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Asked: 2026-06-03T07:01:39+00:00

I’m trying to compile a CMake project which uses set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} -Wall -std=gnu++0x) in

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I’m trying to compile a CMake project which uses 

set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-Wall -std=gnu++0x")

in the CMakeLists.txt file under MacOS X Lion. I have installed XCode 4.2.1. but the compiler fails with this:

cd something/src/lib && /usr/bin/c++   -Dlib_ginacra_EXPORTS -Wall -std=gnu++0x -fPIC   -o CMakeFiles/lib_ginacra.dir/utilities.cpp.o -c something/src/lib/utilities.cpp
cc1plus: error: unrecognized command line option "-std=gnu++0x"

The compiler’s verion is:

c++ --version
i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)
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1 Answer

  1. Editorial Team

    GCC 4.2 is ancient, but Apple don’t ship a newer version.

    You can either install a modern GCC from somewhere like Mac Ports (which is probably simpler and quicker) or build it yourself following the instructions at http://gcc.gnu.org/wiki/InstallingGCC

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