Include information about setup defaults in how-to-build guide #1694
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Currently, the how to build and run guide of the rustc dev guide doesn't mention anything about the default options you are given when running
./x.py setup
:This could lead to frustration for new users (like myself) who do not fully understand how the defaults affect the build process (see https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/Unable.20to.20compile.20rustc.20MSVC).
To resolve this, this PR makes a small modification can be made to the
Create a `config.toml`
section to: