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I would like to offer a way that always builds my target as a 32-bit or always as 64-bit executable executable with cmake independent of the host system (Adding the "-m32" or "-m64" flag for gcc, not sure yet what to do for other compilers).
I can think of three ways to do this, which one should I use?
In my case the forced 32-bit build will be the default and should be easy to use. A forced 64-bit build is the also useful for some cases and should not be too difficult. Using the bit width of the host system rarely makes sense for my case and I don't want to support it.
I found a related question here (The proper way of forcing a 32-bit compile using CMake) but the answers mostly discuss how it can be done at all, not how best to make it configurable.
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As far as I know, https://cmake.org/download/ does not offer 32-bit Linux binaries. You have two options: Build it yourself using the bootstrap script. All you need is a C and C++ compiler.
CMake needs a way to determine which compiler to use to invoke the linker. This is determined by the LANGUAGE property of source files of the target , and in the case of static libraries, the LANGUAGE of the dependent libraries.
Run the cmake executable or the cmake-gui to configure the project and then build it with your chosen build tool. Run the install step by using the install option of the cmake command (introduced in 3.15, older versions of CMake must use make install ) from the command line, or build the INSTALL target from an IDE.
For Visual Studio and per https://cmake.org/cmake/help/latest/variable/CMAKE_GENERATOR_PLATFORM.html
For Visual Studio Generators with VS 2005 and above this specifies the target architecture.
cmake . -DCMAKE_GENERATOR_PLATFORM=x64 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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