Fixes

m4/flags.m4

@@ -13,7 +13,7 @@ AC_DEFUN([RDC_PROG_CC_FLAGS_IFELSE],
   CFLAGS_save="${CFLAGS}"
   as_ac_var=`echo "ac_cv_prog_cc_flags_$1" | $as_tr_sh`
   AC_CACHE_CHECK([if $CC accepts $1], [$as_ac_var], [
-    CFLAGS="$1 ${CFLAGS_save}"
+    CFLAGS="${CFLAGS_save} $1"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
       eval "$as_ac_var=yes"
     ],[
@@ -21,11 +21,11 @@ AC_DEFUN([RDC_PROG_CC_FLAGS_IFELSE],
     ])
   ])
 
-  ac_res=`echo "${as_ac_var}"`
+  ac_res=`eval echo '${'$as_ac_var'}'`
   AS_IF([test "${ac_res}" != "no"], [
-    CFLAGS="$1 ${CFLAGS_save}"
-    CXXFLAGS="$1 ${CFLAGS_save}"
-    OBJCFLAGS="$1 ${OBJCFLAGS_save}"
+    CFLAGS="${CFLAGS_save} $1"
+    CXXFLAGS="${CFLAGS_save} $1"
+    OBJCFLAGS="${OBJCFLAGS_save} $1"
     $2
   ], [
     CFLAGS="${CFLAGS_save}"