diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 295894feee..c916cd5834 100644 --- a/configure.in +++ b/configure.in @@ -1534,6 +1534,18 @@ AS_CASE(["$target_os"], []) +AS_CASE(["$target_cpu-$target_os"], [[i[3-6]86-linux*]], [ + AC_CACHE_CHECK([for __sync_val_compare_and_swap], [rb_cv_gcc_compiler_cas], [ + AC_TRY_LINK([unsigned long atomic_var;], + [ + __sync_val_compare_and_swap(&atomic_var, 0, 1); + ], + [rb_cv_gcc_compiler_cas=yes], + [rb_cv_gcc_compiler_cas=no])]) + if test "$rb_cv_gcc_compiler_cas" = no; then + ARCH_FLAG="-march=i486" + fi]) + AC_CACHE_CHECK(for signbit, rb_cv_have_signbit, [AC_TRY_LINK([ #include <math.h> |