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Fix #6805: add --enable-ccache configure option to prefix compiler invocations with `ccache` to attempt to reuse common results, e.g. for LLVM (re)builds. The information at developer [Note-ccache](../../wiki/Note-ccache) and at [ccache and clang concerns](http://petereisentraut.blogspot.fr/2011/09/ccache-and-clang-part-2.html) were what drove my introduction of the `-Qunused-arguments` and `CCACHE_CPP2` options. (Though I did confirm first-hand that at least the first really is necessary.) Yes, one certainly can re-route how `gcc` and `clang` are resolved in one's PATH and use that as a way to invoke `ccache`. But I personally do not want to introduce that change to my own PATH, and this seems like a small enough change that it does not hurt to add it, at least for now. (I don't know what form it would take when we move over to `rustpkg`.) |
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| clean.mk | ||
| ctags.mk | ||
| dist.mk | ||
| docs.mk | ||
| host.mk | ||
| install.mk | ||
| llvm.mk | ||
| perf.mk | ||
| platform.mk | ||
| pp.mk | ||
| rt.mk | ||
| rustllvm.mk | ||
| snap.mk | ||
| stage0.mk | ||
| target.mk | ||
| tests.mk | ||
| tools.mk | ||