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[CI] Give the Windows leg a compiler cache (#7797)

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ccache drives MSVC since 4.7, but it rejects /Zi and /ZI because the debug
information lives in a shared PDB it cannot restore. /Z7 puts it in the
object file instead, which is what makes the compilation cacheable and
also removes the shared PDB as a serialisation point on a 4-core runner.

Allow ccache on Windows in CMake, install it with Chocolatey, and persist
it under ccache-Windows10 the same way the Linux legs do.
This commit is contained in:
BruebachL 2026-11-07 20:58:28 +01:00 • committed by GitHub
parent 3931447729
commit ee66e73b2c
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2 changed files with 70 additions and 21 deletions
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22
CMakeLists.txt
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@ -48,11 +48,12 @@ if(NOT CMAKE_BUILD_TYPE)
)
endif()
# 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)
# ccache drives MSVC too (since 4.7), but only when the compiler writes debug
# information into the object file: /Zi and /ZI keep it in a shared PDB, and ccache
# reports them as unsupported rather than risk a stale one. The MSVC flags below
# therefore use /Z7. MSVC precompiled headers are cached as well, with the same
# sloppiness the other toolchains need.
if(USE_CCACHE)
find_program(CCACHE_PROGRAM ccache)
if(CCACHE_PROGRAM)
# Support Unix Makefiles and Ninja
@ -66,10 +67,10 @@ if(USE_CCACHE AND NOT WIN32)
# check for every project on the machine, not just this one.
execute_process(COMMAND ${CCACHE_PROGRAM} --set-config sloppiness=pch_defines,time_macros)
message(STATUS "Found CCache ${CCACHE_PROGRAM}")
else()
# An explicit opt-in must not disappear silently.
message(STATUS "ccache requested but not found; building without a compiler cache")
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)
@ -174,8 +175,9 @@ if(MSVC) # Microsoft Visual C++ compiler
# /utf-8 Set source file encoding and execution character set to UTF-8
# /W4 Enable warning level 4
# /Zc:__cplusplus Enable correct __cplusplus reporting
# /Zi Generate debugging information (Program Database, PDB)
set(CMAKE_CXX_FLAGS "/EHsc /MP /permissive- /utf-8 /W4 /Zc:__cplusplus /Zi")
# /Z7 Generate debugging information in each object file (ccache-cacheable)
# instead of a compiler-shared PDB, which ccache rejects
set(CMAKE_CXX_FLAGS "/EHsc /MP /permissive- /utf-8 /W4 /Zc:__cplusplus /Z7")
# /O2 Balanced optimization
# /MD Link against the multi-threaded DLL runtime library (Release CRT)
set(CMAKE_CXX_FLAGS_RELEASE "/O2 /MD")