llvm-6502/autoconf/m4/huge_val.m4
Eric Christopher c771850380 Make sure we save CXXFLAGS before setting it as pedantic and regenerate
configure.

Fixes PR6388.

Patch by Yann Droneaud!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97548 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-02 05:06:54 +00:00

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#
# 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++])
ac_save_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)
])