add_cxxflags.m4

dnl @synopsis XIPH_ADD_CXXFLAGS
dnl
dnl Add the given option to CXXFLAGS, if it doesn't break the compiler

AC_DEFUN([XIPH_ADD_CXXFLAGS],
[AC_MSG_CHECKING([if $CXX accepts $1])
	AC_LANG_ASSERT([C++])
	ac_add_cxxflags__old_cxxflags="$CXXFLAGS"
	CXXFLAGS="$1"
	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
			#include <cstdio>
			]], [[puts("Hello, World!"); return 0;]])],[AC_MSG_RESULT(yes)
			CXXFLAGS="$ac_add_cxxflags__old_cxxflags $1"],[AC_MSG_RESULT(no)
			CXXFLAGS="$ac_add_cxxflags__old_cxxflags"
		])
])# XIPH_ADD_CXXFLAGS