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Allow ccache with PCH

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Clang records the modification time of every input in the precompiled
header, so a fresh checkout produces a different header and every file
that includes it misses the compiler cache. -fno-pch-timestamp makes the
header reproducible, and pch_defines lets ccache cache the header itself.
The precompiled header no longer has to be turned off when the cache is
on.
This commit is contained in:
Hanif Koh
2026-09-11 23:02:21 +08:00
parent 67f77e16c3
commit 6f90ff6e93
2 changed files with 11 additions and 6 deletions
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.github/workflows/build_orca.yml
+4 -6
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@@ -117,12 +117,10 @@ jobs:
run: |
echo "CMAKE_C_COMPILER_LAUNCHER=ccache" >> "$GITHUB_ENV"
echo "CMAKE_CXX_COMPILER_LAUNCHER=ccache" >> "$GITHUB_ENV"
# Headers a fresh checkout has just written, and the few files that
# use __DATE__ or __TIME__.
echo "CCACHE_SLOPPINESS=time_macros,include_file_mtime,include_file_ctime" >> "$GITHUB_ENV"
# Clang rebuilds the precompiled header with a fresh timestamp on
# every run, so everything that includes it would miss.
echo "ORCA_EXTRA_BUILD_ARGS=-DSLIC3R_PCH=OFF" >> "$GITHUB_ENV"
# Headers a fresh checkout has just written, the few files that
# use __DATE__ or __TIME__, and the precompiled header, whose
# macros ccache cannot see.
echo "CCACHE_SLOPPINESS=pch_defines,time_macros,include_file_mtime,include_file_ctime" >> "$GITHUB_ENV"
# The restored directory carries the previous run's counters.
ccache -z