Date: Fri, 15 Dec 2017 18:58:21 +0000 (UTC) From: Dimitry Andric <dim@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r326880 - head/contrib/llvm/tools/clang/lib/Sema Message-ID: <201712151858.vBFIwLJ9032479@repo.freebsd.org>
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Author: dim Date: Fri Dec 15 18:58:21 2017 New Revision: 326880 URL: https://svnweb.freebsd.org/changeset/base/326880 Log: Pull in r320755 from upstream clang trunk (by me): Don't trigger -Wuser-defined-literals for system headers Summary: In D41064, I proposed adding `#pragma clang diagnostic ignored "-Wuser-defined-literals"` to some of libc++'s headers, since these warnings are now triggered by clang's new `-std=gnu++14` default: $ cat test.cpp #include <string> $ clang -std=c++14 -Wsystem-headers -Wall -Wextra -c test.cpp In file included from test.cpp:1: In file included from /usr/include/c++/v1/string:470: /usr/include/c++/v1/string_view:763:29: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string_view<char> operator "" sv(const char *__str, size_t __len) ^ /usr/include/c++/v1/string_view:769:32: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string_view<wchar_t> operator "" sv(const wchar_t *__str, size_t __len) ^ /usr/include/c++/v1/string_view:775:33: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string_view<char16_t> operator "" sv(const char16_t *__str, size_t __len) ^ /usr/include/c++/v1/string_view:781:33: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string_view<char32_t> operator "" sv(const char32_t *__str, size_t __len) ^ In file included from test.cpp:1: /usr/include/c++/v1/string:4012:24: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string<char> operator "" s( const char *__str, size_t __len ) ^ /usr/include/c++/v1/string:4018:27: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string<wchar_t> operator "" s( const wchar_t *__str, size_t __len ) ^ /usr/include/c++/v1/string:4024:28: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string<char16_t> operator "" s( const char16_t *__str, size_t __len ) ^ /usr/include/c++/v1/string:4030:28: warning: user-defined literal suffixes not starting with '_' are reserved [-Wuser-defined-literals] basic_string<char32_t> operator "" s( const char32_t *__str, size_t __len ) ^ 8 warnings generated. Both @aaron.ballman and @mclow.lists felt that adding this workaround to the libc++ headers was the wrong way, and it should be fixed in clang instead. Here is a proposal to do just that. I verified that this suppresses the warning, even when -Wsystem-headers is used, and that the warning is still emitted for a declaration outside of system headers. Reviewers: aaron.ballman, mclow.lists, rsmith Reviewed By: aaron.ballman Subscribers: mclow.lists, aaron.ballman, andrew, emaste, cfe-commits Differential Revision: https://reviews.llvm.org/D41080 This will allow to compile some of the libc++ headers in C++14 mode (which is the default for gcc 6 and higher, and will be the default for clang 6.0.0 and higher), with -Wsystem-headers and -Werror enabled. Reported by: andrew MFC after: 3 days Modified: head/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp Modified: head/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp ============================================================================== --- head/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp Fri Dec 15 18:56:12 2017 (r326879) +++ head/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp Fri Dec 15 18:58:21 2017 (r326880) @@ -12997,7 +12997,8 @@ bool Sema::CheckLiteralOperatorDeclaration(FunctionDec StringRef LiteralName = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); - if (LiteralName[0] != '_') { + if (LiteralName[0] != '_' && + !getSourceManager().isInSystemHeader(FnDecl->getLocation())) { // C++11 [usrlit.suffix]p1: // Literal suffix identifiers that do not start with an underscore // are reserved for future standardization.
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