[PATCH] Fix up -Wmaybe-uninitialized (PR middle-end/59223)

[Marek Polacek]

This fixes an oversight where we didn't run execute_late_warn_uninitialized
when only -Wmaybe-uninitialize was specified -- gate_warn_uninitialized
should take warn_maybe_uninitialized into account.

Regtested/bootstrapped on x86_64-linux, ok for trunk?

2014-02-26  Marek Polacek  <pola...@redhat.com>

        PR middle-end/59223
        * tree-ssa-uninit.c (gate_warn_uninitialized): Run the pass even for
        -Wmaybe-uninitialized.
testsuite/
        * c-c++-common/pr59223.c: New test.

diff --git gcc/testsuite/c-c++-common/pr59223.c 
gcc/testsuite/c-c++-common/pr59223.c
index e69de29..471c062 100644
--- gcc/testsuite/c-c++-common/pr59223.c
+++ gcc/testsuite/c-c++-common/pr59223.c
@@ -0,0 +1,13 @@
+/* PR c/59223 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wmaybe-uninitialized" } */
+
+int foo (int x)
+{
+  int y;
+  if (x == 0)
+    y = 1;
+  else if (x == 1)
+    y = 2;
+  return y; /* { dg-warning "may be used uninitialized in this function" } */
+}
diff --git gcc/tree-ssa-uninit.c gcc/tree-ssa-uninit.c
index d9b33b1..eee83f7 100644
--- gcc/tree-ssa-uninit.c
+++ gcc/tree-ssa-uninit.c
@@ -2355,7 +2355,7 @@ execute_late_warn_uninitialized (void)
 static bool
 gate_warn_uninitialized (void)
 {
-  return warn_uninitialized != 0;
+  return warn_uninitialized || warn_maybe_uninitialized;
 }
 
 namespace {

        Marek