b3e6ff3319
This commit introduces support for the MSVC-specific C++11-style attribute `[[msvc::constexpr]]`, which was introduced in MSVC 14.33. The semantics of this attribute are enabled only under MSVC compatibility (`-fms-compatibility-version`) 14.33 and higher. Additionally, the default value of `_MSC_VER` has been raised to 1433. The current implementation lacks support for: - `[[msvc::constexpr]]` constructors (see #72149); at the time of this implementation, such support would have required an unreasonable number of changes in Clang. - `[[msvc::constexpr]] return ::new` (constexpr placement new) from non-std namespaces (see #74924). Relevant to: #57696
29 lines
1.2 KiB
C++
29 lines
1.2 KiB
C++
// RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.33 -std=c++20 -ast-dump -verify %s | FileCheck %s
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// expected-no-diagnostics
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// CHECK: used f1 'bool ()'
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// CHECK: MSConstexprAttr 0x{{[0-9a-f]+}} <col:3, col:9>
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[[msvc::constexpr]] bool f1() { return true; }
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// CHECK: used constexpr f2 'bool ()'
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// CHECK-NEXT: CompoundStmt 0x{{[0-9a-f]+}} <col:21, col:56>
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// CHECK-NEXT: AttributedStmt 0x{{[0-9a-f]+}} <col:23, col:53>
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// CHECK-NEXT: MSConstexprAttr 0x{{[0-9a-f]+}} <col:25, col:31>
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// CHECK-NEXT: ReturnStmt 0x{{[0-9a-f]+}} <col:43, col:53>
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constexpr bool f2() { [[msvc::constexpr]] return f1(); }
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static_assert(f2());
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struct S1 {
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// CHECK: used vm 'bool ()' virtual
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// CHECK: MSConstexprAttr 0x{{[0-9a-f]+}} <col:7, col:13>
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[[msvc::constexpr]] virtual bool vm() { return true; }
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// CHECK: used constexpr cm 'bool ()'
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// CHECK-NEXT: CompoundStmt 0x{{[0-9a-f]+}} <col:25, col:60>
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// CHECK-NEXT: AttributedStmt 0x{{[0-9a-f]+}} <col:27, col:57>
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// CHECK-NEXT: MSConstexprAttr 0x{{[0-9a-f]+}} <col:29, col:35>
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// CHECK-NEXT: ReturnStmt 0x{{[0-9a-f]+}} <col:47, col:57>
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constexpr bool cm() { [[msvc::constexpr]] return vm(); }
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};
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static_assert(S1{}.cm());
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