reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/e56bf8a92708e92480f6dc2a8fcf773661b9e616
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Markus-Elfring/tools-Use-fputc-calls-in-some-functions/20260806-165154
        git checkout e56bf8a92708e92480f6dc2a8fcf773661b9e616

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 headers_install
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 -C tools/thermal/lib
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 -C tools/lib/api
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-14.2.0 ~/lkp-tests/kbuild/make.cross W=1 tools/all