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bootstrap: move all of rustc's flags to `rustc_cargo` This ensures that `RUSTFLAGS` will be consistent between all modes of building the compiler, so they won't trigger a rebuild by cargo. This kind of fix was started in #119414 just for LTO flags, but it's applicable to all kinds of flags that might be configured.
This directory contains some source code for the Rust project, including:
- The bootstrapping build system
- Various submodules for tools, like cargo, tidy, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.