How to build x86 and or x64 on Windows from command line with CMAKE

Question

One way to get cmake to build x86 on Windows with Visual Studio is like so    Start Visual Studio Command prompt for x86 Run cmake  cmake -G  NMake Makefiles   path to source  nmake   One way to get cmake to build x64 on Windows with Visual Studio is like so    Start Visual Studio Command prompt for x64 Run cmake  cmake -G  NMake Makefiles   path to source  nmake   Using Cmake  how do I compile either or both architectures   like how Visual Studio does it from in the IDE

User · Answer

Besides CMAKE GENERATOR PLATFORM variable  there is also the -A switch  cmake -G  Visual Studio 16 2019  -A Win32 cmake -G  Visual Studio 16 2019  -A x64   https   cmake org cmake help v3 16 generator Visual 20Studio 2016 202019 html platform-selection    -A  lt platform-name gt              Specify platform name if supported by                                  generator

User · Answer

try use CMAKE GENERATOR PLATFORM   e g      x86 cmake -DCMAKE GENERATOR PLATFORM x86        x64 cmake -DCMAKE GENERATOR PLATFORM x64

User · Answer

This cannot be done with CMake  You have to generate two separate build folders  One for the x86 NMake build and one for the x64 NMake build  You cannot generate a single Visual Studio project covering both architectures with CMake  either  To build Visual Studio projects from the command line for both 32-bit and 64-bit without starting a Visual Studio command prompt  use the regular Visual Studio generators  For CMake 3 13 or newer  run the following commands  cmake -G  quot Visual Studio 16 2019 quot  -A Win32 -S  path to source  -B  quot build32 quot  cmake -G  quot Visual Studio 16 2019 quot  -A x64 -S  path to source  -B  quot build64 quot  cmake --build build32 --config Release cmake --build build64 --config Release  For earlier versions of CMake  run the following commands  mkdir build32  amp  pushd build32 cmake -G  quot Visual Studio 15 2017 quot   path to source  popd mkdir build64  amp  pushd build64 cmake -G  quot Visual Studio 15 2017 Win64 quot   path to source  popd cmake --build build32 --config Release cmake --build build64 --config Release  CMake generated projects that use one of the Visual Studio generators can be built from the command line with using the option --build followed by the build directory  The --config option specifies the build configuration

[c] How to build x86 and/or x64 on Windows from command line with CMAKE?

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