Building Multiple Configurations

A project can build the same application repeatedly with different configurations, each into its own build directory, going beyond the single-configuration default of idf_project_default. To build several different applications from one source tree instead, see Building Multiple Binaries.

This is done with CMake presets. Each preset selects its own sdkconfig.defaults files and its own build directory, so the configurations are built side by side without affecting each other. The multi_config example defines a default (development) preset and two production presets:

CMakePresets.json
{
    "version": 3,
    "configurePresets": [
        {
            "name": "default",
            "binaryDir": "build/default",
            "cacheVariables": {
                "SDKCONFIG": "./build/default/sdkconfig"
            }
        },
        {
            "name": "prod1",
            "binaryDir": "build/prod1",
            "cacheVariables": {
                "SDKCONFIG_DEFAULTS": "sdkconfig.defaults.prod_common;sdkconfig.defaults.prod1",
                "SDKCONFIG": "./build/prod1/sdkconfig"
            }
        },
        {
            "name": "prod2",
            "binaryDir": "build/prod2",
            "cacheVariables": {
                "SDKCONFIG_DEFAULTS": "sdkconfig.defaults.prod_common;sdkconfig.defaults.prod2",
                "SDKCONFIG": "./build/prod2/sdkconfig"
            }
        }
    ]
}

So that the configurations do not interfere, the project keeps each sdkconfig in its build directory:

CMakeLists.txt
set(SDKCONFIG "${CMAKE_BINARY_DIR}/sdkconfig")
include($ENV{IDF_PATH}/tools/cmakev2/idf.cmake)
project(multi_config C CXX ASM)
idf_project_default()

Build a specific configuration by selecting its preset:

idf.py --preset prod1 build

Each preset builds into its own directory with its own configuration, from the same application sources.

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