AC_SUBST(cross_compiling)
AC_PROG_CPP
AC_CHECK_TOOL(READELF, readelf, false)
+AC_CHECK_TOOL(OBJDUMP, objdump, false)
# We need the C++ compiler only for testing.
AC_PROG_CXX
AS_HELP_STRING([--with-default-link],
[do not use explicit linker scripts]),
[use_default_link=$withval],
- [use_default_link=default])
+ [use_default_link=no])
dnl Additional build flags injection.
AC_ARG_WITH([nonshared-cflags],
[extra_nonshared_cflags=$withval],
[extra_nonshared_cflags=])
AC_SUBST(extra_nonshared_cflags)
+AC_ARG_WITH([rtld-early-cflags],
+ AS_HELP_STRING([--with-rtld-early-cflags=CFLAGS],
+ [build early initialization with additional CFLAGS]),
+ [rtld_early_cflags=$withval],
+ [rtld_early_cflags=])
+AC_SUBST(rtld_early_cflags)
+
+AC_ARG_WITH([timeoutfactor],
+ AS_HELP_STRING([--with-timeoutfactor=NUM],
+ [specify an integer to scale the timeout]),
+ [timeoutfactor=$withval],
+ [timeoutfactor=1])
+AC_DEFINE_UNQUOTED(TIMEOUTFACTOR, $timeoutfactor)
AC_ARG_ENABLE([sanity-checks],
AS_HELP_STRING([--disable-sanity-checks],
[build profiled library @<:@default=no@:>@]),
[profile=$enableval],
[profile=no])
-AC_ARG_ENABLE([static-pie],
- AS_HELP_STRING([--enable-static-pie],
- [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
- [static_pie=$enableval],
- [static_pie=no])
+AC_ARG_ENABLE([default-pie],
+ AS_HELP_STRING([--disable-default-pie],
+ [Do not build glibc programs and the testsuite as PIE @<:@default=no@:>@]),
+ [default_pie=$enableval],
+ [default_pie=yes])
AC_ARG_ENABLE([timezone-tools],
AS_HELP_STRING([--disable-timezone-tools],
[do not install timezone tools @<:@default=install@:>@]),
test -n "$base_machine" || base_machine=$machine
AC_SUBST(base_machine)
+### 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 2.25 or newer.
+libc_cv_with_lld=no
+case $($LD --version) in
+ "GNU gold"*)
+ # Accept gold 1.14 or higher
+ AC_CHECK_PROG_VER(LD, $LD, --version,
+ [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
+ [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
+ LD=: critic_missing="$critic_missing GNU gold")
+ ;;
+ "LLD"*)
+ # Accept LLD 13.0.0 or higher
+ AC_CHECK_PROG_VER(LD, $LD, --version,
+ [LLD.* \([0-9][0-9]*\.[0-9.]*\)],
+ [1[3-9].*|[2-9][0-9].*],
+ LD=: critic_missing="$critic_missing LLD")
+ libc_cv_with_lld=yes
+ ;;
+ *)
+ AC_CHECK_PROG_VER(LD, $LD, --version,
+ [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
+ [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+ LD=: critic_missing="$critic_missing GNU ld")
+ ;;
+esac
+LIBC_CONFIG_VAR([with-lld], [$libc_cv_with_lld])
+
+# These programs are version sensitive.
+AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
+ [GNU Make[^0-9]*\([0-9][0-9.]*\)],
+ [[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_CHECK_PROG_VER(BISON, bison, --version,
+ [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
+ [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
+
+AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
+AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
+#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
+#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_PROG_VER(PYTHON_PROG, python3 python, --version,
+ [Python \([0-9][0-9.]*\)],
+ [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
+ critic_missing="$critic_missing python")
+PYTHON="$PYTHON_PROG -B"
+AC_SUBST(PYTHON)
+
+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.])
+
+
# Determine whether to use fpu or nofpu sysdeps directories.
AC_CACHE_CHECK([for use of fpu sysdeps directories],
libc_cv_with_fp, [dnl
# GCC 8+ emits a warning for alias with incompatible types and it might
# fail to build ifunc resolvers aliases to either weak or internal
# symbols. Disables multiarch build in this case.
- if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
+ if test x"$libc_cv_gcc_incompatible_alias" = xyes; then
AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
if test x"$multi_arch" = xyes; then
AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
# The other names were emitted during the scan.
AC_MSG_RESULT($default_sysnames)
-
-### 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 2.25 or newer.
