Hi CMake experts,
I want to use CMake build system for large projects, which will uses different
toolchains.
Let’s take one simple example:
There are two project, one is using the arm cross toolchain, another one is
using the dsp toolchain.
cmake_projects/
├── CMakeLists.txt
├── arm_project
│ └── CMakeLists.txt
├── arm_project2
│ └── CMakeLists.txt
├── dsp_project
│ └── CMakeLists.txt
└── dsp_project2
└── CMakeLists.txt
Inside the cmake_projects/CMakeLists.txt:
add_subdirectory(arm_project)
add_subdirectory(arm_project2)
add_subdirectory(dsp_project)
add_subdirectory(dsp_project2)
Then, I want to build it:
mkdir build
cd build && cmake -DCMAKE_TOOLCHAIN_FILE=<which_toolchain> ../
You know that the CMAKE_TOOLCHAIN_FILE needs to be specified along with cmake
command line, so in above example what’s the <which_toolchain> should be ?
Yes, there might be another solution:
cmake_projects/
├── CMakeLists.txt
├── arm
│ └── CMakeLists.txt
├── dsp
│ └── CMakeLists.txt
├── arm_project
│ └── CMakeLists.txt
├── arm_project2
│ └── CMakeLists.txt
├── dsp_project
│ └── CMakeLists.txt
└── dsp_project2
└── CMakeLists.txt
so that inside arm/CMakeLists.txt
add_subdirectory(arm_project)
add_subdirectory(arm_project2)
and inside dsp/CMakeLists.txt
add_subdirectory(dsp_project)
add_subdirectory(dsp_project2)
Then, build it with
mkdir build_arm
cd build_arm && cmake -DCMAKE_TOOLCHAIN_FILE=<arm_toolchain_now> ../arm
mkdir build_dsp
cd build_dsp && cmake -DCMAKE_TOOLCHAIN_FILE=<dsp_toolchain_now> ../dsp
But this way I need to sperate the arm and dsp build folder structure, but
logically I need to keep the build folder structure as same as source code.
Or, let developer don’t be aware of the toolchain difference it’s just choosing
the right one…
But if it’s supporting specifying the CMAKE_TOOLCHAIN_FILE inside the
CMakeLists.txt, it might solving this problem.
Any suggestions or ideas ? Thanks in advanced.
Thanks,
Song
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