# # This function determins if 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++]) ac_save_CXXFLAGS=$CXXFLAGS CXXFLAGS="$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]) CXXFLAGS=$ac_save_CXXFLAGS AC_LANG_POP([C++]) ]) AC_SUBST(HUGE_VAL_SANITY,$ac_cv_huge_val_sanity) ])