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Diffstat (limited to 'REORG.TODO/configure.ac')
| -rw-r--r-- | REORG.TODO/configure.ac | 1944 |
1 files changed, 1944 insertions, 0 deletions
diff --git a/REORG.TODO/configure.ac b/REORG.TODO/configure.ac new file mode 100644 index 0000000000..7f430425ae --- /dev/null +++ b/REORG.TODO/configure.ac @@ -0,0 +1,1944 @@ +dnl Process this file with autoconf to produce a configure script. +dnl Note we do not use AC_PREREQ here! See aclocal.m4 for what we use instead. +AC_INIT([GNU C Library], [(see version.h)], [http://sourceware.org/bugzilla/], [glibc]) +AC_CONFIG_SRCDIR([include/features.h]) +AC_CONFIG_HEADERS([config.h]) +AC_CONFIG_AUX_DIR([scripts]) + +ACX_PKGVERSION([GNU libc]) +ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html]) +AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"], + [Package description]) +AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"], + [Bug reporting address]) + +# Glibc should not depend on any header files +AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS], + [m4_divert_text([DEFAULTS], + [ac_includes_default='/* none */'])]) + +# We require GCC, and by default use its preprocessor. Override AC_PROG_CPP +# here to work around the Autoconf issue discussed in +# <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>. +AC_DEFUN([AC_PROG_CPP], +[AC_REQUIRE([AC_PROG_CC])dnl +AC_ARG_VAR([CPP], [C preprocessor])dnl +_AC_ARG_VAR_CPPFLAGS()dnl +# On Suns, sometimes $CPP names a directory. +if test -n "$CPP" && test -d "$CPP"; then + CPP= +fi +if test -z "$CPP"; then + CPP="$CC -E" +fi +AC_SUBST(CPP)dnl +])# AC_PROG_CPP + +# We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf +# issue discussed in +# <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>. +AC_DEFUN([_AC_PROG_CC_C89], [[$1]]) + +dnl This is here so we can set $subdirs directly based on configure fragments. +AC_CONFIG_SUBDIRS() + +AC_CANONICAL_HOST + +AC_PROG_CC +if test $host != $build; then + AC_CHECK_PROGS(BUILD_CC, gcc cc) +fi +AC_SUBST(cross_compiling) +AC_PROG_CPP +AC_CHECK_TOOL(READELF, readelf, false) + +# We need the C++ compiler only for testing. +AC_PROG_CXX +# It's useless to us if it can't link programs (e.g. missing -lstdc++). +AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl +AC_LANG_PUSH([C++]) +# Default, dynamic case. +AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], + [libc_cv_cxx_link_ok=yes], + [libc_cv_cxx_link_ok=no]) +# Static case. +old_LDFLAGS="$LDFLAGS" +LDFLAGS="$LDFLAGS -static" +AC_LINK_IFELSE([AC_LANG_SOURCE([ +#include <iostream> + +int +main() +{ + std::cout << "Hello, world!"; + return 0; +} +])], + [], + [libc_cv_cxx_link_ok=no]) +LDFLAGS="$old_LDFLAGS" +AC_LANG_POP([C++])]) +AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=]) + +if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then + AC_MSG_ERROR([you must configure in a separate build directory]) +fi + +# This will get text that should go into config.make. +config_vars= + +# Check for a --with-gd argument and set libgd-LDFLAGS in config.make. +AC_ARG_WITH([gd], + AC_HELP_STRING([--with-gd=DIR], + [find libgd include dir and library with prefix DIR]), + [dnl +case "$with_gd" in +yes|''|no) ;; +*) libgd_include="-I$withval/include" + libgd_ldflags="-L$withval/lib" ;; +esac +]) +AC_ARG_WITH([gd-include], + AC_HELP_STRING([--with-gd-include=DIR], + [find libgd include files in DIR]), + [dnl +case "$with_gd_include" in +''|no) ;; +*) libgd_include="-I$withval" ;; +esac +]) +AC_ARG_WITH([gd-lib], + AC_HELP_STRING([--with-gd-lib=DIR], + [find libgd library files in DIR]), + [dnl +case "$with_gd_lib" in +''|no) ;; +*) libgd_ldflags="-L$withval" ;; +esac +]) + +if test -n "$libgd_include"; then + config_vars="$config_vars +CFLAGS-memusagestat.c = $libgd_include" +fi +if test -n "$libgd_ldflags"; then + config_vars="$config_vars +libgd-LDFLAGS = $libgd_ldflags" +fi + +dnl Arguments to specify presence of other packages/features. +AC_ARG_WITH([fp], + AC_HELP_STRING([--with-fp], + [if using floating-point hardware @<:@default=yes@:>@]), + [with_fp=$withval], + [with_fp=yes]) +AC_SUBST(with_fp) +AC_ARG_WITH([binutils], + AC_HELP_STRING([--with-binutils=PATH], + [specify location of binutils (as and ld)]), + [path_binutils=$withval], + [path_binutils='']) +AC_ARG_WITH([selinux], + AC_HELP_STRING([--with-selinux], + [if building with SELinux support]), + [with_selinux=$withval], + [with_selinux=auto]) + +AC_ARG_WITH([headers], + AC_HELP_STRING([--with-headers=PATH], + [location of system headers to use + (for example /usr/src/linux/include) + @<:@default=compiler default@:>@]), + [sysheaders=$withval], + [sysheaders='']) +AC_SUBST(sysheaders) + +AC_SUBST(use_default_link) +AC_ARG_WITH([default-link], + AC_HELP_STRING([--with-default-link], + [do not use explicit linker scripts]), + [use_default_link=$withval], + [use_default_link=default]) + +AC_ARG_ENABLE([sanity-checks], + AC_HELP_STRING([--disable-sanity-checks], + [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]), + [enable_sanity=$enableval], + [enable_sanity=yes]) + +AC_ARG_ENABLE([shared], + AC_HELP_STRING([--enable-shared], + [build shared library @<:@default=yes if GNU ld@:>@]), + [shared=$enableval], + [shared=yes]) +AC_ARG_ENABLE([profile], + AC_HELP_STRING([--enable-profile], + [build profiled library @<:@default=no@:>@]), + [profile=$enableval], + [profile=no]) +AC_ARG_ENABLE([timezone-tools], + AC_HELP_STRING([--disable-timezone-tools], + [do not install timezone tools @<:@default=install@:>@]), + [enable_timezone_tools=$enableval], + [enable_timezone_tools=yes]) +AC_SUBST(enable_timezone_tools) + +AC_ARG_ENABLE([hardcoded-path-in-tests], + AC_HELP_STRING([--enable-hardcoded-path-in-tests], + [hardcode newly built glibc path in tests @<:@default=no@:>@]), + [hardcoded_path_in_tests=$enableval], + [hardcoded_path_in_tests=no]) +AC_SUBST(hardcoded_path_in_tests) + +AC_ARG_ENABLE([stackguard-randomization], + AC_HELP_STRING([--enable-stackguard-randomization], + [initialize __stack_chk_guard canary with a random number at program start]), + [enable_stackguard_randomize=$enableval], + [enable_stackguard_randomize=no]) +if test "$enable_stackguard_randomize" = yes; then + AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE) +fi + +AC_ARG_ENABLE([lock-elision], + AC_HELP_STRING([--enable-lock-elision[=yes/no]], + [Enable lock elision for pthread mutexes by default]), + [enable_lock_elision=$enableval], + [enable_lock_elision=no]) +AC_SUBST(enable_lock_elision) +if test "$enable_lock_elision" = yes ; then + AC_DEFINE(ENABLE_LOCK_ELISION) +fi + +dnl Generic infrastructure for drop-in additions to libc. +AC_ARG_ENABLE([add-ons], + AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@], + [configure and build add-ons in DIR1,DIR2,... + search for add-ons if no parameter given]), + , [enable_add_ons=yes]) + +AC_ARG_ENABLE([hidden-plt], + AC_HELP_STRING([--disable-hidden-plt], + [do not hide internal function calls to avoid PLT]), + [hidden=$enableval], + [hidden=yes]) +if test "x$hidden" = xno; then + AC_DEFINE(NO_HIDDEN) +fi + +AC_ARG_ENABLE([bind-now], + AC_HELP_STRING([--enable-bind-now], + [disable lazy relocations in DSOs]), + [bindnow=$enableval], + [bindnow=no]) +AC_SUBST(bindnow) +if test "x$bindnow" = xyes; then + AC_DEFINE(BIND_NOW) +fi + +dnl Build glibc with -fstack-protector, -fstack-protector-all, or +dnl -fstack-protector-strong. +AC_ARG_ENABLE([stack-protector], + AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@], + [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]), + [enable_stack_protector=$enableval], + [enable_stack_protector=no]) +case "$enable_stack_protector" in +all|yes|no|strong) ;; +*) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);; +esac + +dnl On some platforms we cannot use dynamic loading. We must provide +dnl static NSS modules. +AC_ARG_ENABLE([static-nss], + AC_HELP_STRING([--enable-static-nss], + [build static NSS modules @<:@default=no@:>@]), + [static_nss=$enableval], + [static_nss=no]) +dnl Enable static NSS also if we build no shared objects. +if test x"$static_nss" = xyes || test x"$shared" = xno; then + static_nss=yes + AC_DEFINE(DO_STATIC_NSS) +fi + +AC_ARG_ENABLE([force-install], + AC_HELP_STRING([--disable-force-install], + [don't force installation of files from this package, even if they are older than the installed files]), + [force_install=$enableval], + [force_install=yes]) +AC_SUBST(force_install) + +AC_ARG_ENABLE([maintainer-mode], + AC_HELP_STRING([--enable-maintainer-mode], + [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]), + [maintainer=$enableval], + [maintainer=no]) + +dnl On some platforms we allow dropping compatibility with all kernel +dnl versions. +AC_ARG_ENABLE([kernel], + AC_HELP_STRING([--enable-kernel=VERSION], + [compile for compatibility with kernel not older than VERSION]), + [minimum_kernel=$enableval], + []) +dnl Prevent unreasonable values. +if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then + # Better nothing than this. + minimum_kernel="" +else + if test "$minimum_kernel" = current; then + minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel= + fi +fi + +dnl For the development we sometimes want gcc to issue even more warnings. +dnl This is not the default since many of the extra warnings are not +dnl appropriate. +AC_ARG_ENABLE([all-warnings], + AC_HELP_STRING([--enable-all-warnings], + [enable all useful warnings gcc can issue]), + [all_warnings=$enableval], + []) +AC_SUBST(all_warnings) + +AC_ARG_ENABLE([werror], + AC_HELP_STRING([--disable-werror], + [do not build with -Werror]), + [enable_werror=$enableval], + [enable_werror=yes]) +AC_SUBST(enable_werror) + +AC_ARG_ENABLE([multi-arch], + AC_HELP_STRING([--enable-multi-arch], + [enable single DSO with optimizations for multiple architectures]), + [multi_arch=$enableval], + [multi_arch=default]) + +AC_ARG_ENABLE([nss-crypt], + AC_HELP_STRING([--enable-nss-crypt], + [enable libcrypt to use nss]), + [nss_crypt=$enableval], + [nss_crypt=no]) +if test x$nss_crypt = xyes; then + nss_includes=-I$(nss-config --includedir 2>/dev/null) + if test $? -ne 0; then + AC_MSG_ERROR([cannot find include directory with nss-config]) + fi + old_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $nss_includes" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool; +#include <hasht.h> +#include <nsslowhash.h> +void f (void) { NSSLOW_Init (); }])], + libc_cv_nss_crypt=yes, + AC_MSG_ERROR([ +cannot find NSS headers with lowlevel hash function interfaces])) + old_LIBS="$LIBS" + old_LDFLAGS="$LDFLAGS" + LIBS="$LIBS -lfreebl3" + AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool; +#include <hasht.h> +#include <nsslowhash.h>], + [NSSLOW_Init();])], + libc_cv_nss_crypt=yes, + AC_MSG_ERROR([ +cannot link program using lowlevel NSS hash functions])) + # Check to see if there is a static NSS cryptographic library. + # If there isn't then we can't link anything with libcrypt.a, + # and that might mean disabling some static tests. + LDFLAGS="$LDFLAGS -static" + AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool; +#include <hasht.h> +#include <nsslowhash.h>], + [NSSLOW_Init();])], + libc_cv_static_nss_crypt=yes, + libc_cv_static_nss_crypt=no) + LDFLAGS="$old_LDFLAGS" + CFLAGS="$old_CFLAGS" + LIBS="$old_LIBS" +else + libc_cv_nss_crypt=no + libc_cv_static_nss_crypt=no +fi +AC_SUBST(libc_cv_nss_crypt) +AC_SUBST(libc_cv_static_nss_crypt) + + +AC_ARG_ENABLE([obsolete-rpc], + AC_HELP_STRING([--enable-obsolete-rpc], + [build and install the obsolete RPC code for link-time usage]), + [link_obsolete_rpc=$enableval], + [link_obsolete_rpc=no]) +AC_SUBST(link_obsolete_rpc) + +if test "$link_obsolete_rpc" = yes; then + AC_DEFINE(LINK_OBSOLETE_RPC) +fi + +AC_ARG_ENABLE([obsolete-nsl], + AC_HELP_STRING([--enable-obsolete-nsl], + [build and install the obsolete libnsl library and depending NSS modules]), + [build_obsolete_nsl=$enableval], + [build_obsolete_nsl=no]) +AC_SUBST(build_obsolete_nsl) + +if test "$build_obsolete_nsl" = yes; then + AC_DEFINE(LINK_OBSOLETE_NSL) +fi + +AC_ARG_ENABLE([systemtap], + [AS_HELP_STRING([--enable-systemtap], + [enable systemtap static probe points @<:@default=no@:>@])], + [systemtap=$enableval], + [systemtap=no]) +if test "x$systemtap" != xno; then + AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl + old_CFLAGS="$CFLAGS" + CFLAGS="-std=gnu11 $CFLAGS" + AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h> +void foo (int i, void *p) +{ + asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) "" + :: STAP_PROBE_ASM_OPERANDS (2, i, p)); +}]])], [libc_cv_sdt=yes], [libc_cv_sdt=no]) + CFLAGS="$old_CFLAGS"]) + if test $libc_cv_sdt = yes; then + AC_DEFINE([USE_STAP_PROBE]) + elif test "x$systemtap" != xauto; then + AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support]) + fi +fi + +AC_ARG_ENABLE([build-nscd], + [AS_HELP_STRING([--disable-build-nscd], + [disable building and installing the nscd daemon])], + [build_nscd=$enableval], + [build_nscd=default]) +AC_SUBST(build_nscd) + +# Note the use of $use_nscd is near the bottom of the file. +AC_ARG_ENABLE([nscd], + [AS_HELP_STRING([--disable-nscd], + [library functions will not contact the nscd daemon])], + [use_nscd=$enableval], + [use_nscd=yes]) + +AC_ARG_ENABLE([pt_chown], + [AS_HELP_STRING([--enable-pt_chown], + [Enable building and installing pt_chown])], + [build_pt_chown=$enableval], + [build_pt_chown=no]) +AC_SUBST(build_pt_chown) +if test "$build_pt_chown" = yes; then + AC_DEFINE(HAVE_PT_CHOWN) +fi + +AC_ARG_ENABLE([tunables], + [AS_HELP_STRING([--enable-tunables], + [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])], + [have_tunables=$enableval], + [have_tunables=no]) +AC_SUBST(have_tunables) +if test "$have_tunables" = yes; then + AC_DEFINE(HAVE_TUNABLES) +fi + +# The abi-tags file uses a fairly simplistic model for name recognition that +# can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a +# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell. +# This doesn't get used much beyond that, so it's