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cmake: leave the timestamp out of precompiled headers on clang (#28816)

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Clang stores the modification time of the precompiled header sources
inside the header and refuses the header when they differ. A cached
header restored from another checkout carries the timestamps of that
checkout, so the build fails. The option covers the compilers ccache
treats as MSVC while they are clang underneath, clang-cl and the Intel
LLVM drivers.
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Pascal 2026-09-12 22:47:14 +02:00 • committed by GitHub
parent 3057bb66c8
commit 737e0980fe
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10
CMakeLists.txt
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@ -197,6 +197,16 @@ llama_option_depr(WARNING LLAMA_CURL)
include("cmake/license.cmake")
license_add_file("llama.cpp" "LICENSE")
#
# compile options
#
# clang stores the modification time of the precompiled header sources inside the
# header and rejects it when they differ, so the timestamp is left out of it
add_compile_options(
"$<$<COMPILE_LANG_AND_ID:C,Clang,IntelLLVM>:SHELL:-Xclang -fno-pch-timestamp>"
"$<$<COMPILE_LANG_AND_ID:CXX,Clang,IntelLLVM>:SHELL:-Xclang -fno-pch-timestamp>")
#
# 3rd-party
#