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[Build] Enable ccache by default when it is installed (#7236)

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* [Build] Enable ccache by default when it is installed

ccache is a near free win for both clean and incremental rebuilds and
has no effect on systems where it is not installed (find_program
guards the whole block). Aligns the CMake default with the documented
behavior; users can still arch with -DUSE_CCACHE=OFF.

* [Build] Disable ccache auto-engage on Windows (MSVC)

* [Build] Report ccache skip on Windows explicitly

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
This commit is contained in:
BruebachL 2026-09-05 19:40:37 +02:00 • committed by GitHub
parent 14ecfff700
commit aa96d81e4b
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1 changed files with 9 additions and 2 deletions
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11
CMakeLists.txt
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@ -9,7 +9,7 @@
cmake_minimum_required(VERSION 3.16) cmake_minimum_required(VERSION 3.16)
# Use compiler cache (ccache) # Use compiler cache (ccache)
option(USE_CCACHE "Cache the build results with ccache" OFF) option(USE_CCACHE "Cache the build results with ccache" ON)
# Treat warnings as errors (Debug builds only) # Treat warnings as errors (Debug builds only)
option(WARNING_AS_ERROR "Treat warnings as errors in debug builds" ON) option(WARNING_AS_ERROR "Treat warnings as errors in debug builds" ON)
# Check for translation updates # Check for translation updates
@ -39,7 +39,11 @@ else()
) )
endif() endif()
if(USE_CCACHE) # ccache does not support MSVC and must not auto-engage on Windows
# (it is installed unintentionally on the Windows CI runner).
# NOTE: this keys off the target OS, so a mingw/Ninja configuration on Windows
# also opts out of ccache even though the GNUCXX branch below supports it.
if(USE_CCACHE AND NOT WIN32)
find_program(CCACHE_PROGRAM ccache) find_program(CCACHE_PROGRAM ccache)
if(CCACHE_PROGRAM) if(CCACHE_PROGRAM)
# Support Unix Makefiles and Ninja # Support Unix Makefiles and Ninja
@ -50,6 +54,9 @@ if(USE_CCACHE)
execute_process(COMMAND ${CCACHE_PROGRAM} --set-config sloppiness=pch_defines,time_macros) execute_process(COMMAND ${CCACHE_PROGRAM} --set-config sloppiness=pch_defines,time_macros)
message(STATUS "Found CCache ${CCACHE_PROGRAM}") message(STATUS "Found CCache ${CCACHE_PROGRAM}")
endif() endif()
elseif(USE_CCACHE AND WIN32)
# An explicit opt-in must not disappear silently on Windows.
message(STATUS "ccache disabled: not supported for the MSVC toolchain on Windows")
endif() endif()
if(WIN32 OR USE_VCPKG) if(WIN32 OR USE_VCPKG)