fairly safe. +case "$host_os" in +linux*) + ;; +gnu*) + host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'` + ;; +esac + +AC_ARG_ENABLE([mathvec], + [AS_HELP_STRING([--enable-mathvec], + [Enable building and installing mathvec @<:@default depends on architecture@:>@])], + [build_mathvec=$enableval], + [build_mathvec=notset]) + +# We keep the original values in `$config_*' and never modify them, so we +# can write them unchanged into config.make. Everything else uses +# $machine, $vendor, and $os, and changes them whenever convenient. +config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os + +# Don't allow vendor == "unknown" +test "$config_vendor" = unknown && config_vendor= +config_os="`echo $config_os | sed 's/^unknown-//'`" + +# Some configurations imply other options. +elf=yes + +# The configure fragment of an add-on port can modify these to supplement +# or override the table in the case statement below. No fragment should +# ever change the config_* variables, however. +machine=$config_machine +vendor=$config_vendor +os=$config_os +base_os='' + +submachine= +AC_ARG_WITH([cpu], + AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]), + [dnl + case "$withval" in + yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;; + no) ;; + *) submachine="$withval" ;; + esac +]) + +# An preconfigure script can set this when it wants to disable the sanity +# check below. +libc_config_ok=no + +dnl Let sysdeps/*/preconfigure act here, like they can in add-ons. +LIBC_PRECONFIGURE([$srcdir], [for sysdeps]) + +dnl Having this here, though empty, makes sure that if add-ons' fragments +dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then +dnl our AC_OUTPUT will actually use it. +AC_CONFIG_SUBDIRS() + +case "$enable_add_ons" in +''|no) add_ons= ;; +yes|'*') + add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps | + sed 's@/[[^/]]*$@@' | sort | uniq` + add_ons_automatic=yes + ;; +*) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'` + add_ons_automatic=no ;; +esac + +configured_add_ons= +add_ons_sfx= +add_ons_pfx= +if test x"$add_ons" != x; then + for f in $add_ons; do + # Some sanity checks + case "$f" in + crypt) + AC_MSG_ERROR([ +*** It seems that you're using an old \`crypt' add-on. crypt is now +*** part of glibc and using the old add-on will not work with this +*** release. Start again with fresh sources and without the old +*** \`crypt' add-on.]) + ;; + localedata) + AC_MSG_ERROR([ +*** It seems that you're using an old \`localedata' add-on. localedata +*** is now part of glibc and using the old add-on will not work with +*** this release. Start again with fresh sources and without the old +*** \`localedata' add-on.]) + ;; + esac + done + + # Now source each add-on's configure fragment. + # The fragments can use $srcdir/$libc_add_on to find themselves, + # and test $add_ons_automatic to see if they were explicitly requested. + # A fragment can clear (or even change) $libc_add_on to affect + # whether it goes into the list to be actually used in the build. + use_add_ons= + for libc_add_on in $add_ons; do + # Test whether such a directory really exists. + # It can be absolute, or relative to $srcdir, or relative to the build dir. + case "$libc_add_on" in + /*) + libc_add_on_srcdir=$libc_add_on + ;; + *) + test -d "$srcdir/$libc_add_on" || { + if test -d "$libc_add_on"; then + libc_add_on="`pwd`/$libc_add_on" + else + AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist) + fi + } + libc_add_on_srcdir=$srcdir/$libc_add_on + ;; + esac + + libc_add_on_frag=$libc_add_on_srcdir/configure + libc_add_on_canonical= + libc_add_on_config_subdirs= + if test -r "$libc_add_on_frag"; then + AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on) + libc_add_on_canonical=unknown + libc_add_on_subdirs= + . "$libc_add_on_frag" + test -z "$libc_add_on" || { + configured_add_ons="$configured_add_ons $libc_add_on" + if test "x$libc_add_on_canonical" = xunknown; then + AC_MSG_ERROR(fragment must set \$libc_add_on_canonical) + fi + for d in $libc_add_on_subdirs; do + case "$libc_add_on" in + /*) subdir_srcdir="$libc_add_on" ;; + *) subdir_srcdir="\$(..)$libc_add_on" ;; + esac + case "$d" in + .) + d="${libc_add_on_canonical:-$libc_add_on}" + ;; + /*) + subdir_srcdir="$d" + ;; + *) + subdir_srcdir="$subdir_srcdir/$d" + ;; + esac + d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'` + add_on_subdirs="$add_on_subdirs $d" + test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars +$d-srcdir = $subdir_srcdir" + done + for d in $libc_add_on_config_subdirs; do + case "$d" in + /*) AC_MSG_ERROR(dnl +fragment uses absolute path in \$libc_add_on_config_subdirs) ;; + esac + if test ! -d "$libc_add_on_srcdir/$d"; then + AC_MSG_ERROR(fragment wants to configure missing directory $d) + fi + case "$libc_add_on" in + /*) AC_MSG_ERROR(dnl +relative path required for add-on using \$libc_add_on_config_subdirs) ;; + esac + subdirs="$subdirs $libc_add_on/$d" + done + } + fi + if test -n "$libc_add_on"; then + LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for]) + use_add_ons="$use_add_ons $libc_add_on" + add_ons_pfx="$add_ons_pfx $libc_add_on/" + test -z "$libc_add_on_canonical" || + add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical" + fi + done + # Use echo to strip excess whitespace. + add_ons="`echo $use_add_ons`" +fi +AC_SUBST(add_ons) +AC_SUBST(add_on_subdirs) + + +### +### By using the undocumented --enable-hacker-mode option for configure +### one can skip this test to make the configuration not fail for unsupported +### platforms. +### +if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then + case "$machine-$host_os" in + *-linux* | *-gnu*) + ;; + *) + AC_MSG_ERROR([ +*** The GNU C library is currently unavailable for this platform. +*** If you are interested in seeing glibc on this platform visit +*** the "How to submit a new port" in the wiki: +*** https://sourceware.org/glibc/wiki/#Development +*** and join the community!]) + ;; + esac +fi + +# Set base_machine if not set by a preconfigure fragment. +test -n "$base_machine" || base_machine=$machine +AC_SUBST(base_machine) + +AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl +LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector], + [libc_cv_ssp=yes], + [libc_cv_ssp=no]) +]) + +AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl +LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong], + [libc_cv_ssp_strong=yes], + [libc_cv_ssp_strong=no]) +]) + +AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl +LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all], + [libc_cv_ssp_all=yes], + [libc_cv_ssp_all=no]) +]) + +stack_protector= +no_stack_protector= +if test "$libc_cv_ssp" = yes; then + no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0" + AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR) +fi + +if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then + stack_protector="-fstack-protector" + AC_DEFINE(STACK_PROTECTOR_LEVEL, 1) +elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then + stack_protector="-fstack-protector-all" + AC_DEFINE(STACK_PROTECTOR_LEVEL, 2) +elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then + stack_protector="-fstack-protector-strong" + AC_DEFINE(STACK_PROTECTOR_LEVEL, 3) +else + stack_protector="-fno-stack-protector" + AC_DEFINE(STACK_PROTECTOR_LEVEL, 0) +fi +AC_SUBST(libc_cv_ssp) +AC_SUBST(stack_protector) +AC_SUBST(no_stack_protector) + +if test -n "$stack_protector"; then + dnl Don't run configure tests with stack-protection on, to avoid problems with + dnl bootstrapping. + no_ssp=-fno-stack-protector +else + no_ssp= + + if test "$enable_stack_protector" != no; then + AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.]) + fi +fi + +# For the multi-arch option we need support in the assembler & linker. +AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support], + libc_cv_ld_gnu_indirect_function, [dnl +cat > conftest.S <<EOF +.type foo,%gnu_indirect_function +foo: +.globl _start +_start: +.globl __start +__start: +.data +#ifdef _LP64 +.quad foo +#else +.long foo +#endif +EOF +libc_cv_ld_gnu_indirect_function=no +if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ + -nostartfiles -nostdlib $no_ssp \ + -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then + # Do a link to see if the backend supports IFUNC relocs. + $READELF -r conftest 1>&AS_MESSAGE_LOG_FD + LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || { + libc_cv_ld_gnu_indirect_function=yes + } +fi +rm -f conftest*]) + +# Check if gcc supports attribute ifunc as it is used in libc_ifunc macro. +AC_CACHE_CHECK([for gcc attribute ifunc support], + libc_cv_gcc_indirect_function, [dnl +cat > conftest.c <<EOF +extern int func (int); +int used_func (int a) +{ + return a; +} +static void *resolver () +{ + return &used_func; +} +extern __typeof (func) func __attribute__ ((ifunc ("resolver"))); +EOF +libc_cv_gcc_indirect_function=no +if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \ + 2>&AS_MESSAGE_LOG_FD ; then + if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then + libc_cv_gcc_indirect_function=yes + fi +fi +rm -f conftest*]) + +if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then + if test x"$multi_arch" = xyes; then + AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support]) + else + multi_arch=no + fi +fi +if test x"$libc_cv_gcc_indirect_function" != xyes && + test x"$multi_arch" = xyes; then + AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support. +Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function]) +fi +multi_arch_d= +if test x"$multi_arch" != xno; then + multi_arch_d=/multiarch +fi + +# Compute the list of sysdep directories for this configuration. +# This can take a while to compute. +sysdep_dir=$srcdir/sysdeps +AC_MSG_CHECKING(sysdep dirs) +dnl We need to use [ and ] for other purposes for a while now. +changequote(,)dnl +# Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1. +os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`" + +test "x$base_os" != x || case "$os" in +gnu*) + base_os=mach/hurd ;; +linux*) + base_os=unix/sysv ;; +esac + +# For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos. +tail=$os +ostry=$os +while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do + ostry="$ostry /$o" + tail=$o +done +o=`echo $tail | sed 's/[0-9]*$//'` +if test $o != $tail; then + ostry="$ostry /$o" +fi +# For linux-gnu, try linux-gnu, then linux. +o=`echo $tail | sed 's/-.*$//'` +if test $o != $tail; then + ostry="$ostry /$o" +fi + +# For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix. +base= +tail=$base_os +while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do + set $b + base="$base /$1" + tail="$2" +done + +# For sparc/sparc32, try sparc/sparc32 and then sparc. +mach= +tail=$machine${submachine:+/$submachine} +while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do + set $m + # Prepend the machine's FPU directory unless --without-fp. + if test "$with_fp" = yes; then + maybe_fpu=/fpu + else + maybe_fpu=/nofpu + fi + # For each machine term, try it with and then without /multiarch. + for try_fpu in $maybe_fpu ''; do + for try_multi in $multi_arch_d ''; do + mach="$mach /$1$try_fpu$try_multi" + done + done + tail="$2" +done + +dnl We are done with glob and regexp uses of [ and ]; return to autoconf. +changequote([,])dnl + +# Find what sysdep directories exist. +sysnames_add_ons= +sysnames= +for b in $base ''; do + for m0 in $mach ''; do + for v in /$vendor ''; do + test "$v" = / && continue + for o in /$ostry ''; do + test "$o" = / && continue + for m in $mach ''; do + for d in $add_ons_pfx ''; do + for a in $add_ons_sfx ''; do + try_suffix="$m0$b$v$o$m" + if test -n "$try_suffix"; then + try_srcdir="${srcdir}/" + case "$d" in + /*) try_srcdir= ;; + esac + try="${d}sysdeps$try_suffix$a" + test -n "$enable_debug_configure" && + echo "$0 [DEBUG]: try $try" >&2 + if test -d "$try_srcdir$try"; then + sysnames="$sysnames $try" + { test -n "$o" || test -n "$b"; } && os_used=t + { test -n "$m" || test -n "$m0"; } && machine_used=t + case x${m0:-$m} in + x*/$submachine) submachine_used=t ;; + esac + if test -n "$d"; then + case "$sysnames_add_ons" in + *" $d "*) ;; + *|'') sysnames_add_ons="$sysnames_add_ons $d" ;; + esac + fi + fi + fi + done + done + done + done + done + done +done + +# If the assembler supports gnu_indirect_function symbol type and the +# architecture supports multi-arch, we enable multi-arch by default. +case $sysnames_add_ons$sysnames in +*"$multi_arch_d"*) + ;; +*) + test x"$multi_arch" = xdefault && multi_arch=no + ;; +esac +if test x"$multi_arch" != xno; then + AC_DEFINE(USE_MULTIARCH) +fi +AC_SUBST(multi_arch) + +if test -z "$os_used" && test "$os" != none; then + AC_MSG_ERROR(Operating system $os is not supported.) +fi +if test -z "$machine_used" && test "$machine" != none; then + AC_MSG_ERROR(The $machine is not supported.) +fi +if test -z "$submachine_used" && test -n "$submachine"; then + AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.) +fi +AC_SUBST(submachine) + +# We have now validated the configuration. + +# Expand the list of system names into a full list of directories +# from each element's parent name and Implies file (if present). +set $sysnames +names= +while test $# -gt 0; do + name=$1 + shift + + case " $names " in *" $name "*) + # Already in the list. + continue + esac + + # Report each name as we discover it, so there is no long pause in output. + echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD + + name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'` + + case $name in + /*) xsrcdir= ;; + *) xsrcdir=$srcdir/ ;; + esac + test -n "$enable_debug_configure" && + echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2 + + for implies_file in Implies Implies-before Implies-after; do + implies_type=`echo $implies_file | sed s/-/_/` + eval ${implies_type}= + if test -f $xsrcdir$name/$implies_file; then + # Collect more names from the `Implies' file (removing comments). + implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`" + for