Bug 339803 – dev-util/kdevelop:4 failed to compile without -std=c++0x or -std=gnu++0x

• Status: RESOLVED WORKSFORME
• Product: Gentoo Linux

[Description Oleh Kravchenko 2010-10-05 10:06:27 UTC]

У файлі включеному з /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include/g++-v4/unordered_map:35,                                                                                                                                                 
                 з /var/tmp/portage/dev-util/kdevelop-4.0.2/work/kdevelop-4.0.2/languages/cpp/parser/parser.h:41,
                 з /var/tmp/portage/dev-util/kdevelop-4.0.2/work/kdevelop-4.0.2/languages/cpp/parser/parser.cpp:23:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include/g++-v4/c++0x_warning.h:31:2: error: #error This file requires compiler and library support for the upcoming ISO C++ standard, C++0x. This support is currently experimental, and must be enabled with the -std=c++0x or -std=gnu++0x compiler options.

Reproducible: Always

Steps to Reproduce:
1. emerge kdevelop

[Comment 1 Oleh Kravchenko 2010-10-05 10:08:40 UTC]

Created attachment 249623 [details]
emerge --info

[Comment 2 Michael Weber (RETIRED) 2010-10-06 08:46:28 UTC]

Hello,

can you please provide an full build.log? 

Thanks, Michael

[Comment 3 Oleh Kravchenko 2010-10-06 09:16:12 UTC]

Created attachment 249731 [details]
build.log

[Comment 4 Maciej Mrozowski 2010-10-06 23:43:08 UTC]

My build log (same gcc and same glibc):

-- Looking for include files HAVE_VALGRIND_H - found
-- Found shared-mime-info version: 0.71
-- Enabling c++0x support for unordered map

It seems kdevelop assumes every >=gcc-4.3 provides support for C++0x. Yours for some reason does not provide those features - do you happen to know why would it be the case?

#elif defined GXX_LT_4_3
#include <ext/hash_map>
using namespace __gnu_cxx;

#else // CXX-0
#include <unordered_map> <------ it bails here in your case
template <class Key, class Data>
class  hash_map : public std::unordered_map<Key, Data> { };
#endif

[Comment 5 Maciej Mrozowski 2010-10-06 23:53:39 UTC]

 macro_ensure_version("4.3.0" "${_gcc_version}" GCC_IS_NEWER_THAN_4_3)
  if (GCC_IS_NEWER_THAN_4_3)
    message(STATUS "Enabling c++0x support for unordered map")
    add_definitions( -std=c++0x ) # For unordered_map
  else(GCC_IS_NEWER_THAN_4_3)
    add_definitions( -DGXX_LT_4_3 )
  endif (GCC_IS_NEWER_THAN_4_3)
endif(CMAKE_COMPILER_IS_GNUCXX)

So GXX_LT_4_3 is passed correctly to preprocessor. I don't know why it doesn't work, anyway below there's full conditional block. It will use unordered map on any non-msvc compiler that is not '<=gcc-4.3'. I won't say it's perfectly safe condition but should work in your case nevertheless. 

#ifdef Q_CC_MSVC
#include <hash_map>
using namespace stdext;

#elif defined GXX_LT_4_3
#include <ext/hash_map>
using namespace __gnu_cxx;

#else // CXX-0
#include <unordered_map>
template <class Key, class Data>
class  hash_map : public std::unordered_map<Key, Data> { };
#endif

[Comment 6 Oleh Kravchenko 2010-11-14 20:52:02 UTC]

Work for me as like this bug http://bugs.gentoo.org/show_bug.cgi?id=339798