-[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_$1])dnl
-AC_CACHE_CHECK([whether compiler handles $1], [gl_Warn], [
- save_CFLAGS="$CFLAGS"
- CFLAGS="${CFLAGS} $1"
- AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
- [AS_VAR_SET([gl_Warn], [yes])],
- [AS_VAR_SET([gl_Warn], [no])])
- CFLAGS="$save_CFLAGS"
+dnl FIXME: gl_Warn must be used unquoted until we can assume
+dnl autoconf 2.64 or newer.
+[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
+AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
+AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
+ gl_save_compiler_FLAGS="$gl_Flags"
+ gl_Flags="$gl_Flags $1"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+ [AS_VAR_SET(gl_Warn, [yes])],
+ [AS_VAR_SET(gl_Warn, [no])])
+ gl_Flags="$gl_save_compiler_FLAGS"