x in $implied_candidate; do + found=no + if test -d $xsrcdir$name_base/$x; then + eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\"" + found=yes + fi + for d in $add_ons_pfx ''; do + try="${d}sysdeps/$x" + case $d in + /*) try_srcdir= ;; + *) try_srcdir=$srcdir/ ;; + esac + test -n "$enable_debug_configure" && + echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2 + if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try; + then + eval "${implies_type}=\"\$${implies_type} \$try\"" + found=yes + case "$sysnames_add_ons" in + *" $d "*) ;; + *|'') sysnames_add_ons="$sysnames_add_ons $d" ;; + esac + fi + done + if test $found = no; then + AC_MSG_WARN($name/$implies_file specifies nonexistent $x) + fi + done + fi + done + + # Add NAME to the list of names. + names="$names $name" + + # Find the parent of NAME, using the empty string if it has none. +changequote(,)dnl + parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`" +changequote([,])dnl + + test -n "$enable_debug_configure" && + echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \ +Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2 + + # Add the names implied by NAME, and NAME's parent (if it has one), to + # the list of names to be processed (the argument list). We prepend the + # implied names to the list and append the parent. We want implied + # directories to come before further directories inferred from the + # configuration components; this ensures that for sysv4, unix/common + # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*) + # after sysv4). + sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`" + test -n "$sysnames" && set $sysnames +done + +# Add the default directories. +default_sysnames="sysdeps/generic" +sysnames="$names $default_sysnames" +AC_SUBST(sysnames) +# The other names were emitted during the scan. +AC_MSG_RESULT($default_sysnames) + +# Collect the list of add-ons that supply partial sysdeps trees. +sysdeps_add_ons= +for add_on in $add_ons; do + case "$add_on" in + /*) xsrcdir= ;; + *) xsrcdir="$srcdir/" ;; + esac + + test -d "$xsrcdir$add_on/sysdeps" || { + case "$configured_add_ons " in + *" $add_on "*) ;; + *|'') + AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree) + ;; + esac + continue + } + + sysdeps_add_ons="$sysdeps_add_ons $add_on" + case "$sysnames_add_ons" in + *" $add_on/ "*) ;; + *|'') + AC_MSG_WARN(add-on $add_on contributed no sysdeps directories) + continue ;; + esac + + found=no + for d in $sysnames; do + case "$d" in + $add_on/sysdeps/*) ;; + *) continue ;; + esac + (cd "$xsrcdir$d" && for f in *[[!~]]; do + case "$f" in + sys|bits) + for ff in $f/*.h; do + test -d "$ff" || { test -e "$ff" && exit 88; } + done + ;; + *) + test -d "$f" || { test -e "$f" && exit 88; } + ;; + esac + done) + if test $? -eq 88; then + found=yes + break + fi + done + if test $found = no; then + AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories) + fi +done +AC_SUBST(sysdeps_add_ons) + + +### Locate tools. + +AC_PROG_INSTALL +if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then + # The makefiles need to use a different form to find it in $srcdir. + INSTALL='\$(..)./scripts/install-sh -c' +fi +AC_PROG_LN_S + +LIBC_PROG_BINUTILS + +# Accept binutils 2.22 or newer. +AC_CHECK_PROG_VER(AS, $AS, --version, + [GNU assembler.* \([0-9]*\.[0-9.]*\)], + [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], + AS=: critic_missing="$critic_missing as") +AC_CHECK_PROG_VER(LD, $LD, --version, + [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)], + [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], + LD=: critic_missing="$critic_missing ld") + +# These programs are version sensitive. +AC_CHECK_TOOL_PREFIX +AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version, + [GNU Make[^0-9]*\([0-9][0-9.]*\)], + [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make") + +AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version, + [GNU gettext.* \([0-9]*\.[0-9.]*\)], + [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*], + MSGFMT=: aux_missing="$aux_missing msgfmt") +AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version, + [GNU texinfo.* \([0-9][0-9.]*\)], + [4.[7-9]*|4.[1-9][0-9]*|[5-9].*], + MAKEINFO=: aux_missing="$aux_missing makeinfo") +AC_CHECK_PROG_VER(SED, sed, --version, + [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)], + [3.0[2-9]*|3.[1-9]*|[4-9]*], + SED=: aux_missing="$aux_missing sed") +AC_CHECK_PROG_VER(AWK, gawk, --version, + [GNU Awk[^0-9]*\([0-9][0-9.]*\)], + [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk") + +AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [ +AC_TRY_COMPILE([], [ +#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) +#error insufficient compiler +#endif], + [libc_cv_compiler_ok=yes], + [libc_cv_compiler_ok=no])]) +AS_IF([test $libc_cv_compiler_ok != yes], + [critic_missing="$critic_missing compiler"]) + +AC_CHECK_TOOL(NM, nm, false) + +if test "x$maintainer" = "xyes"; then + AC_CHECK_PROGS(AUTOCONF, autoconf, no) + case "x$AUTOCONF" in + xno|x|x:) AUTOCONF=no ;; + *) + AC_CACHE_CHECK(dnl + whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl + if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then + libc_cv_autoconf_works=yes + else + libc_cv_autoconf_works=no + fi]) + test $libc_cv_autoconf_works = yes || AUTOCONF=no + ;; + esac + if test "x$AUTOCONF" = xno; then + aux_missing="$aux_missing autoconf" + fi +else + AUTOCONF=no +fi + +# Check for python3 if available, or else python. +AC_CHECK_PROGS(PYTHON_PROG, python3 python,no) +case "x$PYTHON_PROG" in +xno|x|x:) PYTHON_PROG=no ;; +*) ;; +esac + +if test "x$PYTHON_PROG" = xno; then + aux_missing="$aux_missing python" +else + PYTHON="$PYTHON_PROG -B" + AC_SUBST(PYTHON) +fi + +test -n "$critic_missing" && AC_MSG_ERROR([ +*** These critical programs are missing or too old:$critic_missing +*** Check the INSTALL file for required versions.]) + +test -n "$aux_missing" && AC_MSG_WARN([ +*** These auxiliary programs are missing or incompatible versions:$aux_missing +*** some features or tests will be disabled. +*** Check the INSTALL file for required versions.]) + +# if using special system headers, find out the compiler's sekrit +# header directory and add that to the list. NOTE: Only does the right +# thing on a system that doesn't need fixincludes. (Not presently a problem.) +if test -n "$sysheaders"; then + SYSINCLUDES=-nostdinc + for d in include include-fixed; do + i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" && + SYSINCLUDES="$SYSINCLUDES -isystem $i" + done + SYSINCLUDES="$SYSINCLUDES \ +-isystem `echo $sysheaders | sed 's/:/ -isystem /g'`" + if test -n "$CXX"; then + CXX_SYSINCLUDES= + for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \ + | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do + test "x$cxxheaders" != x && + CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders" + done + fi +fi +AC_SUBST(SYSINCLUDES) +AC_SUBST(CXX_SYSINCLUDES) + +# Obtain some C++ header file paths. This is used to