Use sccache to speed up builds about tc-build HOT 5 CLOSED

There are prebuilt binaries available.

[1] https://github.com/mozilla/sccache/releases/tag/v0.3.0

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Maybe, it helps us to speedup at least stage1-only builds where ccache is used.

It sounds like sccache is slower than ccache when used locally? mozilla/sccache#160

The main allure of sccache over ccache to me seems like Rust support and cloud storage support, both of which seem irrelevant for tc-build. Storing the cache in a cloud bucket but having the repo, build objects, and final toolchain be local doesn't make much sense to me.

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Thanks, Nathan.

Looks like using...

1. compression
2. direct-mode
   ...has an impact on performance.
   ccache with enabled compression and disabled direct-mode gives approx. same performance as sccache.

Add support for an equivalent to ccache direct mode #219
mozilla/sccache#219

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If this is not suitable for tc-build it might be helpful for the CBL CI?

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TuxSuite does use sccache in its backend, as TuxMake has support for it built in.

I don't think this makes sense for tc-build so I am closing this.

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