[cfe-dev] Clang C++0x extensions

[Fletcher, John P]

Christopher

Both -std=gnu++0x and -std=c++0x give errors in the GNU headers for gcc 4.4 (the default version of gcc on my ubuntu system)

fletcher at fletcher-desktop:~/test$ gcc --version
gcc (Ubuntu 4.4.3-4ubuntu5) 4.4.3
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

These errors may relate to c++0x things not yet implemented in Clang, or it could be that I need a different set of g++ headers.  I cannot tell.  Some problems are in <iostream> and some caused by clang/Basic/Version (clang 2.9)

John


fletcher at fletcher-desktop:~/test$ make testcpp_cpp0x
/home/fletcher/LLVM/llvm/bin/clang++ -I/home/fletcher/LLVM/llvm/include -std=gnu++0x -DCLANG testcpp.cpp -otestcpp_cpp0x -L/home/fletcher/LLVM/llvm/lib -lclangBasic -lLLVMSupport -lpthread -ldl
In file included from testcpp.cpp:47:
In file included from /usr/include/c++/4.4/iostream:39:
In file included from /usr/include/c++/4.4/ostream:39:
In file included from /usr/include/c++/4.4/ios:39:
In file included from /usr/include/c++/4.4/exception:148:
/usr/include/c++/4.4/exception_ptr.h:143:13: error: unknown type name
      'type_info'
      const type_info*
            ^
In file included from testcpp.cpp:47:
In file included from /usr/include/c++/4.4/iostream:39:
In file included from /usr/include/c++/4.4/ostream:39:
In file included from /usr/include/c++/4.4/ios:40:
In file included from /usr/include/c++/4.4/bits/char_traits.h:40:
In file included from /usr/include/c++/4.4/bits/stl_algobase.h:66:
/usr/include/c++/4.4/bits/stl_pair.h:255:27: error: no matching function for
      call to 'forward'
        (std::forward<_T1>(__x), std::forward<_T2>(__y));
                                 ^~~~~~~~~~~~~~~~~
In file included from testcpp.cpp:49:
In file included from /home/fletcher/LLVM/llvm/include/clang/Basic/Version.h:18:
/home/fletcher/LLVM/llvm/include/llvm/ADT/StringRef.h:363:16: note: in
      instantiation of function template specialization 'std::make_pair<const
      llvm::StringRef &, llvm::StringRef>' requested here
        return std::make_pair(*this, StringRef());
               ^
In file included from testcpp.cpp:47:
In file included from /usr/include/c++/4.4/iostream:39:
In file included from /usr/include/c++/4.4/ostream:39:
In file included from /usr/include/c++/4.4/ios:40:
In file included from /usr/include/c++/4.4/bits/char_traits.h:40:
In file included from /usr/include/c++/4.4/bits/stl_algobase.h:66:
In file included from /usr/include/c++/4.4/bits/stl_pair.h:60:
/usr/include/c++/4.4/bits/move.h:51:5: note: candidate function [with _Tp =
      llvm::StringRef] not viable: no known conversion from 'llvm::StringRef' to
      'typename std::identity<StringRef>::type &&' (aka 'llvm::StringRef &&')
      for 1st argument
    forward(typename std::identity<_Tp>::type&& __t)
    ^
/usr/include/c++/4.4/bits/move.h:57:14: error: binding of reference to type
      'typename std::remove_reference<StringRef &>::type'
      (aka 'llvm::StringRef') to a value of type 'llvm::StringRef' drops
      qualifiers
    { return __t; }
             ^~~
In file included from testcpp.cpp:47:
In file included from /usr/include/c++/4.4/iostream:39:
In file included from /usr/include/c++/4.4/ostream:39:
In file included from /usr/include/c++/4.4/ios:40:
In file included from /usr/include/c++/4.4/bits/char_traits.h:40:
In file included from /usr/include/c++/4.4/bits/stl_algobase.h:66:
/usr/include/c++/4.4/bits/stl_pair.h:93:15: note: in instantiation of function
      template specialization 'std::move<llvm::StringRef &>' requested here
      : first(std::move(__p.first)),
              ^
In file included from testcpp.cpp:49:
In file included from /home/fletcher/LLVM/llvm/include/clang/Basic/Version.h:18:
/home/fletcher/LLVM/llvm/include/llvm/ADT/StringRef.h:363:16: note: in
      instantiation of member function 'std::pair<llvm::StringRef,
      llvm::StringRef>::pair' requested here
        return std::make_pair(*this, StringRef());
               ^
In file included from testcpp.cpp:47:
In file included from /usr/include/c++/4.4/iostream:39:
In file included from /usr/include/c++/4.4/ostream:39:
In file included from /usr/include/c++/4.4/ios:40:
In file included from /usr/include/c++/4.4/bits/char_traits.h:40:
In file included from /usr/include/c++/4.4/bits/stl_algobase.h:66:
/usr/include/c++/4.4/bits/stl_pair.h:255:3: error: no matching function for call
      to 'forward'
        (std::forward<_T1>(__x), std::forward<_T2>(__y));
         ^~~~~~~~~~~~~~~~~
In file included from testcpp.cpp:49:
In file included from /home/fletcher/LLVM/llvm/include/clang/Basic/Version.h:18:
/home/fletcher/LLVM/llvm/include/llvm/ADT/StringRef.h:364:14: note: in
      instantiation of function template specialization
      'std::make_pair<llvm::StringRef, llvm::StringRef>' requested here
      return std::make_pair(slice(0, Idx), slice(Idx+1, npos));
             ^
In file included from testcpp.cpp:47:
In file included from /usr/include/c++/4.4/iostream:39:
In file included from /usr/include/c++/4.4/ostream:39:
In file included from /usr/include/c++/4.4/ios:40:
In file included from /usr/include/c++/4.4/bits/char_traits.h:40:
In file included from /usr/include/c++/4.4/bits/stl_algobase.h:66:
In file included from /usr/include/c++/4.4/bits/stl_pair.h:60:
/usr/include/c++/4.4/bits/move.h:51:5: note: candidate function [with _Tp =
      llvm::StringRef] not viable: no known conversion from 'llvm::StringRef' to
      'typename std::identity<StringRef>::type &&' (aka 'llvm::StringRef &&')
      for 1st argument
    forward(typename std::identity<_Tp>::type&& __t)
    ^
4 errors generated.
make: *** [testcpp_cpp0x] Error 1

________________________________________
From: cfe-dev-bounces at cs.uiuc.edu [cfe-dev-bounces at cs.uiuc.edu] on behalf of Christopher Jefferson [chris at bubblescope.net]
Sent: 27 April 2011 08:49
To: Fletcher, John P
Cc: cfe-dev Developers
Subject: Re: [cfe-dev] Clang C++0x extensions

On 26 Apr 2011, at 17:59, Fletcher, John P wrote:

> Is there a specific command option to enable Clang C++0x extensions?  I have been looking through the manual and cannot find this.

You probably want -std=gnu++0x.

You can use -std=c++0x, but that disables gnu extensions. The default flag is  -std=gnu++03, and quite a bit of code (including last time I checked the standard header <cmath> on mac os x) won't compile in c++03 or c++0x mode.

Chris
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