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To see if your compiler has C++11 support, run it with just the --version option to get a print out of the version number. Do this for whichever compiler(s) you wish to use with Rosetta. Acceptable versions: GCC/g++: Version 4.8 or later.
I use AX_CXX_COMPILE_STDCXX_0X(can look on autoconf-archive) to check for c++11 capabilities of the compiler. It correctly determines that -std=c++0x required, but does not add it to CXXFLAGS. I took a look at the macro source and it actually checks but then restores previous flags.
What should I do to get CXXFLAGS set to be able to compile c++11 source?
Just adding -std=c++0x to AM_CXXFLAGS is not nice solution, because I'd like to put the burden of making the compiler compile in C++11 mode on the autoconf developers, not me.
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