diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 8045d44dd0..e983fd8faa 100644 --- a/configure.ac +++ b/configure.ac @@ -671,6 +671,41 @@ if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \ fi rm -f conftest*]) +# Check if linker supports textrel relocation with ifunc (used on elf/tests). +# Note that it relies on libc_cv_ld_gnu_indirect_function test above. +AC_CACHE_CHECK([whether the linker supports textrels along with ifunc], + libc_cv_textrel_ifunc, [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 +.text +.globl address +address: +#ifdef _LP64 +.quad address +#else +.long address +#endif +EOF +libc_cv_textrel_ifunc=no +if test $libc_cv_ld_gnu_indirect_function = yes; then + if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp -pie -o conftest conftest.S); then + libc_cv_textrel_ifunc=yes + fi +fi +rm -f conftest*]) +AC_SUBST(libc_cv_textrel_ifunc) + # Check if gcc warns about alias for function with incompatible types. AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types], libc_cv_gcc_incompatible_alias, [dnl |