enums: Accept GNU extension

See testcase.  Happens e.g. in the linux kernel.

1 files changed, 43 insertions, 0 deletions

diff --git a/tests/tests2/17_enum.c b/tests/tests2/17_enum.c
index 0853c42..e2bc736 100644
--- a/tests/tests2/17_enum.c
+++ b/tests/tests2/17_enum.c
@@ -12,9 +12,49 @@ enum fred
    h
 };
 
+/* All following uses of enum efoo should compile
+   without warning.  While forward enums aren't ISO C,
+   it's accepted by GCC also in strict mode, and only warned
+   about with -pedantic.  This happens in the real world.  */
+/* Strict ISO C doesn't allow this kind of forward declaration of
+   enums, but GCC accepts it (and gives only pedantic warning), and
+   it occurs in the wild.  */
+enum efoo;
+struct Sforward_use {
+    int (*fmember) (enum efoo x);
+};
+
+extern enum efoo it_real_fn(void);
+enum efoo {
+  ONE,
+  TWO,
+};
+struct S2 {
+  enum efoo (*f2) (void);
+};
+void should_compile(struct S2 *s)
+{
+  s->f2 = it_real_fn;
+}
+
+enum efoo it_real_fn(void)
+{
+  return TWO;
+}
+
+static unsigned int deref_uintptr(unsigned int *p)
+{
+  return *p;
+}
+
+enum Epositive {
+    epos_one, epos_two
+};
+
 int main()
 {
    enum fred frod;
+   enum Epositive epos = epos_two;
 
    printf("%d %d %d %d %d %d %d %d\n", a, b, c, d, e, f, g, h);
    /* printf("%d\n", frod); */
@@ -23,6 +63,9 @@ int main()
    frod = e;
    printf("%d\n", frod);
 
+   /* Following should compile without warning.  */
+   printf ("enum to int: %u\n", deref_uintptr(&epos));
+
    return 0;
 }