8a05c20c96
This just adds a warning for bitfields placed next to other bitfields where the underlying type has different storage. Under the MS struct bitfield packing ABI such bitfields are not packed.
33 lines
975 B
C
33 lines
975 B
C
// RUN: %clang_cc1 -mms-bitfields -fsyntax-only -verify -triple x86_64-apple-darwin9 %s
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// RUN: %clang_cc1 -mms-bitfields -fsyntax-only -Wms-bitfield-padding -verify=checkms -triple x86_64-apple-darwin9 %s
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// expected-no-diagnostics
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// The -mms-bitfields commandline parameter should behave the same
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// as the ms_struct attribute.
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struct
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{
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int a : 1; // #a
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short b : 1;
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// checkms-warning@-1 {{bit-field 'b' of type 'short' has a different storage size than the preceding bit-field (2 vs 4 bytes) and will not be packed under the Microsoft ABI}}
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// checkms-note@#a {{preceding bit-field 'a' declared here with type 'int'}}
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} t;
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// MS pads out bitfields between different types.
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static int arr[(sizeof(t) == 8) ? 1 : -1];
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#pragma pack (push,1)
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typedef unsigned int UINT32;
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struct Inner {
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UINT32 A : 1;
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UINT32 B : 1;
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UINT32 C : 1;
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UINT32 D : 30;
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} Inner;
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#pragma pack (pop)
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static int arr2[(sizeof(Inner) == 8) ? 1 : -1];
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