"std::tr1 尚未声明"

Question

I'm trying nth time to compile qt from source, this time with option configure -release -platform-win32 but I'm getting errors:

Answer 1

You can run into this problem when compiling Qt with a MinGW compiler (maybe any gcc compiler) that defaults to compiling C++ programs with the C++11 standard enabled.

The 3rd party library JavaScriptCore tries to define some wrappers that 'normalize' has_trivial_constructor and related templates, but apparently it hasn't been been updated yet to deal with GCC's updates to incorporate the completed C++11 standard.

The fix is to use a MinGW compiler that doesn't enable C++11 features by default, or to turn them off by editing mkspecs\\win32-g++\\qmake.conf to add the -std=gnu++98 option to C++ builds:

QMAKE_CXXFLAGS = $$QMAKE_CFLAGS -std=gnu++98
#                               ^^^^^^^^^^^^

Answer 2

If you are using gcc 4.7 you have access to most of C++11 if you compile with -std=c++11 or -std=gnu++11 you can check out the supported features under std namespace here . tr1 sub namespace was for the draft which has been made standard now.

Answer 3

You can replace the preliminary std::tr1::has_trivial_constructor by the C++11 standardized std::is_trivially_constructible . See http://www.cplusplus.com/reference/type_traits/is_trivially_constructible .

Answer 4

尝试（在#include <type_traits>的宏中包装）在TypeTraits.h中添加#include <tr1/memory>

Answer 5

I was able to resolve this very issue just by putting