[CMake] 64bit linking on linux

[Bill Hoffman]

Birju Prajapati wrote:
> I’ve figured it out. I added the following lines into the root 
> CMakeLists.txt file:
> 
>  
> 
> SET(CMAKE_CXX_FLAGS "-m64")
> 
> SET(CMAKE_C_FLAGS "-m64")
> 
> SET(CMAKE_EXE_LINKER_FLAGS "-m64")
> 
> SET(CMAKE_MODULE_LINKER_FLAGS "-m64")
> 
> SET(CMAKE_SHARED_LINKER_FLAGS "-m64")
> 
>  

That is not the preferable way to do this.  As it hard codes flags into 
the CMake file.  The way I would do it is:

export CXXFLAGS=-m64
export CFLAGS=-m64
export LDFLAGS=-m64

cmake ../myproject

If those environment variables are set BEFORE you run cmake, then cmake 
will put them into the cache correctly.

-Bill