1#
2# This function determins if the 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=$CXXFLAGS
9    CXXFLAGS=-pedantic
10    AC_RUN_IFELSE(
11      AC_LANG_PROGRAM(
12        [#include <math.h>],
13        [double x = HUGE_VAL; return x != x; ]),
14      [ac_cv_huge_val_sanity=yes],[ac_cv_huge_val_sanity=no],
15      [ac_cv_huge_val_sanity=yes])
16    CXXFLAGS=$ac_save_CXXFLAGS
17    AC_LANG_POP([C++])
18    ])
19  AC_SUBST(HUGE_VAL_SANITY,$ac_cv_huge_val_sanity)
20])
21