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[CI] Give the Windows leg a compiler cache

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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:
Lukas Brübach 2026-11-07 13:44:37 +01:00
parent 9cfb991af4
commit 1c7a4aeed0
2 changed files with 67 additions and 17 deletions
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22
CMakeLists.txt
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@ -53,11 +53,12 @@ else()
)
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
@ -71,10 +72,10 @@ 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)
@ -173,7 +174,10 @@ endif()
# Define proper compilation flags
if(MSVC)
# Disable Warning C4251, C++20 compatibility, Multi-threaded Builds, Warn Detection, Unwind Semantics, Debug Symbols
set(CMAKE_CXX_FLAGS "/wd4251 /Zc:__cplusplus /std:c++20 /permissive- /W4 /MP /EHsc /Zi")
# /Z7 rather than /Zi: it puts the debug information in each object file instead of a
# compiler-shared PDB, which is what ccache can cache (see the USE_CCACHE block above).
# The linker still merges it into the PDB that /DEBUG produces below.
set(CMAKE_CXX_FLAGS "/wd4251 /Zc:__cplusplus /std:c++20 /permissive- /W4 /MP /EHsc /Z7")
# Visual Studio: Maximum Optimization, Multi-threaded DLL
set(CMAKE_CXX_FLAGS_RELEASE "/Ox /MD")
# Visual Studio: No Optimization, Multi-threaded Debug DLL