svn commit: r326976 - in stable: 10/contrib/llvm/tools/clang/lib/Sema 11/contrib/llvm/tools/clang/lib/Sema 9/contrib/llvm/tools/clang/lib/Sema

[Dimitry Andric]

Author: dim
Date: Tue Dec 19 11:44:24 2017
New Revision: 326976
URL: https://svnweb.freebsd.org/changeset/base/326976

Log:
  MFC r326880:
  
  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

Modified:
  stable/11/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp
Directory Properties:
  stable/11/   (props changed)

Changes in other areas also in this revision:
Modified:
  stable/10/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp
  stable/9/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp
Directory Properties:
  stable/10/   (props changed)
  stable/9/   (props changed)
  stable/9/contrib/   (props changed)
  stable/9/contrib/llvm/   (props changed)
  stable/9/contrib/llvm/tools/clang/   (props changed)

Modified: stable/11/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp
==============================================================================
--- stable/11/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp	Tue Dec 19 11:39:05 2017	(r326975)
+++ stable/11/contrib/llvm/tools/clang/lib/Sema/SemaDeclCXX.cpp	Tue Dec 19 11:44:24 2017	(r326976)
@@ -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.