diff options
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 42 |
1 files changed, 42 insertions, 0 deletions
@@ -3916,6 +3916,36 @@ fi { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_gnu_indirect_function" >&5 $as_echo "$libc_cv_ld_gnu_indirect_function" >&6; } +# Check if gcc supports attribute ifunc as it is used in libc_ifunc macro. +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for gcc attribute ifunc support" >&5 +$as_echo_n "checking for gcc attribute ifunc support... " >&6; } +if ${libc_cv_gcc_indirect_function+:} false; then : + $as_echo_n "(cached) " >&6 +else + 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>&5 \ + 2>&5 ; then + if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&5; then + libc_cv_gcc_indirect_function=yes + fi +fi +rm -f conftest* +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_indirect_function" >&5 +$as_echo "$libc_cv_gcc_indirect_function" >&6; } + if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then if test x"$multi_arch" = xyes; then as_fn_error $? "--enable-multi-arch support requires assembler and linker support" "$LINENO" 5 @@ -3923,6 +3953,13 @@ if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then multi_arch=no fi fi +if test x"$libc_cv_gcc_indirect_function" != xyes && + test x"$multi_arch" = xyes; then + { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: --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" >&5 +$as_echo "$as_me: WARNING: --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" >&2;} +fi multi_arch_d= if test x"$multi_arch" != xno; then multi_arch_d=/multiarch @@ -6518,6 +6555,11 @@ if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then fi +if test x"$libc_cv_gcc_indirect_function" = xyes; then + $as_echo "#define HAVE_GCC_IFUNC 1" >>confdefs.h + +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. |