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Use time_macros over unset SOURCE_DATE_EPOCH in ccache 4.2 (unreleased)
ccache 4.2+ will ignore SOURCE_DATE_EPOCH [1]. [1]: https://github.com/ccache/ccache/pull/755
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@ -32,12 +32,21 @@ if (CCACHE_FOUND AND NOT COMPILER_MATCHES_CCACHE)
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if (CCACHE_VERSION VERSION_GREATER "3.2.0" OR NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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message(STATUS "Using ${CCACHE_FOUND} ${CCACHE_VERSION}")
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# 4+ ccache respect SOURCE_DATE_EPOCH (always includes it into the hash
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# of the manifest) and debian will extract these from d/changelog, and
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# makes cache of ccache unusable
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# debian (debhlpers) set SOURCE_DATE_EPOCH environment variable, that is
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# filled from the debian/changelog or current time.
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#
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# FIXME: once sloppiness will be introduced for this this can be removed.
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if (CCACHE_VERSION VERSION_GREATER "4.0")
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# - 4.0+ ccache always includes this environemtn variable into the hash
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# of the manifest, which do not allow to use previous cache,
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# - 4.2+ ccache ignores SOURCE_DATE_EPOCH under time_macros sloppiness.
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#
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# So for:
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# - 4.2+ time_macros sloppiness is used,
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# - 4.0+ will ignore SOURCE_DATE_EPOCH environment variable.
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if (CCACHE_VERSION VERSION_GREATER_EQUAL "4.2")
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message(STATUS "Use time_macros sloppiness for ccache")
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set_property (GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_FOUND} --set-config=sloppiness=time_macros")
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set_property (GLOBAL PROPERTY RULE_LAUNCH_LINK "${CCACHE_FOUND} --set-config=sloppiness=time_macros")
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elseif (CCACHE_VERSION VERSION_GREATER_EQUAL "4.0")
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message(STATUS "Ignore SOURCE_DATE_EPOCH for ccache")
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set_property (GLOBAL PROPERTY RULE_LAUNCH_COMPILE "env -u SOURCE_DATE_EPOCH ${CCACHE_FOUND}")
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set_property (GLOBAL PROPERTY RULE_LAUNCH_LINK "env -u SOURCE_DATE_EPOCH ${CCACHE_FOUND}")
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