diff options
Diffstat (limited to 'test/Sema/struct-packed-align.c')
| -rw-r--r-- | test/Sema/struct-packed-align.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/test/Sema/struct-packed-align.c b/test/Sema/struct-packed-align.c index 417c303..abdcd8e 100644 --- a/test/Sema/struct-packed-align.c +++ b/test/Sema/struct-packed-align.c @@ -1,5 +1,5 @@ // RUN: %clang_cc1 %s -fsyntax-only -verify -// expected-no-diagnostics +// RUN: %clang_cc1 %s -fsyntax-only -triple=x86_64-windows-coff -verify // Packed structs. struct s { @@ -138,3 +138,24 @@ extern int n2[__alignof(struct nS) == 8 ? 1 : -1]; extern int n1[sizeof(struct nS) == 9 ? 1 : -1]; extern int n2[__alignof(struct nS) == 1 ? 1 : -1]; #endif + +// Packed attribute shouldn't be ignored for bit-field of char types. +// Note from GCC reference manual: The 4.1, 4.2 and 4.3 series of GCC ignore +// the packed attribute on bit-fields of type char. This has been fixed in +// GCC 4.4 but the change can lead to differences in the structure layout. +// See the documentation of -Wpacked-bitfield-compat for more information. +struct packed_chars { + char a:4; + char b:8 __attribute__ ((packed)); + // expected-warning@-1 {{'packed' attribute was ignored on bit-fields with single-byte alignment in older versions of GCC and Clang}} + char c:4; +}; + +#if defined(_WIN32) && !defined(__declspec) // _MSC_VER is unavailable in cc1. +// On Windows clang uses MSVC compatible layout in this case. +extern int o1[sizeof(struct packed_chars) == 3 ? 1 : -1]; +extern int o2[__alignof(struct packed_chars) == 1 ? 1 : -1]; +#else +extern int o1[sizeof(struct packed_chars) == 2 ? 1 : -1]; +extern int o2[__alignof(struct packed_chars) == 1 ? 1 : -1]; +#endif |
