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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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cmake/modules/PrecompiledHeader.cmake
+7
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@@ -256,6 +256,13 @@ function(add_precompiled_header _target _input)
message(STATUS "Adding precompiled header ${_input} to target ${_target}.")
target_precompile_headers(${_target} PRIVATE ${_input})
# Clang records the modification time of every input in the precompiled
# header, which makes it differ between two checkouts of the same source
# and defeats a compiler cache. The build system already rebuilds the
# header when an input changes.
target_compile_options(${_target} PRIVATE
"$<$<CXX_COMPILER_ID:Clang,AppleClang>:SHELL:-Xclang -fno-pch-timestamp>")
get_target_property(_sources ${_target} SOURCES)
list(FILTER _sources INCLUDE REGEX ".*\\.mm?")