diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 18ed6b53db..8f9e7d0810 100644 --- a/configure.in +++ b/configure.in @@ -908,6 +908,16 @@ if test "$GCC" = yes; then if test "$rb_cv_gcc_atomic_builtins" = yes; then AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS) fi + + AC_CACHE_CHECK(for __builtin_unreachable, rb_cv_func___builtin_unreachable, + [AC_TRY_LINK([@%:@include <stdlib.h>], + [exit(0); __builtin_unreachable();], + [rb_cv_func___builtin_unreachable=yes], + [rb_cv_func___builtin_unreachable=no]) + ]) + if test "$rb_cv_func___builtin_unreachable" = yes; then + AC_DEFINE_UNQUOTED(UNREACHABLE, [__builtin_unreachable()]) + fi fi AC_CACHE_CHECK(for exported function attribute, rb_cv_func_exported, [ |