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Asked: 2026-06-06T00:35:55+00:00

IF(UNIX) # CROSS COMPILATION! ON/OFF #SET(CMAKE_C_COMPILER /home/username/projects/buildroot/output/host/usr/bin/arm-linux-gcc) #SET(CMAKE_CXX_COMPILER /home/username/projects/buildroot/output/host/usr/bin/arm-linux-g++) #SET(CMAKE_C_COMPILER /home/username/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-eabi-gcc) #SET(CMAKE_CXX_COMPILER /home/username/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-eabi-g++) here

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IF(UNIX)
    # CROSS COMPILATION! ON/OFF
    #SET(CMAKE_C_COMPILER   /home/username/projects/buildroot/output/host/usr/bin/arm-linux-gcc)
    #SET(CMAKE_CXX_COMPILER /home/username/projects/buildroot/output/host/usr/bin/arm-linux-g++)
    #SET(CMAKE_C_COMPILER   /home/username/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-eabi-gcc)
    #SET(CMAKE_CXX_COMPILER /home/username/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-eabi-g++)

here is what I do now for cross-compilation. I want to add option to run it alike that:

make CROSS_COMPILE=~/projects/buildroot/output/host/usr/bin/arm-linux-

and if I do not path CROSS_COMPILE to make (not to cmake) it must use system defaults so cmake must path this option to makefile. How can I make it?

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1 Answer

  1. Editorial Team

    Buildroot generates a CMake toolchain file for you. Depending on your Buildroot, it might be directly in the output directory, or in output/host/usr/share/buildroot. The file is named toolchainfile.cmake. Then to build your CMake applications, do:

    cmake -DCMAKE_TOOLCHAIN_FILE=/path/to/buildroot/output/host/usr/share/buildroot/toolchainfile.cmake

    This file contains all the definitions of the cross-compiler paths, pkg-config environment variables, headers and libraries location, etc.

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