make a local +# copy of those headers in Makerules. +if test -n "$CXX"; then + find_cxx_header () { + echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}" + } + CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)" + CXX_CMATH_HEADER="$(find_cxx_header cmath)" +fi +AC_SUBST(CXX_CSTDLIB_HEADER) +AC_SUBST(CXX_CMATH_HEADER) + +# Test if LD_LIBRARY_PATH contains the notation for the current directory +# since this would lead to problems installing/building glibc. +# LD_LIBRARY_PATH contains the current directory if one of the following +# is true: +# - one of the terminals (":" and ";") is the first or last sign +# - two terminals occur directly after each other +# - the path contains an element with a dot in it +AC_MSG_CHECKING(LD_LIBRARY_PATH variable) +changequote(,)dnl +case ${LD_LIBRARY_PATH} in + [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* ) + ld_library_path_setting="contains current directory" + ;; + *) + ld_library_path_setting="ok" + ;; +esac +changequote([,])dnl +AC_MSG_RESULT($ld_library_path_setting) +if test "$ld_library_path_setting" != "ok"; then +AC_MSG_ERROR([ +*** LD_LIBRARY_PATH shouldn't contain the current directory when +*** building glibc. Please change the environment variable +*** and run configure again.]) +fi + +AC_PATH_PROG(BASH_SHELL, bash, no) + +AC_PATH_PROG(PERL, perl, no) +if test "$PERL" != no && + (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then + PERL=no +fi +AC_PATH_PROG(INSTALL_INFO, install-info, no, + $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin) +AC_CHECK_PROG_VER(BISON, bison, --version, + [bison (GNU Bison) \([0-9]*\.[0-9.]*\)], + [2.7*|[3-9].*|[1-9][0-9]*], + BISON=no) + +AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl +cat > conftest.s <<EOF +.text +foo: +.set glibc_conftest_frobozz,foo +.globl glibc_conftest_frobozz +EOF +# The alpha-dec-osf1 assembler gives only a warning for `.set' +# (but it doesn't work), so we must do a linking check to be sure. +cat > conftest1.c <<\EOF +extern int glibc_conftest_frobozz; +void _start() { glibc_conftest_frobozz = 1; } +EOF +if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ + -nostartfiles -nostdlib $no_ssp \ + -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then + libc_cv_asm_set_directive=yes +else + libc_cv_asm_set_directive=no +fi +rm -f conftest*]) +if test $libc_cv_asm_set_directive = yes; then + AC_DEFINE(HAVE_ASM_SET_DIRECTIVE) +fi + +AC_CACHE_CHECK(linker support for protected data symbol, + libc_cv_protected_data, + [cat > conftest.c <<EOF + int bar __attribute__ ((visibility ("protected"))) = 1; +EOF + libc_cv_protected_data=no + if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then + cat > conftest.c <<EOF + extern int bar; + int main (void) { return bar; } +EOF + if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then + libc_cv_protected_data=yes + fi + fi + rm -f conftest.* + ]) +AC_SUBST(libc_cv_protected_data) + +AC_CACHE_CHECK(for broken __attribute__((alias())), + libc_cv_broken_alias_attribute, + [cat > conftest.c <<EOF + extern int foo (int x) __asm ("xyzzy"); + int bar (int x) { return x; } + extern __typeof (bar) foo __attribute ((weak, alias ("bar"))); + extern int dfoo; + extern __typeof (dfoo) dfoo __asm ("abccb"); + int dfoo = 1; +EOF + libc_cv_broken_alias_attribute=yes + if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then + if grep 'xyzzy' conftest.s >/dev/null && + grep 'abccb' conftest.s >/dev/null; then + libc_cv_broken_alias_attribute=no + fi + fi + rm -f conftest.c conftest.s + ]) +if test $libc_cv_broken_alias_attribute = yes; then + AC_MSG_ERROR(working alias attribute support required) +fi + +AC_CACHE_CHECK(whether to put _rtld_local into .sdata section, + libc_cv_have_sdata_section, + [echo "int i;" > conftest.c + libc_cv_have_sdata_section=no + if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \ + | grep '\.sdata' >/dev/null; then + libc_cv_have_sdata_section=yes + fi + rm -f conftest.c conftest.so + ]) +if test $libc_cv_have_sdata_section = yes; then + AC_DEFINE(HAVE_SDATA_SECTION) +fi + +AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer, + libc_cv_ctors_header, [dnl + libc_cv_ctors_header=yes + LIBC_TRY_LINK_STATIC([ +__attribute__ ((constructor)) void ctor (void) { asm (""); } +__attribute__ ((destructor)) void dtor (void) { asm (""); } +], + [dnl + AS_IF([$READELF -WS conftest$ac_exeext | $AWK ' + { gsub(/\@<:@ */, "@<:@") } + $2 == ".ctors" || $2 == ".dtors" { + size = strtonum("0x" $6) + align = strtonum("0x" $NF) + seen@<:@$2@:>@ = 1 + stub@<:@$2@:>@ = size == align * 2 + } + END { + ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@ + dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@ + exit ((ctors_ok && dtors_ok) ? 0 : 1) + } + '], [libc_cv_ctors_header=no]) + ], [dnl + AC_MSG_ERROR([missing __attribute__ ((constructor)) support??]) + ]) +]) +if test $libc_cv_ctors_header = no; then + AC_DEFINE(NO_CTORS_DTORS_SECTIONS) +fi + +AC_CACHE_CHECK(for libunwind-support in compiler, + libc_cv_cc_with_libunwind, [ + cat > conftest.c <<EOF +int main (void) { return 0; } +EOF + if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \ + conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then + libc_cv_cc_with_libunwind=yes + else + libc_cv_cc_with_libunwind=no + fi + rm -f conftest*]) +AC_SUBST(libc_cv_cc_with_libunwind) +if test $libc_cv_cc_with_libunwind = yes; then + AC_DEFINE(HAVE_CC_WITH_LIBUNWIND) +fi + +ASFLAGS_config= +AC_CACHE_CHECK(whether --noexecstack is desirable for .S files, + libc_cv_as_noexecstack, [dnl +cat > conftest.c <<EOF +void foo (void) { } +EOF +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS + -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \ + && grep .note.GNU-stack conftest.s >/dev/null \ + && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack + -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD]) +then + libc_cv_as_noexecstack=yes +else + libc_cv_as_noexecstack=no +fi +rm -f conftest*]) +if test $libc_cv_as_noexecstack = yes; then + ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack" +fi +AC_SUBST(ASFLAGS_config) + +AC_CACHE_CHECK(for -z combreloc, + libc_cv_z_combreloc, [dnl +cat > conftest.c <<EOF +extern int bar (int); +extern int mumble; +int foo (void) { return bar (mumble); } +EOF +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS + -fPIC -shared $no_ssp -o conftest.so conftest.c + -nostdlib -nostartfiles + -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD]) +then +dnl The following test is a bit weak. We must use a tool which can test +dnl cross-platform since the gcc used can be a cross compiler. Without +dnl introducing new options this is not easily doable. Instead use a tool +dnl which always is cross-platform: readelf. To detect whether -z combreloc +dnl look for a section named .rel.dyn or .rela.dyn. + if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then + libc_cv_z_combreloc=yes + else + libc_cv_z_combreloc=no + fi +else + libc_cv_z_combreloc=no +fi +rm -f conftest*]) +if test "$libc_cv_z_combreloc" = yes; then + AC_DEFINE(HAVE_Z_COMBRELOC) +fi +AC_SUBST(libc_cv_z_combreloc) + +LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack], + [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no]) +AC_SUBST(libc_cv_z_execstack) + +AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl +LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no]) +]) + +AC_SUBST(libc_cv_fpie) + +AC_CACHE_CHECK(for --hash-style option, + libc_cv_hashstyle, [dnl +cat > conftest.c <<EOF +int _start (void) { return 42; } +EOF +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp + -fPIC -shared -o conftest.so conftest.c + -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD]) +then + libc_cv_hashstyle=yes +else + libc_cv_hashstyle=no +fi +rm -f conftest*]) +AC_SUBST(libc_cv_hashstyle) + +# The linker's default -shared behavior is good enough if it +# does these things that our custom linker scripts ensure that +# all allocated NOTE sections come first. +if test "$use_default_link" = default; then + AC_CACHE_CHECK([for sufficient default -shared layout], + libc_cv_use_default_link, [dnl + libc_cv_use_default_link=no + cat > conftest.s <<\EOF + .section .note.a,"a",%note + .balign 4 + .long 4,4,9 + .string "GNU" + .string "foo" + .section .note.b,"a",%note + .balign 4 + .long 4,4,9 + .string "GNU" + .string "bar" +EOF + if AC_TRY_COMMAND([dnl + ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) && + ac_try=`$READELF -S conftest.so | sed -n \ + ['${x;p;} + s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/ + t a + b + : a + H']` + then + libc_seen_a=no libc_seen_b=no + set -- $ac_try + while test $# -ge 2 -a "$1" = NOTE; do + case "$2" in + .note.a) libc_seen_a=yes ;; + .note.b) libc_seen_b=yes ;; + esac + shift 2 + done + case "$libc_seen_a$libc_seen_b" in + yesyes) + libc_cv_use_default_link=yes + ;; + *) + echo >&AS_MESSAGE_LOG_FD "\ +$libc_seen_a$libc_seen_b from: +$ac_try" + ;; + esac + fi + rm -f conftest*]) + use_default_link=$libc_cv_use_default_link +fi + +AC_CACHE_CHECK(for GLOB_DAT reloc, + libc_cv_has_glob_dat, [dnl +cat > conftest.c <<EOF +extern int mumble; +int foo (void) { return mumble; } +EOF +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS + -fPIC -shared -o conftest.so conftest.c + -nostdlib -nostartfiles $no_ssp + 1>&AS_MESSAGE_LOG_FD]) +then +dnl look for GLOB_DAT relocation. + if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then + libc_cv_has_glob_dat=yes + else + libc_cv_has_glob_dat=no + fi +else + libc_cv_has_glob_dat=no +fi +rm -f conftest*]) +AC_SUBST(libc_cv_has_glob_dat) + +AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl +if libc_cv_output_format=` +${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD` +then + : +else + libc_cv_output_format= +fi +test -n "$libc_cv_output_format" || libc_cv_output_format=unknown]) +AC_SUBST(libc_cv_output_format) + +AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl +cat > conftest.c <<EOF +int foo; +EOF +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors + conftest.c 1>&AS_MESSAGE_LOG_FD]) +then + libc_cv_fno_toplevel_reorder=yes +else + libc_cv_fno_toplevel_reorder=no +fi +rm -f conftest*]) +if test $libc_cv_fno_toplevel_reorder = yes; then + fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors" +else + fno_unit_at_a_time=-fno-unit-at-a-time +fi +AC_SUBST(fno_unit_at_a_time) + +AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2, +[dnl +cat > conftest.c <<EOF +__thread int i; +void foo (void) +{ + i = 10; +} +EOF +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2 + conftest.c 1>&AS_MESSAGE_LOG_FD]) +then + libc_cv_mtls_dialect_gnu2=yes +else + libc_cv_mtls_dialect_gnu2=no +fi +rm -f conftest*]) +AC_SUBST(libc_cv_mtls_dialect_gnu2) +LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2]) + +AC_CACHE_CHECK(whether cc puts quotes around section names, + libc_cv_have_section_quotes, + [cat > conftest.c <<EOF + static const int foo + __attribute__ ((section ("bar"))) = 1; +EOF + if ${CC-cc} -S conftest.c -o conftest.s; then + if grep '\.section.*"bar"' conftest.s >/dev/null; then + libc_cv_have_section_quotes=yes + else + libc_cv_have_section_quotes=no + fi + else + libc_cv_have_section_quotes=unknown + fi + rm -f conftest.{c,s} + ]) +if test $libc_cv_have_section_quotes = yes; then + AC_DEFINE(HAVE_SECTION_QUOTES) +fi + +AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl +cat > conftest.c <<\EOF +void zero (void *x) +{ + __builtin_memset (x, 0, 1000); +} +EOF +dnl +if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]); +then + libc_cv_gcc_builtin_memset=no +else + libc_cv_gcc_builtin_memset=yes +fi +rm -f conftest* ]) +if test "$libc_cv_gcc_builtin_memset" = yes ; then + AC_DEFINE(HAVE_BUILTIN_MEMSET) +fi + +AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl +cat > conftest.c <<\EOF +extern char *strstr (const char *, const char *) __asm ("my_strstr"); +char *foo (const char *a, const char *b) +{ + return __builtin_strstr (a, b); +} +EOF +dnl +if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]); +then + libc_cv_gcc_builtin_redirection=yes +else + libc_cv_gcc_builtin_redirection=no +fi +rm -f conftest* ]) +if test "$libc_cv_gcc_builtin_redirection" = no; then + AC_MSG_ERROR([support for the symbol redirection needed]) +fi + +dnl Determine how to disable generation of FMA instructions. +AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions], + libc_cv_cc_nofma, [dnl +libc_cv_cc_nofma= +for opt in -ffp-contract=off -mno-fused-madd; do + LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break]) +done]) +AC_SUBST(libc_cv_cc_nofma) + +if test -n "$submachine"; then + AC_CACHE_CHECK([for compiler option for CPU variant], + libc_cv_cc_submachine, [dnl + libc_cv_cc_submachine=no + for opt in "-march=$submachine" "-mcpu=$submachine"; do + LIBC_TRY_CC_OPTION([$opt], [ + libc_cv_cc_submachine="$opt" + break], []) + done]) + if test "x$libc_cv_cc_submachine" = xno; then + AC_MSG_ERROR([${CC-cc} does not support $submachine]) + fi +fi +AC_SUBST(libc_cv_cc_submachine) + +AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \ +__attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl +cat > conftest.c <<EOF +void +__attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns"))) +foo (void) {} +EOF +libc_cv_cc_loop_to_function=no +if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c]) +then + libc_cv_cc_loop_to_function=yes +fi +rm -f conftest*]) +if test $libc_cv_cc_loop_to_function = yes; then + AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL) +fi +AC_SUBST(libc_cv_cc_loop_to_function) + +dnl Check whether we have the gd library available. +AC_MSG_CHECKING(for libgd) +if test "$with_gd" != "no"; then + old_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $libgd_include" + old_LDFLAGS="$LDFLAGS" + LDFLAGS="$LDFLAGS $libgd_ldflags" + old_LIBS="$LIBS" + LIBS="$LIBS -lgd -lpng -lz -lm" + AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no) + CFLAGS="$old_CFLAGS" + LDFLAGS="$old_LDFLAGS" + LIBS="$old_LIBS" +else + LIBGD=no +fi +AC_MSG_RESULT($LIBGD) +AC_SUBST(LIBGD) + +# SELinux detection +if test x$with_selinux = xno ; then + have_selinux=no; +else + # See if we have the SELinux library + AC_CHECK_LIB(selinux, is_selinux_enabled, + have_selinux=yes, have_selinux=no) + if test x$with_selinux = xyes ; then + if test x$have_selinux = xno ; then + AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found]) + fi + fi +fi +# Check if we're building with SELinux support. +if test "x$have_selinux" = xyes; then + AC_DEFINE(HAVE_SELINUX, 1, [SELinux support]) + + # See if we have the libaudit library + AC_CHECK_LIB(audit, audit_log_user_avc_message, + have_libaudit=yes, have_libaudit=no) + if test "x$have_libaudit" = xyes; then + AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support]) + fi + AC_SUBST(have_libaudit) + + # See if we have the libcap library + AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no) + if test "x$have_libcap" = xyes; then + AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support]) + fi + AC_SUBST(have_libcap) +fi +AC_SUBST(have_selinux) + +CPPUNDEFS= +dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE. +dnl Since we are building the implementations of the fortified functions here, +dnl having the macro defined interacts very badly. +AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source, +[AC_TRY_COMPILE([], [ +#ifdef _FORTIFY_SOURCE +# error bogon +#endif], + [libc_cv_predef_fortify_source=no], + [libc_cv_predef_fortify_source=yes])]) +if test $libc_cv_predef_fortify_source = yes; then + CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE" +fi +AC_SUBST(CPPUNDEFS) + +# Some linkers on some architectures support __ehdr_start but with +# bugs. Make sure usage of it does not create relocations in the +# output (as the linker should resolve them all for us). +AC_CACHE_CHECK([whether the linker provides working __ehdr_start], + libc_cv_ehdr_start, [ +old_CFLAGS="$CFLAGS" +old_LDFLAGS="$LDFLAGS" +old_LIBS="$LIBS" +CFLAGS="$CFLAGS -fPIC" +LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp" +LIBS= +AC_LINK_IFELSE([AC_LANG_SOURCE([ +typedef struct { + char foo; + long val; +} Ehdr; +extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden"))); +long ehdr (void) { return __ehdr_start.val; } +])], + [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then + libc_cv_ehdr_start=broken + else + libc_cv_ehdr_start=yes + fi], [libc_cv_ehdr_start=no]) +CFLAGS="$old_CFLAGS" +LDFLAGS="$old_LDFLAGS" +LIBS="$old_LIBS" +]) +if test "$libc_cv_ehdr_start" = yes; then + AC_DEFINE([HAVE_EHDR_START]) +elif test "$libc_cv_ehdr_start" = broken; then + AC_MSG_WARN([linker is broken -- you should upgrade]) +fi + +AC_CACHE_CHECK(for __builtin_trap with no external dependencies, + libc_cv_builtin_trap, [dnl +libc_cv_builtin_trap=no +AC_TRY_COMPILE([], [__builtin_trap ()], [ +libc_undefs=`$NM -u conftest.o | + LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \ + 2>&AS_MESSAGE_LOG_FD` || { + AC_MSG_ERROR([confusing output from $NM -u]) +} +echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'" +if test -z "$libc_undefs"; then + libc_cv_builtin_trap=yes +fi])]) +if test $libc_cv_builtin_trap = yes; then + AC_DEFINE([HAVE_BUILTIN_TRAP]) +fi + +dnl C++ feature tests. +AC_LANG_PUSH([C++]) + +AC_CACHE_CHECK([whether the C++ compiler supports thread_local], + libc_cv_cxx_thread_local, [ +old_CXXFLAGS="$CXXFLAGS" +CXXFLAGS="$CXXFLAGS -std=gnu++11" +AC_COMPILE_IFELSE([AC_LANG_SOURCE([ +#include <thread> + +// Compiler support. +struct S +{ + S (); + ~S (); +}; +thread_local S s; +S * get () { return &s; } + +// libstdc++ support. +#ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL +#error __cxa_thread_atexit_impl not supported +#endif +])], + [libc_cv_cxx_thread_local=yes], + [libc_cv_cxx_thread_local=no]) +CXXFLAGS="$old_CXXFLAGS" +]) +AC_SUBST(libc_cv_cxx_thread_local) + +AC_LANG_POP([C++]) +dnl End of C++ feature tests. + +### End of automated tests. +### Now run sysdeps configure fragments. + +# They also can set these variables. +use_ldconfig=no +ldd_rewrite_script=no +libc_cv_sysconfdir=$sysconfdir +libc_cv_localstatedir=$localstatedir +libc_cv_gcc_unwind_find_fde=no +libc_cv_idn=no + +# Iterate over all the sysdep directories we will use, running their +# configure fragments. +for dir in $sysnames; do + case $dir in + /*) dest=$dir ;; + *) dest=$srcdir/$dir ;; + esac + if test -r $dest/configure; then + AC_MSG_RESULT(running configure fragment for $dir) + . $dest/configure + fi +done + +if test x"$build_mathvec" = xnotset; then + build_mathvec=no +fi +LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec]) + +AC_SUBST(libc_extra_cflags) +AC_SUBST(libc_extra_cppflags) + +if test x$libc_cv_gcc_unwind_find_fde = xyes; then + AC_DEFINE(EXPORT_UNWIND_FIND_FDE) +fi +AC_SUBST(libc_cv_gcc_unwind_find_fde) + +# A sysdeps configure fragment can reset this if IFUNC is not actually +# usable even though the assembler knows how to generate the symbol type. +if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then + AC_DEFINE(HAVE_IFUNC) +fi + +if test x"$libc_cv_gcc_indirect_function" = xyes; then + AC_DEFINE(HAVE_GCC_IFUNC) +fi + +# This is far from the AC_ARG_ENABLE that sets it so that a sysdeps +# configure fragment can override the value to prevent this AC_DEFINE. +AC_SUBST(use_nscd) +if test "x$use_nscd" != xno; then + AC_DEFINE([USE_NSCD]) +fi +if test "x$build_nscd" = xdefault; then + build_nscd=$use_nscd +fi + +AC_SUBST(libc_cv_slibdir) +AC_SUBST(libc_cv_rtlddir) +AC_SUBST(libc_cv_complocaledir) +AC_SUBST(libc_cv_sysconfdir) +AC_SUBST(libc_cv_localstatedir) +AC_SUBST(libc_cv_rootsbindir) + +if test x$use_ldconfig = xyes; then + AC_DEFINE(USE_LDCONFIG) +fi +AC_SUBST(use_ldconfig) +AC_SUBST(ldd_rewrite_script) + +AC_SUBST(static) +AC_SUBST(shared) + +AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default, +[libc_cv_pic_default=yes +cat > conftest.c <<EOF +#if defined __PIC__ || defined __pic__ || defined PIC || defined pic +# error PIC is default. +#endif +EOF +if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then + libc_cv_pic_default=no +fi +rm -f conftest.*]) +AC_SUBST(libc_cv_pic_default) + +AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default, +[libc_cv_pie_default=yes +cat > conftest.c <<EOF +#if defined __PIE__ || defined __pie__ || defined PIE || defined pie +# error PIE is default. +#endif +EOF +if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then + libc_cv_pie_default=no +fi +rm -f conftest.*]) +AC_SUBST(libc_cv_pie_default) + +AC_SUBST(profile) +AC_SUBST(static_nss) + +AC_SUBST(DEFINES) + +dnl See sysdeps/mach/configure.ac for this variable. +AC_SUBST(mach_interface_list) + +VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h` +RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h` +AC_SUBST(VERSION) +AC_SUBST(RELEASE) + +AC_CONFIG_FILES([config.make Makefile]) +AC_CONFIG_COMMANDS([default],[[ +case $CONFIG_FILES in *config.make*) +echo "$config_vars" >> config.make;; +esac +test -d bits || mkdir bits]],[[config_vars='$config_vars']]) +AC_OUTPUT |