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
-AC_CHECK_TOOL(READELF, readelf, false)
+# 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++])
+AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+ [libc_cv_cxx_link_ok=yes],
+ [libc_cv_cxx_link_ok=no])
+AC_LANG_POP([C++])])
+AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
AC_MSG_ERROR([you must configure in a separate build directory])
[profile=$enableval],
[profile=no])
-AC_ARG_ENABLE([oldest-abi],
- AC_HELP_STRING([--enable-oldest-abi=ABI],
- [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
- [oldest_abi=$enableval],
- [oldest_abi=no])
-if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
- oldest_abi=default
-else
- AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
-fi
-AC_SUBST(oldest_abi)
-
AC_ARG_ENABLE([hardcoded-path-in-tests],
AC_HELP_STRING([--enable-hardcoded-path-in-tests],
[hardcode newly built glibc path in tests @<:@default=no@:>@]),
[])
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]),
AC_DEFINE(HAVE_PT_CHOWN)
fi
-# The way shlib-versions is used to generate soversions.mk 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 shlib-versions can
-# tell. This doesn't get used much beyond that, so it's fairly safe.
+# 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*)
;;
;;
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 $os, and changes them whenever convenient.
os=$config_os
base_os=''
-# config.guess on some IBM machines says `rs6000' instead of `powerpc'.
-# Unify this here.
-if test "$machine" = rs6000; then
- machine="powerpc"
-fi
-
-# Braindead PowerPC box with absolutely no FPU.
-case "$machine-$host_os" in
- powerpc*-*soft)
- with_fp=no
- ;;
-esac
-
submachine=
AC_ARG_WITH([cpu],
AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
esac
])
+# An preconfigure script can set this when it wants to disable the sanity
+# check below.
+libc_config_ok=no
+
dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
-# An add-on can set this when it wants to disable the sanity check below.
-libc_config_ok=no
-
dnl Having this here, though empty, makes sure that if add-ons' fragments
dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
dnl our AC_OUTPUT will actually use it.
esac
fi
-dnl We need to use [ and ] for other purposes for a while now.
-changequote(,)dnl
-# Expand the configuration machine name into a subdirectory by architecture
-# type and particular chip. If an add-on configure fragment already set
-# base_machine, we don't change it.
-test -n "$base_machine" || case "$machine" in
-i[4567]86) base_machine=i386 machine=i386/$machine ;;
-powerpc64*) base_machine=powerpc machine=powerpc/powerpc64 ;;
-powerpc*) base_machine=powerpc machine=powerpc/powerpc32 ;;
-s390) base_machine=s390 machine=s390/s390-32 ;;
-s390x) base_machine=s390 machine=s390/s390-64 ;;
-sh3*) base_machine=sh machine=sh/sh3 ;;
-sh4*) base_machine=sh machine=sh/sh4 ;;
-sparc | sparcv[67])
- base_machine=sparc machine=sparc/sparc32 ;;
-sparcv8 | supersparc | hypersparc)
- base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
-sparcv8plus | sparcv8plusa | sparcv9)
- base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
-sparcv8plusb | sparcv9b)
- base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
-sparcv9v)
- base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
-sparcv9v2)
- base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
-sparc64)
- base_machine=sparc machine=sparc/sparc64 ;;
-sparc64b)
- base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
-sparc64v)
- base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
-sparc64v2)
- base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
-*) base_machine=$machine ;;
-esac
-changequote([,])dnl
+# Set base_machine if not set by a preconfigure fragment.
+test -n "$base_machine" || base_machine=$machine
AC_SUBST(base_machine)
-if test "$base_machine" = "i386"; then
- AC_DEFINE(USE_REGPARMS)
-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
LIBC_PROG_BINUTILS
-# Accept binutils 2.20 or newer.
+# 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.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
+ [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+ AS=: critic_missing="$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.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
+ [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+ LD=: critic_missing="$critic_missing ld")
# These programs are version sensitive.
AC_CHECK_TOOL_PREFIX
-AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
- [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
- critic_missing="$critic_missing gcc")
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="$critic_missing make")
MSGFMT=: aux_missing="$aux_missing msgfmt")
AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
[GNU texinfo.* \([0-9][0-9.]*\)],
- [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
+ [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]* \([0-9]*\.[0-9.]*\)],
[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__ < 6)
+#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
fi
AC_PATH_PROG(INSTALL_INFO, install-info, no,
$PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
-AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
+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 libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
AC_TRY_COMPILE(dnl
fi
fi
+if test $libc_cv_visibility_attribute = yes; then
+ AC_CACHE_CHECK(linker support for protected data symbol,
+ libc_cv_protected_data,
+ [cat > conftest.c <<EOF
+ int bar __attribute__ ((visibility ("protected"))) = 1;
+EOF
+ libc_cv_protected_data=no
+ if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -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
+ libc_cv_protected_data=yes
+ fi
+ fi
+ rm -f conftest.*
+ ])
+else
+ libc_cv_protected_data=no
+fi
+AC_SUBST(libc_cv_protected_data)
+
if test $libc_cv_visibility_attribute = yes; then
AC_CACHE_CHECK(for broken __attribute__((visibility())),
libc_cv_broken_visibility_attribute,
[libc_cv_z_initfirst=yes],
[AC_MSG_ERROR(linker with -z initfirst support required)])
-# Add-on fragments can set these for other machines.
