[cfe-dev] Clang C++0x extensions
Vassil Vassilev
vasil.georgiev.vasilev at cern.ch
Thu Apr 28 05:43:58 PDT 2011
Hi,
Interesting... I don't think it is only for 0x... I have the same
problem:
uname -a
Linux PCPHSFT79 2.6.32-31-generic #61-Ubuntu SMP Fri Apr 8 18:25:51 UTC
2011 x86_64 GNU/Linux
cat clang_fails.cxx
#include <string>
extern "C" int printf(const char* fmt, ...);
int main () {
std::string a = "a";
printf("%s\n", a.c_str());
return 0;
}
../Debug+Asserts/bin/clang clang_fails.cxx
In file included from clang_fails.cxx:1:
In file included from /usr/include/c++/4.4/string:41:
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:65:
/usr/include/c++/4.4/ext/numeric_traits.h:60:25: error: expected member
name or ';' after declaration specifiers
static const bool __is_signed = __glibcxx_signed(_Value);
~~~~~~~~~~~~~~~~~ ^
/usr/include/c++/4.4/ext/numeric_traits.h:71:50: error: expected
unqualified-id
const bool __numeric_traits_integer<_Value>::__is_signed;
^
/usr/include/c++/4.4/ext/numeric_traits.h:103:25: error: expected member
name or ';' after declaration specifiers
static const bool __is_signed = true;
~~~~~~~~~~~~~~~~~ ^
/usr/include/c++/4.4/ext/numeric_traits.h:112:51: error: expected
unqualified-id
const bool __numeric_traits_floating<_Value>::__is_signed;
^
In file included from clang_fails.cxx:1:
In file included from /usr/include/c++/4.4/string:41:
In file included from /usr/include/c++/4.4/bits/char_traits.h:40:
/usr/include/c++/4.4/bits/stl_algobase.h:925:49: error: expected
unqualified-id
&& !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
^
/usr/include/c++/4.4/bits/stl_algobase.h:930:45: error: non-type
template argument of type 'const bool' is not an integral constant
expression
return std::__lexicographical_compare<__simple>::__lc(__first1,
__last1,
^~~~~~~~
6 errors generated.
I don't think this is expected. Is it?
Vassil
On 04/28/2011 01:52 PM, Fletcher, John P wrote:
> 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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