diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc
index 33114f13c8d..b7789b707e6 100644
--- a/gcc/c-family/c-opts.cc
+++ b/gcc/c-family/c-opts.cc
@@ -1296,8 +1296,8 @@ c_common_init (void)
 
   if (flag_preprocess_only)
     {
-      c_finish_options ();
       c_init_preprocess ();
+      c_finish_options ();
       preprocess_file (parse_in);
       return false;
     }
diff --git a/gcc/testsuite/g++.dg/pch/pr115312.C b/gcc/testsuite/g++.dg/pch/pr115312.C
new file mode 100644
index 00000000000..9074ad4a5ad
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pch/pr115312.C
@@ -0,0 +1,2 @@
+/* { dg-additional-options "-include pr115312.H -save-temps" } */
+#error "suppress PCH assembly comparison, which does not work with -save-temps" /* { dg-error "." } */
diff --git a/gcc/testsuite/g++.dg/pch/pr115312.Hs b/gcc/testsuite/g++.dg/pch/pr115312.Hs
new file mode 100644
index 00000000000..6e7c6bcac2f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pch/pr115312.Hs
@@ -0,0 +1 @@
+// This space intentionally left blank.