thread_local=no])
1671 CXXFLAGS="$old_CXXFLAGS"
1672 ])
1673 AC_SUBST(libc_cv_cxx_thread_local)
1674
1675 AC_LANG_POP([C++])
1676 dnl End of C++ feature tests.
1677
1678 ### End of automated tests.
1679 ### Now run sysdeps configure fragments.
1680
1681 # They also can set these variables.
1682 use_ldconfig=no
1683 ldd_rewrite_script=no
1684 libc_cv_sysconfdir=$sysconfdir
1685 libc_cv_localstatedir=$localstatedir
1686 libc_cv_gcc_unwind_find_fde=no
1687 libc_cv_idn=no
1688 pthread_in_libc=yes
1689
1690 # Iterate over all the sysdep directories we will use, running their
1691 # configure fragments.
1692 for dir in $sysnames; do
1693   case $dir in
1694     /*) dest=$dir ;;
1695     *)  dest=$srcdir/$dir ;;
1696   esac
1697   if test -r $dest/configure; then
1698     AC_MSG_RESULT(running configure fragment for $dir)
1699     . $dest/configure
1700   fi
1701 done
1702
1703 if test x"$build_mathvec" = xnotset; then
1704   build_mathvec=no
1705 fi
1706 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1707
1708 AC_SUBST(libc_extra_cflags)
1709 AC_SUBST(libc_extra_cppflags)
1710
1711 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1712   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1713 fi
1714 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1715
1716 # A sysdeps configure fragment can reset this if IFUNC is not actually
1717 # usable even though the assembler knows how to generate the symbol type.
1718 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1719   AC_DEFINE(HAVE_IFUNC)
1720 fi
1721 LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
1722
1723 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1724   AC_DEFINE(HAVE_GCC_IFUNC)
1725 fi
1726 LIBC_CONFIG_VAR([have-gcc-ifunc], [$libc_cv_gcc_indirect_function])
1727
1728 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1729 # configure fragment can override the value to prevent this AC_DEFINE.
1730 AC_SUBST(use_nscd)
1731 if test "x$use_nscd" != xno; then
1732   AC_DEFINE([USE_NSCD])
1733 fi
1734 if test "x$build_nscd" = xdefault; then
1735   build_nscd=$use_nscd
1736 fi
1737
1738 AC_SUBST(libc_cv_slibdir)
1739 AC_SUBST(libc_cv_rtlddir)
1740 AC_SUBST(libc_cv_complocaledir)
1741 AC_SUBST(libc_cv_sysconfdir)
1742 AC_SUBST(libc_cv_localstatedir)
1743 AC_SUBST(libc_cv_rootsbindir)
1744
1745 if test x$use_ldconfig = xyes; then
1746   AC_DEFINE(USE_LDCONFIG)
1747 fi
1748 AC_SUBST(use_ldconfig)
1749 AC_SUBST(ldd_rewrite_script)
1750
1751 AC_SUBST(static)
1752 AC_SUBST(shared)
1753
1754 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1755 [libc_cv_pic_default=yes
1756 cat > conftest.c <<EOF
1757 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1758 # error PIC is default.
1759 #endif
1760 EOF
1761 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1762   libc_cv_pic_default=no
1763 fi
1764 rm -f conftest.*])
1765 LIBC_CONFIG_VAR([build-pic-default], [$libc_cv_pic_default])
1766
1767 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1768 [libc_cv_cc_pie_default=yes
1769 cat > conftest.c <<EOF
1770 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1771 # error PIE is default.
1772 #endif
1773 EOF
1774 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1775   libc_cv_cc_pie_default=no
1776 fi
1777 rm -f conftest.*])
1778 LIBC_CONFIG_VAR([cc-pie-default], [$libc_cv_cc_pie_default])
1779
1780 AC_MSG_CHECKING(if we can build programs as PIE)
1781 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifdef PIE_UNSUPPORTED
1782 # error PIE is not supported
1783 #endif]])], [libc_cv_pie_supported=yes], [libc_cv_pie_supported=no])
1784 AC_MSG_RESULT($libc_cv_pie_supported)
1785 # Disable build-pie-default if target does not support it or glibc is
1786 # configured with --disable-default-pie.
1787 if test "x$default_pie" = xno; then
1788   build_pie_default=no
1789 else
1790   build_pie_default=$libc_cv_pie_supported
1791 fi
1792 LIBC_CONFIG_VAR([build-pie-default], [$build_pie_default])
1793
1794 AC_MSG_CHECKING(if we can build static PIE programs)
1795 libc_cv_static_pie_supported=$libc_cv_pie_supported
1796 if test "x$libc_cv_pie_supported" != xno \
1797    -a "$libc_cv_no_dynamic_linker" = yes; then
1798   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifndef SUPPORT_STATIC_PIE
1799 # error static PIE is not supported
1800 #endif]])], [libc_cv_static_pie_supported=yes],
1801             [libc_cv_static_pie_supported=no])
1802 fi
1803 AC_MSG_RESULT($libc_cv_static_pie_supported)
1804
1805 # Enable static-pie only if it is available and glibc isn't configured
1806 # with --disable-default-pie.
1807 if test "x$default_pie" = xno; then
1808   libc_cv_static_pie=no
1809 else
1810   libc_cv_static_pie=$libc_cv_static_pie_supported
1811 fi
1812 if test "$libc_cv_static_pie" = "yes"; then
1813   AC_DEFINE(ENABLE_STATIC_PIE)
1814 fi
1815 LIBC_CONFIG_VAR([enable-static-pie], [$libc_cv_static_pie])
1816
1817 # Set the `multidir' variable by grabbing the variable from the compiler.
1818 # We do it once and save the result in a generated makefile.
1819 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1820 AC_SUBST(libc_cv_multidir)
1821
1822 AC_SUBST(profile)
1823 AC_SUBST(static_nss)
1824
1825 AC_SUBST(DEFINES)
1826
1827 dnl See sysdeps/mach/configure.ac for this variable.
1828 AC_SUBST(mach_interface_list)
1829
1830 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1831 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1832 AC_SUBST(VERSION)
1833 AC_SUBST(RELEASE)
1834
1835 if test "$pthread_in_libc" = yes; then
1836   AC_DEFINE(PTHREAD_IN_LIBC)
1837 fi
1838 AC_SUBST(pthread_in_libc)
1839
1840 AC_CONFIG_FILES([config.make Makefile])
1841 AC_CONFIG_COMMANDS([default],[[
1842 case $CONFIG_FILES in *config.make*)
1843 echo "$config_vars" >> config.make;;
1844 esac
1845 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1846 AC_OUTPUT