diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 523e8efe6a..c48c4c1ca6 100644 --- a/configure.in +++ b/configure.in @@ -1001,6 +1001,44 @@ EOF AC_SUBST(libc_cv_asm_protected_directive) AC_DEFINE(HAVE_PROTECTED) + if test $libc_cv_asm_protected_directive = yes; then + AC_CACHE_CHECK(whether __attribute__((visibility())) is supported, + libc_cv_visibility_attribute, + [cat > conftest.c <<EOF + int foo __attribute__ ((visibility ("hidden"))) = 1; + int bar __attribute__ ((visibility ("protected"))) = 1; +EOF + libc_cv_visibility_attribute=no + if ${CC-cc} -Werror -S conftest.c -o conftest.s >/dev/null 2>&1; then + if grep '\.hidden.*foo' conftest.s >/dev/null; then + if grep '\.protected.*bar' conftest.s >/dev/null; then + libc_cv_visibility_attribute=yes + fi + fi + fi + rm -f conftest.[cs] + ]) + if test $libc_cv_visibility_attribute = yes; then + AC_DEFINE(HAVE_VISIBILITY_ATTRIBUTE) + fi + fi + + if test $libc_cv_visibility_attribute = yes -a $gnu_ld = yes; then + AC_CACHE_CHECK(whether to put _rtld_local into .sdata section, + libc_cv_have_sdata_section, + [echo "int i;" > conftest.c + libc_cv_have_sdata_section=no + if ${CC-cc} -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \ + | grep '\.sdata' >/dev/null; then + libc_cv_have_sdata_section=yes + fi + rm -f conftest.c conftest.so + ]) + if test $libc_cv_have_sdata_section = yes; then + AC_DEFINE(HAVE_SDATA_SECTION) + fi + fi + AC_CACHE_CHECK(for -z nodelete option, libc_cv_z_nodelete, [dnl cat > conftest.c <<EOF |