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Ehsan M.Kermani 2018-04-28 10:40:06 -07:00 committed by Who? Me?!
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@ -58,19 +58,19 @@ internally. The result is the compiling `rustc` is done in stages.
- **Stage 0:** the stage0 compiler can be your existing - **Stage 0:** the stage0 compiler can be your existing
(perhaps older version of) (perhaps older version of)
Rust compiler, the current _beta_ compiler or you may download the binary Rust compiler, the current _beta_ compiler or you may download the binary
from the internet from the internet.
- **Stage 1:** the code in your clone (for new version) - **Stage 1:** the code in your clone (for new version)
is then compiled with the stage0 is then compiled with the stage0
compiler to produce the stage1 compiler. compiler to produce the stage1 compiler.
However, it was built with an older compiler (stage0), However, it was built with an older compiler (stage0),
so to optimize the stage1 compiler we go to next stage so to optimize the stage1 compiler we go to next stage.
- **Stage 2:** we rebuild our stage1 compiler with itself - **Stage 2:** we rebuild our stage1 compiler with itself
to produce the stage2 compiler (i.e. it builds to produce the stage2 compiler (i.e. it builds
itself) to have all the _latest optimizations_ itself) to have all the _latest optimizations_.
- _(Optional)_ **Stage 3**: to sanity check of our new compiler, - _(Optional)_ **Stage 3**: to sanity check of our new compiler,
we can build it again we can build it again
with stage2 compiler which must be identical to itself, with stage2 compiler which must be identical to itself,
unless something has broken unless something has broken.
For hacking, often building the stage 1 compiler is enough, but for For hacking, often building the stage 1 compiler is enough, but for
final testing and release, the stage 2 compiler is used. final testing and release, the stage 2 compiler is used.