aminya / project_options

Add function to setup -DCMAKE_TOOLCHAIN_FILE/-DVCPKG_TOOLCHAIN_FILE and include() toolchain via -DOPT_TARGET_TRIPLET:STRING=x64-mingw-dynamic option.

Example:

project_options(
   TARGET_TRIPLET "x64-mingw-dynamic"
)

or with cmake arguments:

# for custom toolchains
cmake ... -DOPT_TOOLCHAIN_FILE:STRING="..." -DOPT_TARGET_TRIPLET:STRING="..."
## setup vcpkg and more

# use project_options toolchains
cmake ... -DOPT_TARGET_TRIPLET:STRING="..."
## setup vcpkg and more

# use vcpkg arguments
cmake ... -DVCPKG_CHAINLOAD_TOOLCHAIN_FILE="..." -DVCPKG_TARGET_TRIPLET="..."
## read vcpkg triplet and set OPT_TARGET_TRIPLET etc.

setup variables for cmake/vcpkg: VCPKG_HOST_TRIPLET, VCPKG_TRIPLET and DVCPKG_CHAINLOAD_TOOLCHAIN_FILE - https://github.com/microsoft/vcpkg/blob/master/docs/users/triplets.md
Possible Triplets for -DOPT_TARGET_TRIPLET:
- x64-mingw-dynamic, x64-mingw-static - for Windows builds
- x86-mingw-dynamic, x86-mingw-static - for Windows builds (32-Bit) (optional?)
- arm64-linux, arm-linux or arm64-windows, arm-windows - for ARM builds
- wasm32-emscripten - for WebASM/Emscripten (optional)
- more (optional)
setup cmake-toolchain
- cmake toolchain files included (batteries included)
- use pre-defined cmake toolchain files
  - examples from - https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html
  - https://github.com/staticlibs/cmake/tree/master/toolchains
  - write own toolchains - https://github.com/aminya/Toolchain, https://github.com/abeimler/simple-cppbuilder/tree/main/cmake
  - https://github.com/ruslo/polly (outdated)
  - https://github.com/onqtam/awesome-cmake#toolchains=
  - https://github.com/dockcross/dockcross
checks for ENV variables and paths, print some helpful messages if something is missing (optional)
- For example, when building for Android you need to set -DANDROID_NDK and -DANDROID_ABI
- Maybe add some (default) extra properties: like for example emscript, set_target_properties(${target} PROPERTIES LINK_FLAGS "-s ASSERTIONS=1 -s WASM=1 -s ASYNCIFY -s USE_PTHREADS=1 --bind")

Notes

Cross compiler must setup by user
Maybe addition arguments must be pass for cross-compiler root path or other paths like Android NDK, emscripten SDK (emsdk), ...

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I have taken the automated approach to the toolchains; the user should not need to specify the toolchains manually. We detect the proper toolchain based on the compiler settings and the target system.

For example, for the msvc toolchain:

project_options/src/VCEnvironment.cmake

Lines 58 to 64 in 370900d

    
           if(# if on windows and the generator is not Visual Studio 
        
              WIN32 
        
              AND NOT 
        
                  CMAKE_GENERATOR 
        
                  MATCHES 
        
                  "Visual Studio*") 
        
             is_msvc(_is_msvc)

We already detect MinGW and apply some fixes for it for VCPKG. You can use the same function to detect MinGW and include its toolchain.

project_options/src/MinGW.cmake

Line 4 in 370900d

function(is_mingw value)

	if(# if on windows and the generator is not Visual Studio
	WIN32
	AND NOT
	CMAKE_GENERATOR
	MATCHES
	"Visual Studio*")
	is_msvc(_is_msvc)

Add toolchain support

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