diff options
Diffstat (limited to 'autoconf/m4/huge_val.m4')
| -rw-r--r-- | autoconf/m4/huge_val.m4 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/autoconf/m4/huge_val.m4 b/autoconf/m4/huge_val.m4 new file mode 100644 index 0000000000..fd94c11c86 --- /dev/null +++ b/autoconf/m4/huge_val.m4 @@ -0,0 +1,18 @@ +# +# This function determins if the the HUGE_VAL macro is compilable with the +# -pedantic switch or not. XCode < 2.4.1 doesn't get it right. +# +AC_DEFUN([AC_HUGE_VAL_CHECK],[ + AC_CACHE_CHECK([for HUGE_VAL sanity], [ac_cv_huge_val_sanity],[ + AC_LANG_PUSH([C++]) + CXXFLAGS=-pedantic + AC_RUN_IFELSE( + AC_LANG_PROGRAM( + [#include <math.h>], + [double x = HUGE_VAL; return x != x; ]), + [ac_cv_huge_val_sanity=yes],[ac_cv_huge_val_sanity=no], + [ac_cv_huge_val_sanity=yes]) + AC_LANG_POP([C++]) + ]) + AC_SUBST(HUGE_VAL_SANITY,$ac_cv_huge_val_sanity) +]) |