1#
2# This function determins if the HUGE_VAL macro is compilable with the 
3# -pedantic switch or not. XCode < 2.4.1 doesn't get it right.
4#
5AC_DEFUN([AC_HUGE_VAL_CHECK],[
6  AC_CACHE_CHECK([for HUGE_VAL sanity], [ac_cv_huge_val_sanity],[
7    AC_LANG_PUSH([C++])
8    ac_save_CXXFLAGS=$CXXFLAGS
9    CXXFLAGS="$CXXFLAGS -pedantic"
10    AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]],
11                                   [[double x = HUGE_VAL; return x != x;]])],
12                  [ac_cv_huge_val_sanity=yes],[ac_cv_huge_val_sanity=no],
13                  [ac_cv_huge_val_sanity=yes])
14    CXXFLAGS=$ac_save_CXXFLAGS
15    AC_LANG_POP([C++])
16    ])
17  AC_SUBST(HUGE_VAL_SANITY,$ac_cv_huge_val_sanity)
18])
19