Add specific warning flags for GNU ext in Sema.

This patch adds the following, more specific warning flags:

gnu-anonymous-struct
gnu-compound-literal-initializer
gnu-empty-struct
gnu-flexible-array-initializer
gnu-flexible-array-union-member
gnu-folding-constant
redeclared-class-member
gnu-redeclared-enum
gnu-union-cast
gnu-variable-sized-type-not-at-end

Patch by Peter Lewis.

llvm-svn: 190972

1 files changed, 76 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/gnu-flags.cpp b/clang/test/SemaCXX/gnu-flags.cpp
new file mode 100644
index 00000000000..05770c53704
--- /dev/null
+++ b/clang/test/SemaCXX/gnu-flags.cpp
@@ -0,0 +1,76 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DNONE -Wno-gnu
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DALL -Wgnu 
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DALL -Wno-gnu \
+// RUN:   -Wgnu-anonymous-struct -Wredeclared-class-member \
+// RUN:   -Wgnu-flexible-array-union-member -Wgnu-folding-constant \
+// RUN:   -Wgnu-empty-struct
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DNONE -Wgnu \
+// RUN:   -Wno-gnu-anonymous-struct -Wno-redeclared-class-member \
+// RUN:   -Wno-gnu-flexible-array-union-member -Wno-gnu-folding-constant \
+// RUN:   -Wno-gnu-empty-struct
+// Additional disabled tests:
+// %clang_cc1 -fsyntax-only -verify %s -DANONYMOUSSTRUCT -Wno-gnu -Wgnu-anonymous-struct
+// %clang_cc1 -fsyntax-only -verify %s -DREDECLAREDCLASSMEMBER -Wno-gnu -Wredeclared-class-member
+// %clang_cc1 -fsyntax-only -verify %s -DFLEXIBLEARRAYUNIONMEMBER -Wno-gnu -Wgnu-flexible-array-union-member
+// %clang_cc1 -fsyntax-only -verify %s -DFOLDINGCONSTANT -Wno-gnu -Wgnu-folding-constant
+// %clang_cc1 -fsyntax-only -verify %s -DEMPTYSTRUCT -Wno-gnu -Wgnu-empty-struct
+
+#if NONE
+// expected-no-diagnostics
+#endif
+
+
+#if ALL || ANONYMOUSSTRUCT
+// expected-warning@+5 {{anonymous structs are a GNU extension}}
+#endif
+
+struct as {
+  int x;
+  struct {
+    int a;
+    float b;
+  };
+};
+
+
+#if ALL || REDECLAREDCLASSMEMBER
+// expected-note@+6 {{previous declaration is here}}
+// expected-warning@+6 {{class member cannot be redeclared}}
+#endif
+
+namespace rcm {
+  class A {
+    class X;
+    class X;
+    class X {};
+  };
+}
+
+
+#if ALL || FLEXIBLEARRAYUNIONMEMBER
+// expected-warning@+6 {{flexible array member 'c1' in a union is a GNU extension}}
+#endif
+
+struct faum {
+   int l;
+   union {
+       int c1[];
+   };
+};
+
+
+#if ALL || FOLDINGCONSTANT
+// expected-warning@+4 {{in-class initializer for static data member is not a constant expression; folding it to a constant is a GNU extension}}
+#endif
+
+struct fic {
+  static const int B = int(0.75 * 1000 * 1000);
+};
+
+
+#if ALL || EMPTYSTRUCT
+// expected-warning@+3 {{flexible array member 'a' in otherwise empty struct is a GNU extension}}
+#endif
+
+struct ofam {int a[];};
+