Minimal cmake project with kconfig integration adapted from Zephyr.
Default build using a provided configurations called test.
mkdir build
cd build
cmake -GNinja -DBOARD=test ..
ninja
Note the above uses the config provided by:
configs/test_defconfig
Updating the configuration:
ninja menuconfig
This will bring up an interactive menu to turn options on/off and it will save a .config file in the build directory.
The test_defconfig can be updated by copying the build/.config file to configs/test_defconfig and committing.
Before any targets are built an autoconf.h header file is generated under:
build/kconfig/include/generate/autoconf.h
This is allows everything to have a common configuration.
if(CONFIG_TEST_OPTION)
message("Config test_option is enabled")
endif()
-include build/.config
ifeq ($(CONFIG_TEST_OPTION),y)
objs += src/test_option.o
endif
#include <autoconf.h>
#ifdef CONFIG_TEST_OPTION
// Code built for option.
#endif
Kconfig is Brilliant! It manages a unified configuration separately from the main source code that can be used with the build system and source code.
It is the best-in-class configuration management tool that exists for embedded C code, period.
It allows dependencies to be defined between different config options. And the best thing is, some really smart people have worked all this out before, so we get a really powerful system for little effort/cost.