-AC_CHECK_PROG_VER(AS, $AS, --version,
- [GNU assembler.* \([0-9]*\.[0-9.]*\)],
- [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
- AS=: critic_missing="$critic_missing as")
-
-if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
- # Accept gold 1.14 or higher
- AC_CHECK_PROG_VER(LD, $LD, --version,
- [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
- [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
- LD=: critic_missing="$critic_missing GNU gold")
-else
- AC_CHECK_PROG_VER(LD, $LD, --version,
- [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
- [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
- LD=: critic_missing="$critic_missing GNU ld")
-fi
-
-# These programs are version sensitive.
-AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
- [GNU Make[^0-9]*\([0-9][0-9.]*\)],
- [[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_CHECK_PROG_VER(BISON, bison, --version,
- [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
- [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
-
-AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
-AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
-#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
-#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_PROG_VER(PYTHON_PROG, python3 python, --version,
- [Python \([0-9][0-9.]*\)],
- [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
- critic_missing="$critic_missing python")
-PYTHON="$PYTHON_PROG -B"
-AC_SUBST(PYTHON)
-
-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.)
# copy of those headers in Makerules.
if test -n "$CXX"; then
find_cxx_header () {
- echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
- | sed -n "\,$1:,{s/:\$//;p}"
+ echo "#include <$1>" | $CXX -H -fsyntax-only -x c++ - 2>&1 \
+ | $AWK '$1 == "."{print $2}'
}
CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
CXX_CMATH_HEADER="$(find_cxx_header cmath)"
AC_CACHE_CHECK(linker support for INSERT in linker script,
libc_cv_insert,
[cat > conftest.c <<EOF
- const int __attribute__ ((section(".bar"))) bar = 0x12345678;
+ int __attribute__ ((section(".bar"))) bar = 0x12345678;
int test (void) { return bar; }
EOF
cat > conftest.t <<EOF
fi
AC_SUBST(ASFLAGS_config)
-AC_CACHE_CHECK(for -z combreloc,
- libc_cv_z_combreloc, [dnl
-cat > conftest.c <<EOF
-extern int bar (int);
-extern int mumble;
-int foo (void) { return bar (mumble); }
-EOF
-if AC_TRY_COMMAND([${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)
[libc_cv_z_start_stop_gc=yes], [libc_cv_z_start_stop_gc=no])
LIBC_CONFIG_VAR([have-z-start-stop-gc], [$libc_cv_z_start_stop_gc])
+LIBC_LINKER_FEATURE([--depaudit], [-Wl,--depaudit,x],
+ [libc_cv_depaudit=yes], [libc_cv_depaudit=no])
+LIBC_CONFIG_VAR([have-depaudit], [$libc_cv_depaudit])
+
+LIBC_LINKER_FEATURE([-z pack-relative-relocs],
+ [-Wl,-z,pack-relative-relocs],
+ [libc_cv_dt_relr=yes], [libc_cv_dt_relr=no])
+LIBC_CONFIG_VAR([have-dt-relr], [$libc_cv_dt_relr])
+
LIBC_LINKER_FEATURE([--no-dynamic-linker],
[-Wl,--no-dynamic-linker],
[libc_cv_no_dynamic_linker=yes],
AC_SUBST(libc_cv_fpie)
-AC_CACHE_CHECK(for --hash-style option,
- libc_cv_hashstyle, [dnl
-cat > conftest.c <<EOF
-int _start (void) { return 42; }
-EOF
-if AC_TRY_COMMAND([${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=$libc_cv_use_default_link
-fi
-
AC_CACHE_CHECK(for GLOB_DAT reloc,
libc_cv_has_glob_dat, [dnl
cat > conftest.c <<EOF
rm -f conftest*])
AC_SUBST(libc_cv_has_glob_dat)
-AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
-cat > conftest.c <<EOF
-int foo;
-EOF
-if AC_TRY_COMMAND([${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 $libc_cv_fno_toplevel_reorder = yes; then
- fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
-else
- fno_unit_at_a_time=-fno-unit-at-a-time
-fi
-AC_SUBST(fno_unit_at_a_time)
-
AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
[dnl
cat > conftest.c <<EOF
i = 10;
}
EOF
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
- conftest.c 1>&AS_MESSAGE_LOG_FD])
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=gnu2 -nostdlib -nostartfiles
+ conftest.c -o conftest 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_mtls_dialect_gnu2=yes
else
AC_SUBST(libc_cv_mtls_dialect_gnu2)
LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
+dnl clang emits an warning for a double alias redirection, to warn the
+dnl original symbol is sed even when weak definition overriddes it.
+dnl It is a usual pattern for weak_alias, where multiple alias point to
+dnl same symbol.