-libc_commonpagesize=${libc_commonpagesize:-no}
-libc_relro_required=${libc_relro_required:-no}
-case "$base_machine" in
- i[[34567]]86 | x86_64 | powerpc* | s390*)
- libc_commonpagesize=0x1000
- libc_relro_required=yes
- ;;
- sparc*)
- libc_commonpagesize=0x2000
- libc_relro_required=yes
- ;;
-esac
-
-if test $libc_commonpagesize != no; then
- AC_CACHE_CHECK(for -z relro option,
- libc_cv_z_relro, [dnl
- libc_cv_z_relro=no
- AC_LANG_CONFTEST([AC_LANG_SOURCE([[
-int _start (void) { return 42; }
-extern void _exit (int);
-/* Since these pointers are const, they should go in rodata.
- Since they refer to functions that have to be resolved by
- dynamic linking, they should instead go in RELRO data. */
-const void *const relro[] = { &_start, &_exit, 0 };
-/* GNU ld fails to produce RELRO data when it's very small and there is no
- normal writable data following it, or if only uninitialized (.bss) data
- follows it, or only very small writable data. */
-int data[0x10000] = { 1, };
-]])])
- cat > conftest.awk <<\EOF
-BEGIN {
- result = "no"
- commonpagesize = strtonum(commonpagesize)
-}
-{ print "LINE:", $0 > "/dev/stderr" }
-$1 == "GNU_RELRO" {
- vaddr = strtonum($3)
- memsz = strtonum($6)
- end = vaddr + memsz
- printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
- vaddr, memsz, end, commonpagesize > "/dev/stderr"
- result = (end % commonpagesize == 0) ? "yes" : "broken"
-}
-END { print result }
-EOF
- AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
- -fPIC -shared -o conftest.so conftest.c
- -nostartfiles -nostdlib
- -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
- AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
- AC_TRY_COMMAND([
- $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
- conftest.ph > conftest.cps
- ]) &&
- libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
- rm -f conftest*])
- if { test "x$libc_relro_required" = xyes &&
- test "x$libc_cv_z_relro" != xyes
- }
- then
- AC_MSG_ERROR(linker with -z relro support required)
- fi
-else
- AC_MSG_WARN([missing architecture parameter to check for working -z relro])
-fi
-
AC_CACHE_CHECK(for -Bgroup option,
libc_cv_Bgroup, [dnl
cat > conftest.c <<EOF
AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
fi
-AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
-case $machine in
- sparc/sparc64*) cfi_offset=2047;;
- *) cfi_offset=0;;
-esac
-cat > conftest.s <<EOF
- .text
- .type func,%function
-func:
- .cfi_startproc
- .cfi_remember_state
- .cfi_rel_offset 1, $cfi_offset
- .cfi_endproc
-EOF
-if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
- libc_cv_asm_cfi_directives=yes
-else
- libc_cv_asm_cfi_directives=no
-fi
-rm -f conftest*])
-if test $libc_cv_asm_cfi_directives = yes; then
- AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
-fi
-
AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
cat > conftest.c <<\EOF
_start () {}
fi
AC_SUBST(exceptions)dnl
-if test "$host_cpu" = powerpc ; then
-# Check for a bug present in at least versions 2.8.x of GCC
-# and versions 1.0.x of EGCS.
-AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
-AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
- libc_cv_c_asmcr0_bug='no',
- libc_cv_c_asmcr0_bug='yes')])
-if test "$libc_cv_c_asmcr0_bug" != 'no'; then
- AC_DEFINE(BROKEN_PPC_ASM_CR0)
-fi
-fi
-
AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
cat > conftest.c <<\EOF
void zero (void *x)
fi
libc_extra_cppflags=
-AC_CACHE_CHECK([whether the linker provides __ehdr_start],
+# Some linkers on some architectures support __ehdr_start but with
+# bugs. Make sure usage of it does not create relocations in the
+# output (as the linker should resolve them all for us).
+AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
libc_cv_ehdr_start, [
old_CFLAGS="$CFLAGS"
old_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
LIBS=
AC_LINK_IFELSE([AC_LANG_SOURCE([
-extern const char __ehdr_start __attribute__ ((visibility ("hidden")));
-const char *ehdr (void) { return &__ehdr_start; }
+typedef struct {
+ char foo;
+ long val;
+} Ehdr;
+extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
+long ehdr (void) { return __ehdr_start.val; }
])],
- [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no])
+ [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
+ libc_cv_ehdr_start=broken
+ else
+ libc_cv_ehdr_start=yes
+ fi], [libc_cv_ehdr_start=no])
CFLAGS="$old_CFLAGS"
LDFLAGS="$old_LDFLAGS"
LIBS="$old_LIBS"
])
-if test $libc_cv_ehdr_start = yes; then
+if test "$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 $libc_cv_builtin_trap = yes; then
+ AC_DEFINE([HAVE_BUILTIN_TRAP])
fi
### End of automated tests.
fi
done
+if test x"$build_mathvec" = xnotset; then
+ build_mathvec=no
+fi
+LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
+
AC_SUBST(libc_extra_cflags)
AC_SUBST(libc_extra_cppflags)
rm -f conftest.*])
AC_SUBST(libc_cv_pic_default)
+AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
+[libc_cv_pie_default=yes
+cat > conftest.c <<EOF
+#if defined __PIE__ || defined __pie__ || defined PIE || defined pie
+# error PIE is default.
+#endif
+EOF
+if eval "${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)
projects / thirdparty / glibc.git / blobdiff