Almost a year ago I added a script made by Helmut Grohne that is able to create a CMake toolchain file pre-filled with Debian-specifics ross compilers.
The tool is installed by the cmake package and located at /usr/share/cmake/debtoolchainfilegen.
It's usage is simple:
debtoolchainfilegen (arch) > cmake_toolchain_<arch>.cmake
Where $arch can be any of the Debian supported architectures, like arm64 (aka aarch64):
$ /usr/share/cmake/debtoolchainfilegen arm64 > /tmp/cmake_toolchain_aarch64 dpkg-architecture: warning: specified GNU system type aarch64-linux-gnu does not match CC system type x86_64-linux-gnu, try setting a correct CC environment variable dpkg-architecture: warning: specified GNU system type aarch64-linux-gnu does not match CC system type x86_64-linux-gnu, try setting a correct CC environment variable $ cat /tmp/cmake_toolchain_aarch64 # Use it while calling CMake: # mkdir build; cd build # cmake -DCMAKE_TOOLCHAIN_FILE="/path/to/cmake_toolchain_<arch>.cmake" ../ # set(CMAKE_SYSTEM_NAME "Linux") set(CMAKE_SYSTEM_PROCESSOR "aarch64") set(CMAKE_C_COMPILER "aarch64-linux-gnu-gcc") set(CMAKE_CXX_COMPILER "aarch64-linux-gnu-g++") set(PKG_CONFIG_EXECUTABLE "aarch64-linux-gnu-pkg-config") set(PKGCONFIG_EXECUTABLE "aarch64-linux-gnu-pkg-config") set(QMAKE_EXECUTABLE "aarch64-linux-gnu-qmake")
Note: I kept the warnings, which can be ignored and won't end up on the final file.
As you might have noticed the file itself has instructions on how to use it. Of course we will need the requires cross toolchain for the selected arch. For example using arm64:
$ apt install crossbuild-essential-arm64
That's it, we can now start cross building our cmake-based software.
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