perf(ci): comprehensive ccache/sccache optimizations — all platforms#433
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Windows x64: - Remove sccache entirely (0% hit rate in all runs, caused C1041 PDB contention that /FS could not fix) - Remove mozilla-actions/sccache-action step - Remove SCCACHE_GHA_ENABLED env var - Keep CMP0141=NEW + CMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded (correct setup for sccache if ever re-enabled; also harmless without it) macOS + Linux (ccache): - Add include_file_mtime + include_file_ctime to CCACHE_SLOPPINESS: CI file timestamps change between runs causing unnecessary cache misses (documented in ccache manual as recommended for CI) - Add CCACHE_BASEDIR=GITHUB_WORKSPACE: converts absolute paths to relative ones before hashing, allowing cache sharing across different checkout paths Debian + Fedora (cd-packages.yml): same sloppiness + basedir additions Sources: ccache 4.10 manual (troubleshooting), sccache README (MSVC), sccache issue bambulab#2320 (C1041 is a known unresolved issue with sccache+MSVC)
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Properly researched fixes for all platforms based on official documentation.
Windows x64
Removes sccache entirely. Reasons:
/FSnor/Z7inCMAKE_FLAGScan fix reliably for all subprojectsKeeps
CMP0141=NEW + CMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded— correct setup per sccache docs should sccache ever be re-enabled.macOS + Linux (ccache)
Per ccache 4.10 manual:
include_file_mtime+include_file_ctimetoCCACHE_SLOPPINESS: CI file timestamps change between runs causing unnecessary cache missesCCACHE_BASEDIR=GITHUB_WORKSPACE: converts absolute paths to relative before hashing → cache hits even if checkout path changes