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feat: introduce esp-idf-configdep as a build optimization

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The esp-idf-configdep utility works as a compiler wrapper. It lets the
compiler compile the app and checks whether -MF option was used to
generate dependency files. If yes, it checks for sdkconfig.h dependency
in those files.

Target file depending on sdkconfig.h is then scanned for all CONFIG_*
occurrences and the dependency file is altered so that the given target
file is marked as "dirty" only if the config options it actually uses
are changed.

This ensures that after a configuration update, only affected files are
rebuilt, reducing incremental build times.

The compiler launcher mechanism is changed from RULE_LAUNCH_COMPILE
(Makefile-only) to CMAKE_*_COMPILER_LAUNCHER (generator-agnostic),
enabling launcher chaining (configdep -> ccache -> compiler).

Made-with: Cursor
This commit is contained in:
Jan Beran
2026-06-02 01:26:10 +08:00
committed by BOT
parent 2e2909506f
commit 9522af1d8f
10 changed files with 335 additions and 12 deletions
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tools/cmake/project.cmake
+37 -1
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@@ -608,16 +608,52 @@ macro(project project_name)
__target_set_toolchain()
# Build compiler launcher chain
set(compiler_launcher_chain "")
# Add custom wrapper if enabled (FIRST in chain)
if(CONFIGDEP_ENABLE)
# Check that esp-idf-kconfig >= CONFIGDEP_MIN_KCONFIG_VERSION is installed
# (required for cdep_tree / configdep support; version is defined in kconfig.cmake)
__check_python_package_min_version(${PYTHON} esp-idf-kconfig
"${CONFIGDEP_MIN_KCONFIG_VERSION}" _kconfig_version_ok)
if(_kconfig_version_ok)
find_program(CONFIGDEP_FOUND esp-idf-configdep)
if(CONFIGDEP_FOUND)
message(STATUS "esp-idf-configdep will be used for faster recompilation")
list(APPEND compiler_launcher_chain "esp-idf-configdep")
else()
message(WARNING "esp-idf-configdep enabled but not found. Re-run install and export scripts.")
endif()
else()
message(WARNING "esp-idf-configdep not supported by esp-idf-kconfig "
"(>= ${CONFIGDEP_MIN_KCONFIG_VERSION} required). Re-run install and export scripts.")
endif()
endif()
# Add ccache if enabled (SECOND in chain)
if(CCACHE_ENABLE)
find_program(CCACHE_FOUND ccache)
if(CCACHE_FOUND)
message(STATUS "ccache will be used for faster recompilation")
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
list(APPEND compiler_launcher_chain "ccache")
else()
message(WARNING "enabled ccache in build but ccache program not found")
endif()
endif()
# Apply the launcher chain - CMake automatically creates semicolon-separated list
if(compiler_launcher_chain)
set(CMAKE_C_COMPILER_LAUNCHER ${compiler_launcher_chain})
set(CMAKE_CXX_COMPILER_LAUNCHER ${compiler_launcher_chain})
set(CMAKE_ASM_COMPILER_LAUNCHER ${compiler_launcher_chain})
# Debug: show what the launcher chain looks like
string(REPLACE ";" " -> " launcher_display "${compiler_launcher_chain}")
message(STATUS "Compiler launcher chain: ${launcher_display}")
else()
message(STATUS "No compiler launcher chain will be used.")
endif()
# The actual call to project()
__project(${project_name} C CXX ASM)
__linux_build_set_lang_version()