+AC_CACHE_CHECK([if -Wno-ignored-attributes is required for aliases],
+ libc_cv_wno_ignored_attributes, [dnl
+cat > conftest.c <<EOF
+void __foo (void)
+{
+}
+extern __typeof (__foo) foo __attribute__ ((weak, alias ("__foo")));
+extern __typeof (__foo) bar __attribute__ ((weak, alias ("foo")));
+EOF
+libc_cv_wno_ignored_attributes=""
+if ! AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c])
+then
+ libc_cv_wno_ignored_attributes="-Wno-ignored-attributes"
+fi
+rm -f conftest*])
+LIBC_CONFIG_VAR([config-cflags-wno-ignored-attributes],
+ [$libc_cv_wno_ignored_attributes])
+
AC_CACHE_CHECK(whether cc puts quotes around section names,
libc_cv_have_section_quotes,
[cat > conftest.c <<EOF
fi
AC_SUBST(libc_cv_cc_submachine)
+dnl Determine if compiler supports -fsignaling-nans
+AC_CACHE_CHECK([for compiler option that -fsignaling-nans],
+ libc_cv_cc_signaling_nans, [dnl
+LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans],
+ [libc_cv_cc_signaling_nans=-fsignaling-nans],
+ [libc_cv_cc_signaling_nans=])
+])
+LIBC_CONFIG_VAR([config-cflags-signaling-nans],
+ [$libc_cv_cc_signaling_nans])
+
AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
__attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
cat > conftest.c <<EOF
fi
AC_SUBST(CPPUNDEFS)
-# Some linkers on some architectures support __ehdr_start but with
-# bugs. Make sure usage of it does not create relocations in the
-# output (as the linker should resolve them all for us).
-AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
- libc_cv_ehdr_start, [
-old_CFLAGS="$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
-
dnl Starting with binutils 2.35, GAS can attach multiple symbol versions
dnl to one symbol (PR 23840).
AC_CACHE_CHECK(whether the assembler requires one version per symbol,
libc_cv_pic_default=no
fi
rm -f conftest.*])
-AC_SUBST(libc_cv_pic_default)
+LIBC_CONFIG_VAR([build-pic-default], [$libc_cv_pic_default])
AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
[libc_cv_cc_pie_default=yes
libc_cv_cc_pie_default=no
fi
rm -f conftest.*])
-libc_cv_pie_default=$libc_cv_cc_pie_default
-AC_SUBST(libc_cv_cc_pie_default)
-AC_SUBST(libc_cv_pie_default)
-
-# Set the `multidir' variable by grabbing the variable from the compiler.
-# We do it once and save the result in a generated makefile.
-libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
-AC_SUBST(libc_cv_multidir)
+LIBC_CONFIG_VAR([cc-pie-default], [$libc_cv_cc_pie_default])
+
+AC_MSG_CHECKING(if we can build programs as PIE)
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifdef PIE_UNSUPPORTED
+# error PIE is not supported
+#endif]])], [libc_cv_pie_supported=yes], [libc_cv_pie_supported=no])
+AC_MSG_RESULT($libc_cv_pie_supported)
+# Disable build-pie-default if target does not support it or glibc is
+# configured with --disable-default-pie.
+if test "x$default_pie" = xno; then
+ build_pie_default=no
+else
+ build_pie_default=$libc_cv_pie_supported
+fi
+LIBC_CONFIG_VAR([build-pie-default], [$build_pie_default])
-if test "$static_pie" = yes; then
- # Check target support for static PIE
+AC_MSG_CHECKING(if we can build static PIE programs)
+libc_cv_static_pie_supported=$libc_cv_pie_supported
+if test "x$libc_cv_pie_supported" != xno \
+ -a "$libc_cv_no_dynamic_linker" = yes; then
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifndef SUPPORT_STATIC_PIE
# error static PIE is not supported
-#endif]])], , AC_MSG_ERROR([the architecture does not support static PIE]))
- # The linker must support --no-dynamic-linker.
- if test "$libc_cv_no_dynamic_linker" != yes; then
- AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
- fi
- # Default to PIE.
- libc_cv_pie_default=yes
+#endif]])], [libc_cv_static_pie_supported=yes],
+ [libc_cv_static_pie_supported=no])
+fi
+AC_MSG_RESULT($libc_cv_static_pie_supported)
+
+# Enable static-pie only if it is available and glibc isn't configured
+# with --disable-default-pie.
+if test "x$default_pie" = xno; then
+ libc_cv_static_pie=no
+else
+ libc_cv_static_pie=$libc_cv_static_pie_supported
+fi
+if test "$libc_cv_static_pie" = "yes"; then
AC_DEFINE(ENABLE_STATIC_PIE)
fi
-LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
+LIBC_CONFIG_VAR([enable-static-pie], [$libc_cv_static_pie])
+
+# Set the `multidir' variable by grabbing the variable from the compiler.
+# We do it once and save the result in a generated makefile.
+libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
+AC_SUBST(libc_cv_multidir)
AC_SUBST(profile)
AC_SUBST(static_nss)