Add -Wswitch-enum. Document.

Fix PR c/5044.

From-SVN: r51386

1 files changed, 63 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/Wswitch-enum.c b/gcc/testsuite/gcc.dg/Wswitch-enum.c
new file mode 100644
index 0000000..00e4b55
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Wswitch-enum.c
@@ -0,0 +1,63 @@
+/* PR c/5044 */
+/* { dg-do compile } */
+/* { dg-options "-Wswitch-enum" } */
+
+enum e { e1, e2 };
+
+int
+foo (int i, int j, enum e ei, enum e ej, enum e ek, enum e el,
+     enum e em, enum e en, enum e eo, enum e ep)
+{
+  switch (i)
+    {
+    case 1: return 1;
+    case 2: return 2;
+    }
+  switch (j)
+    {
+    case 3: return 4;
+    case 4: return 3;
+    default: break;
+    }
+  switch (ei)
+    { /* { dg-warning "enumeration value `e1' not handled in switch" "enum e1" } */
+    } /* { dg-warning "enumeration value `e2' not handled in switch" "enum e2" { target *-*-* } 23 } */
+  switch (ej)
+    { /* { dg-warning "enumeration value `e1' not handled in switch" "enum e1" { target *-*-* } 28 } */
+    default: break;
+    } /* { dg-warning "enumeration value `e2' not handled in switch" "enum e2" } */
+  switch (ek)
+    {
+    case e1: return 1;
+    } /* { dg-warning "enumeration value `e2' not handled in switch" "enum e2" } */
+  switch (el)
+    {
+    case e1: return 1;
+    default: break;
+    }  /* { dg-warning "enumeration value `e2' not handled in switch" "enum e2" } */
+  switch (em)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    }
+  switch (en)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    default: break;
+    }
+  switch (eo)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    case 3: return 3;
+    } /* { dg-warning "case value `3' not in enumerated type `e'" "excess 3" } */
+  switch (ep)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    case 3: return 3;
+    default: break;
+    } /* { dg-warning "case value `3' not in enumerated type `e'" "excess 3" } */
+  return 0;
+}