Re: [Discuss-gnuradio] install issue with c++11

[Dave NotTelling]

Jason,

     You can set the CXXFLAGS env variable to "-std=c++11" and any CMake builds you run (assuming the same shell) will check the CXXFLAGS var first.  This assumes that you don't overwrite the value of CMAKE_CXX_FLAGS.  I just tried it in a terminal with `export CXXFLAGS="-std=c++11"`, then `cmake ..`, and finally `VERBOSE=1 make -j 1`.  The verbose make command will show you if your flags are taking or not.

-Dave

On Tue, Jun 5, 2018 at 8:00 AM Jason Matusiak <address@hidden> wrote:

I am trying to install gnuradio onto a Centos 7 box and am having more and more issues with packages that use c++11 commands.  For some of the packages, I add the line:

CMAKE_CXX_FLAGS "-std=c++11"

to the module's CMakeLists.txt file.

 

The issue is that that requires a fetch, the mod, and then a rebuild.  This worked OK with it was just gqrx I was doing it for, but now I need it for other modules it appears, and so I am trying to find a more elegant solution that covers everything that is built via a pybombs install gnuradio command (like gr-blocks, which I can't use this trick for).

 

If I understand the problem correctly, Ubuntu uses new enough tools to realize that it needs to use the c++11 version (or newer I assume) to build since it is needed.  It seems like even though Centos 7 has the c++11 capability, it does not smartly trying to use it, and must be directed to for the installs to work.

 

Is there something I can do at an upper level to make things happy on an install?

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