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 # 5 AC_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
