m4/add_cxxflags.m4

   1 dnl @synopsis XIPH_ADD_CXXFLAGS
   2 dnl
   3 dnl Add the given option to CXXFLAGS, if it doesn't break the compiler
   4
   5 AC_DEFUN([XIPH_ADD_CXXFLAGS],
   6 [AC_MSG_CHECKING([if $CXX accepts $1])
   7         AC_LANG_ASSERT([C++])
   8         ac_add_cxxflags__old_cxxflags="$CXXFLAGS"
   9         CXXFLAGS="$1"
  10         AC_TRY_LINK([
  11                         #include <cstdio>
  12                         ],
  13                 [puts("Hello, World!"); return 0;],
  14                 AC_MSG_RESULT([yes])
  15                         CXXFLAGS="$ac_add_cxxflags__old_cxxflags $1",
  16                 AC_MSG_RESULT([no])
  17                         CXXFLAGS="$ac_add_cxxflags__old_cxxflags"
  18                 )
  19 ])# XIPH_ADD_CXXFLAGS