AC_LANG_POP([C++])])
AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
-if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
+if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
AC_MSG_ERROR([you must configure in a separate build directory])
fi
[bindnow=$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_MSG_ERROR([
cannot find NSS headers with lowlevel hash function interfaces]))
old_LIBS="$LIBS"
+ old_LDFLAGS="$LDFLAGS"
LIBS="$LIBS -lfreebl3"
AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
libc_cv_nss_crypt=yes,
AC_MSG_ERROR([
cannot link program using lowlevel NSS hash functions]))
+ # Check to see if there is a static NSS cryptographic library.
+ # If there isn't then we can't link anything with libcrypt.a,
+ # and that might mean disabling some static tests.
+ LDFLAGS="$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="$old_LIBS"
else
libc_cv_nss_crypt=no
+ libc_cv_static_nss_crypt=no
fi
AC_SUBST(libc_cv_nss_crypt)
+AC_SUBST(libc_cv_static_nss_crypt)
AC_ARG_ENABLE([obsolete-rpc],
AC_DEFINE(HAVE_PT_CHOWN)
fi
+AC_ARG_ENABLE([tunables],
+ [AS_HELP_STRING([--enable-tunables],
+ [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
+ [have_tunables=$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
# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
AC_SUBST(add_on_subdirs)
-###
-### I put this here to prevent those annoying emails from people who cannot
-### read and try to compile glibc on unsupported platforms. --drepper
###
### By using the undocumented --enable-hacker-mode option for configure
### one can skip this test to make the configuration not fail for unsupported
*-linux* | *-gnu*)
;;
*)
- echo "*** The GNU C library is currently not available for this platform."
- echo "*** So far nobody cared to port it and if there is no volunteer it"
- echo "*** might never happen. So, if you have interest to see glibc on"
- echo "*** this platform visit"
- echo "*** http://www.gnu.org/software/libc/porting.html"
- echo "*** and join the group of porters"
- exit 1
+ AC_MSG_ERROR([
+*** The GNU C library is currently unavailable for this platform.
+*** If you are interested in seeing glibc on this platform visit
+*** the "How to submit a new port" in the wiki:
+*** https://sourceware.org/glibc/wiki/#Development
+*** and join the community!])
;;
esac
fi
test -n "$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
EOF
libc_cv_ld_gnu_indirect_function=no
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
- -nostartfiles -nostdlib \
+ -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
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"$multi_arch" = xyes; then
AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
multi_arch=no
fi
fi
+if test x"$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
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 will be disabled.
+*** 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
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
void _start() { glibc_conftest_frobozz = 1; }
EOF
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
- -nostartfiles -nostdlib \
+ -nostartfiles -nostdlib $no_ssp \
-o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
libc_cv_asm_set_directive=yes
else
int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
libc_cv_protected_data=no
- if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
+ 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 conftest.c -o conftest conftest.so); then
+ if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
libc_cv_protected_data=yes
fi
fi
AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
fi
-LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
- [libc_cv_z_nodelete=yes],
- [AC_MSG_ERROR(linker with -z nodelete support required)])
-
-LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
- [libc_cv_z_nodlopen=yes],
- [AC_MSG_ERROR(linker with -z nodlopen support required)])
-
-LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
- [libc_cv_z_initfirst=yes],
- [AC_MSG_ERROR(linker with -z initfirst support required)])
-
ASFLAGS_config=
AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
libc_cv_as_noexecstack, [dnl
int foo (void) { return bar (mumble); }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
- -fPIC -shared -o conftest.so conftest.c
+ -fPIC -shared $no_ssp -o conftest.so conftest.c
-nostdlib -nostartfiles
-Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
then
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
-fPIC -shared -o conftest.so conftest.c
-Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
then
use_default_link=$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 -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
+${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
then
:
else
fi
AC_SUBST(fno_unit_at_a_time)
-AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
-LIBC_TRY_CC_OPTION([$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 $CPPFLAGS -Werror -fstack-protector-strong],
- [libc_cv_ssp_strong=yes],
- [libc_cv_ssp_strong=no])
-])
-
-stack_protector=
-if test "$libc_cv_ssp_strong" = "yes"; then
- stack_protector="-fstack-protector-strong"
-elif test "$libc_cv_ssp" = "yes"; then
- stack_protector="-fstack-protector"
+AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
+[dnl
+cat > conftest.c <<EOF
+__thread int i;
+void foo (void)
+{
+ i = 10;
+}
+EOF
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
+ conftest.c 1>&AS_MESSAGE_LOG_FD])
+then
+ libc_cv_mtls_dialect_gnu2=yes
+else
+ libc_cv_mtls_dialect_gnu2=no
fi
-AC_SUBST(stack_protector)
+rm -f conftest*])
+AC_SUBST(libc_cv_mtls_dialect_gnu2)
+LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
AC_CACHE_CHECK(whether cc puts quotes around section names,
libc_cv_have_section_quotes,
AC_DEFINE(HAVE_SECTION_QUOTES)
fi
-AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
-cat > conftest.c <<\EOF
-_start () {}
-int __eh_pc;
-__throw () {}
-EOF
-dnl No \ in command here because it ends up inside ''.
