+ CFLAGS="${CFLAGS_save}"
+ AS_IF([test "${ac_res}" != "no"], [$2], [$3])
+])
+
+AC_DEFUN([RDC_PROG_CC_FLAGS],
+[AC_LANG_ASSERT(C)
+ RDC_PROG_CC_FLAGS_IFELSE([$1], [CFLAGS="${CFLAGS} $1"])
+])
+
+AC_DEFUN([RDC_PROG_CC_WFLAGS],
+[ for a in $1; do
+ RDC_PROG_CC_FLAGS([-W$a])
+ done
+])
+
+AC_DEFUN([RDC_PROG_CXX_FLAGS_IFELSE],
+[AC_LANG_ASSERT(C++)
+ CXXFLAGS_save="${CXXFLAGS}"
+ as_ac_var=`echo "ac_cv_prog_cxx_flags_$1" | $as_tr_sh`
+ AC_CACHE_CHECK([if $CXX accepts $1], [$as_ac_var], [