diff options
Diffstat (limited to 'gold/configure.ac')
| -rw-r--r-- | gold/configure.ac | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/gold/configure.ac b/gold/configure.ac index 949c8c3b10..685e85bbbb 100644 --- a/gold/configure.ac +++ b/gold/configure.ac @@ -238,6 +238,8 @@ AC_DEFINE_UNQUOTED(GOLD_DEFAULT_BIG_ENDIAN, $default_big_endian, AC_DEFINE_UNQUOTED(GOLD_DEFAULT_OSABI, $default_osabi, [Default OSABI code]) +AC_CHECK_TOOL(NM, nm) + AC_PROG_CC AC_PROG_CXX AC_PROG_YACC @@ -374,18 +376,33 @@ AC_SUBST(RANDOM_SEED_CFLAGS) dnl On GNU/Linux ifunc is supported by the dynamic linker in glibc dnl 2.11 or later, and by binutils 2.20.1 or later. -AC_CACHE_CHECK([for glibc >= 2.11], [gold_cv_lib_glibc2_11], -[AC_COMPILE_IFELSE([ +AC_CACHE_CHECK([for glibc ifunc support], [gold_cv_lib_glibc_ifunc], +[save_LDFLAGS="$LDFLAGS" +LDFLAGS="$LDFLAGS -static" +AC_LINK_IFELSE([AC_LANG_PROGRAM([[ #include <features.h> #if !defined __GLIBC__ error #elif __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 11) error #endif -__asm__(".type foo, %gnu_indirect_function"); -], [gold_cv_lib_glibc2_11=yes], [gold_cv_lib_glibc2_11=no])]) +void func (void) { } +void invoke (void); +__asm__(".type invoke, %gnu_indirect_function"); +typedef void (*funcptr) (void); +funcptr dispatch (void) __asm__ ("invoke"); +funcptr dispatch (void) { return &func; }]], +[[invoke();]]) +], [ +if ${NM} conftest$EXEEXT | grep "__rela\?_iplt_start" >/dev/null 2>&1; then + gold_cv_lib_glibc_ifunc=both +else + gold_cv_lib_glibc_ifunc=dyn +fi], [gold_cv_lib_glibc_ifunc=no]) +LDFLAGS="$save_LDFLAGS"]) -AM_CONDITIONAL(IFUNC, test "$gold_cv_lib_glibc2_11" = "yes") +AM_CONDITIONAL(IFUNC, test "$gold_cv_lib_glibc_ifunc" != "no") +AM_CONDITIONAL(IFUNC_STATIC, test "$gold_cv_lib_glibc_ifunc" = "both") AM_BINUTILS_WARNINGS |