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
- -nostdlib -nostartfiles -Wl,--no-whole-archive
- -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
- libc_cv_ld_no_whole_archive=yes
-else
- libc_cv_ld_no_whole_archive=no
-fi
-rm -f conftest*])
-if test $libc_cv_ld_no_whole_archive = no; then
- AC_MSG_ERROR([support for --no-whole-archive is needed])
-fi
-
AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
cat > conftest.c <<\EOF
void zero (void *x)
fi
AC_SUBST(CPPUNDEFS)
-dnl Check for silly hacked compilers inserting -fstack-protector.
-dnl This breaks badly for the early startup code we compile, since
-dnl the compiled code can refer to a magic machine-dependent location
-dnl for the canary value before we have sufficient setup for that to
-dnl work. It's also questionable to build all of libc with this flag
-dnl even when you're doing that for most applications you build, since
-dnl libc's code is so heavily-used and performance-sensitive. If we
-dnl ever really want to make that work, it should be enabled explicitly
-dnl in the libc build, not inherited from implicit compiler settings.
-AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
- libc_cv_predef_stack_protector, [
-AC_TRY_COMPILE([extern void foobar (char *);],
- [char large_array[2048]; foobar (large_array);], [
-libc_undefs=`$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'"
-# On some architectures, there are architecture-specific undefined
-# symbols (resolved by the linker), so filter out unknown symbols.
-# This will fail to produce the correct result if the compiler
-# defaults to -fstack-protector but this produces an undefined symbol
-# other than __stack_chk_fail. However, compilers like that have not
-# been encountered in practice.
-libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
-case "$libc_undefs" in
-foobar) libc_cv_predef_stack_protector=no ;;
-'__stack_chk_fail
-foobar') libc_cv_predef_stack_protector=yes ;;
-*) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
-esac],
- [AC_MSG_ERROR([test compilation failed])])
-])
-libc_extra_cflags=
-if test $libc_cv_predef_stack_protector = yes; then
- libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
-fi
-libc_extra_cppflags=
-
# 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).
old_LDFLAGS="$LDFLAGS"
old_LIBS="$LIBS"
CFLAGS="$CFLAGS -fPIC"
-LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
+LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
LIBS=
AC_LINK_IFELSE([AC_LANG_SOURCE([
typedef struct {
AC_DEFINE(HAVE_IFUNC)
fi
+if test x"$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)
AC_SUBST(libc_cv_slibdir)
AC_SUBST(libc_cv_rtlddir)
-AC_SUBST(libc_cv_localedir)
+AC_SUBST(libc_cv_complocaledir)
AC_SUBST(libc_cv_sysconfdir)
AC_SUBST(libc_cv_localstatedir)
AC_SUBST(libc_cv_rootsbindir)
projects / thirdparty / glibc.git / blobdiff