7b3fe96992
This diagnostic (which defaults to an error, added in 95833f33bda6c92e746e0b0007b69c2c30bfc693) was intended to clearly point out cases where the C++ ABI won't match the Microsoft C++ ABI, for cases when this is enabled via a pragma over a region of code. The MSVC compatible struct layout feature can also be enabled via a compiler option (-mms-bitfields). If enabled that way, one essentially can't compile any C++ code unless also building with -Wno-incompatible-ms-struct (which GCC doesn't support, and projects developed with GCC aren't setting). For the MinGW target, it's expected that the C++ ABI won't match the MSVC one, if this option is used for getting the struct layout to match MSVC. Differential Revision: https://reviews.llvm.org/D81794
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -DTEST_FOR_WARNING -Wno-error=incompatible-ms-struct -verify -triple i686-apple-darwin9 -std=c++11 %s
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// RUN: %clang_cc1 -fsyntax-only -DTEST_FOR_WARNING -Wno-error=incompatible-ms-struct -verify -triple armv7-apple-darwin9 -std=c++11 %s
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// RUN: %clang_cc1 -fsyntax-only -DTEST_FOR_ERROR -verify -triple armv7-apple-darwin9 -std=c++11 %s
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// RUN: %clang_cc1 -fsyntax-only -DNO_PRAGMA -mms-bitfields -verify -triple armv7-apple-darwin9 -std=c++11 %s
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#ifndef NO_PRAGMA
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#pragma ms_struct on
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#endif
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struct A {
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unsigned long a:4;
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unsigned char b;
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};
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struct B : public A {
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#ifdef TEST_FOR_ERROR
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// expected-error@-2 {{ms_struct may not produce Microsoft-compatible layouts for classes with base classes or virtual functions}}
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#elif defined(TEST_FOR_WARNING)
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// expected-warning@-4 {{ms_struct may not produce Microsoft-compatible layouts for classes with base classes or virtual functions}}
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#endif
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unsigned long c:16;
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int d;
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B();
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};
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static_assert(__builtin_offsetof(B, d) == 12,
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"We can't allocate the bitfield into the padding under ms_struct");
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// rdar://16178895
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struct C {
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#ifdef TEST_FOR_ERROR
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// expected-error@-2 {{ms_struct may not produce Microsoft-compatible layouts for classes with base classes or virtual functions}}
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#elif defined(TEST_FOR_WARNING)
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// expected-warning@-4 {{ms_struct may not produce Microsoft-compatible layouts for classes with base classes or virtual functions}}
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#endif
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virtual void foo();
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long long n;
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};
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static_assert(__builtin_offsetof(C, n) == 8,
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"long long field in ms_struct should be 8-byte aligned");
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#if !defined(TEST_FOR_ERROR) && !defined(TEST_FOR_WARNING)
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// expected-no-diagnostics
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#endif
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