feat(ci): enable sccache on Windows and propagate compiler launcher to ExternalProject
Windows CI builds were ~6-9x slower than other platforms (35-40 min vs
4-7 min) due to missing compiler cache. This commit enables sccache for
Windows and ensures all ExternalProject_Add dependencies (Arrow, lz4)
receive the compiler launcher on every platform.
Changes:
MSVC /Zi → /Z7 compatibility:
- Replace /Zi with /Z7 in root CMakeLists.txt for DEBUG and
RELWITHDEBINFO configurations (MSVC cache variable level)
- Patch rocksdb, antlr4, and googletest source CMakeLists to replace
hardcoded /Zi with /Z7 at the source, eliminating D9025 warnings
- Clear COMPILE_PDB_NAME on googletest targets to prevent CMake from
adding /Fd<path>, which causes sccache to look for nonexistent .pdb
- Remove /FS (forced synchronous PDB writes) from Arrow ExternalProject
MSVC flags — unnecessary with /Z7
Windows CI workflow:
- Add mozilla-actions/sccache-action@v0.0.10
- Set SCCACHE_GHA_ENABLED=true to use GitHub Actions Cache backend
- Pass CMAKE_C/CXX_COMPILER_LAUNCHER=sccache via --config-settings
Compiler launcher propagation:
- Propagate CMAKE_C/CXX_COMPILER_LAUNCHER to Arrow ExternalProject on
all platforms (Windows, Linux, macOS, Android, iOS)
- Propagate to lz4 ExternalProject on Windows via CMAKE_ARGS, using
CMP0141=NEW + CMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded for /Z7
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