f55ce36c02
Summary: Per https://wg21.link/CWG1677, the C++11 standard did not clarify that constant initialization of an object allowed constexpr brace-or-equal initialization of subobjects: struct foo_t { union { int i; volatile int j; } u; }; __attribute__((__require_constant_initialization__)) static const foo_t x = {{0}}; Because foo_t::u has a volatile member, the initializer for x fails. However, there is really no good reason, because this: union foo_u { int i; volatile int j; }; __attribute__((__require_constant_initialization__)) static const foo_u x = {0}; does have a constant initializer. (This was triggered by musl's pthread_mutex_t type when building under C++11.) Reviewers: rsmith Subscribers: EricWF, cfe-commits Differential Revision: https://reviews.llvm.org/D28427 llvm-svn: 291480
22 lines
421 B
C++
22 lines
421 B
C++
// RUN: %clang_cc1 -verify %s -pedantic-errors -std=c++11
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// RUN: %clang_cc1 -verify %s -pedantic-errors -std=c++14
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// expected-no-diagnostics
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struct foo_t {
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union {
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int i;
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volatile int j;
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} u;
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};
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__attribute__((__require_constant_initialization__))
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static const foo_t x = {{0}};
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union foo_u {
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int i;
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volatile int j;
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};
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__attribute__((__require_constant_initialization__))
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static const foo_u y = {0};
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