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build: only set V8_EMBEDDER_STRING where needed - #67147
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richardlau wants to merge 1 commit into
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richardlau wants to merge 1 commit into
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Passing `V8_EMBEDDER_STRING` on the command line to every compilation unit invalidates the ccache for those sources when `v8_embedder_string` is bumped in `common.gypi` meaning that almost all of `deps/v8` has to be rebuilt. Only set the macro where it is needed so that embedder string bumps have minimal affects on ccache reuse. Signed-off-by: Richard Lau <richard.lau@ibm.com>
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I'm concerned that this requires us maintaining the list of V8 sources that use Digging a bit, I think with ccache's default settings, changing a So I'd doubt if this is beneficial. |
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Fair enough. |
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Passing
V8_EMBEDDER_STRINGon the command line to every compilation unit invalidates the ccache for those sources whenv8_embedder_stringis bumped incommon.gypimeaning that almost all ofdeps/v8has to be rebuilt.Only set the macro where it is needed so that embedder string bumps have minimal affects on ccache reuse.
cc @nodejs/v8-update
Idea for this came from discussions with @sxa around build times in the CI. This is theoretical -- I have not verified this actually speeds up builds for V8 cherry-picks (when we bump the embedder string) as it would involve timing several builds (one build without/populating the ccache, bump v8_embedder_string and then rebuild) both with and without this PR.