From aa96d81e4b1cd5bb8c2489a3e06aff32b9f833d7 Mon Sep 17 00:00:00 2001 From: BruebachL <44814898+BruebachL@users.noreply.github.com> Date: Sat, 5 Sep 2026 19:40:37 +0200 Subject: [PATCH] [Build] Enable ccache by default when it is installed (#7236) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * [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 --- CMakeLists.txt | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/CMakeLists.txt b/CMakeLists.txt index 7beb69409..0da073464 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -9,7 +9,7 @@ cmake_minimum_required(VERSION 3.16) # 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) option(WARNING_AS_ERROR "Treat warnings as errors in debug builds" ON) # Check for translation updates @@ -39,7 +39,11 @@ else() ) 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) if(CCACHE_PROGRAM) # Support Unix Makefiles and Ninja @@ -50,6 +54,9 @@ if(USE_CCACHE) execute_process(COMMAND ${CCACHE_PROGRAM} --set-config sloppiness=pch_defines,time_macros) message(STATUS "Found CCache ${CCACHE_PROGRAM}") 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() if(WIN32 OR USE_VCPKG)