Add Sema implementation of #pragma pack stack.

 - Follows the MSVC (original) implementation, including support of
   pack(show) (useful for testing).
 - Implements support for named pack records which gcc seems to
   ignore (or implements incorrectly).
 - Not currently wired to anything, only functionality change is the
   type checking of the pragma.

llvm-svn: 57476

1 files changed, 22 insertions, 0 deletions

diff --git a/clang/test/Sema/pragma-pack.c b/clang/test/Sema/pragma-pack.c
new file mode 100644
index 00000000000..2906e2b4225
--- /dev/null
+++ b/clang/test/Sema/pragma-pack.c
@@ -0,0 +1,22 @@
+// RUN: clang -m -triple i686-apple-darwin9 -fsyntax-only -verify %s
+
+/* expected-warning {{value of #pragma pack(show) == 8}} */ #pragma pack(show)
+/* expected-warning {{expected #pragma pack parameter to be}} */ #pragma pack(3)
+/* expected-warning {{value of #pragma pack(show) == 8}} */ #pragma pack(show)
+#pragma pack(4)
+/* expected-warning {{value of #pragma pack(show) == 4}} */ #pragma pack(show)
+#pragma pack() // resets to default
+/* expected-warning {{value of #pragma pack(show) == 8}} */ #pragma pack(show)
+#pragma pack(2)
+#pragma pack(push, eek, 16) // -> (eek, 2), 16
+/* expected-warning {{value of #pragma pack(show) == 16}} */ #pragma pack(show)
+#pragma pack(push) // -> (eek, 2), (, 2), 16
+/* expected-warning {{value of #pragma pack(show) == 16}} */ #pragma pack(show)
+#pragma pack(1) 
+#pragma pack(push, 8) // -> (eek, 2), (, 2), (, 1), 8
+/* expected-warning {{value of #pragma pack(show) == 8}} */ #pragma pack(show)
+#pragma pack(pop) // -> (eek, 2), (,2), 1
+/* expected-warning {{value of #pragma pack(show) == 1}} */ #pragma pack(show)
+#pragma pack(pop, eek)
+/* expected-warning {{value of #pragma pack(show) == 2}} */ #pragma pack(show)
+/* expected-warning {{#pragma pack(pop, ...) failed: stack empty}} */ #pragma pack(pop)