llvm-project/clang/test/SemaObjC/suspicious-pragma-pack.m

// RUN: %clang_cc1 -Wpragma-pack-suspicious-include -triple i686-apple-darwin9 -fsyntax-only -I%S/Inputs -verify %s

#pragma pack (push, 1) // expected-note {{previous '#pragma pack' directive that modifies alignment is here}}
#import "empty.h" // expected-warning {{non-default #pragma pack value changes the alignment of struct or union members in the included file}}

#pragma pack (pop)
Recommit r308327 3rd time: Add a warning for missing '#pragma pack (pop)' and suspicious uses of '#pragma pack' in included files The second recommit (r309106) was reverted because the "non-default #pragma pack value chages the alignment of struct or union members in the included file" warning proved to be too aggressive for external projects like Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=749197). This recommit makes the problematic warning a non-default one, and gives it the -Wpragma-pack-suspicious-include warning option. The first recommit (r308441) caused a "non-default #pragma pack value might change the alignment of struct or union members in the included file" warning in LLVM itself. This recommit tweaks the added warning to avoid warnings for #includes that don't have any records that are affected by the non-default alignment. This tweak avoids the previously emitted warning in LLVM. Original message: This commit adds a new -Wpragma-pack warning. It warns in the following cases: - When a translation unit is missing terminating #pragma pack (pop) directives. - When entering an included file if the current alignment value as determined by '#pragma pack' directives is different from the default alignment value. - When leaving an included file that changed the state of the current alignment value. rdar://10184173 Differential Revision: https://reviews.llvm.org/D35484 llvm-svn: 309386 2017-07-28 22:41:21 +08:00			`// RUN: %clang_cc1 -Wpragma-pack-suspicious-include -triple i686-apple-darwin9 -fsyntax-only -I%S/Inputs -verify %s`

			`#pragma pack (push, 1) // expected-note {{previous '#pragma pack' directive that modifies alignment is here}}`
			`#import "empty.h" // expected-warning {{non-default #pragma pack value changes the alignment of struct or union members in the included file}}`

			`#pragma pack (pop)`