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Rollup merge of #83433 - jyn514:cfg-bootstrap-macro, r=Mark-Simulacrum

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Pass --cfg=bootstrap for proc macros built by stage0

Cargo has a bug where it ignores RUSTFLAGS when building proc macro
crates (https://github.com/rust-lang/cargo/issues/4423).
However, sometimes rustc_macro needs to have conditional
compilation when there are breaking changes to the `libproc_macro` API
(see for example #83363). Previously, this wasn't possible, because the
crate couldn't tell the difference between stage 0 and stage 1.

Another alternative is to unconditionally build rustc_macros with the
master libstd instead of the beta one (i.e. use `--sysroot
stage0-sysroot`), but that led to strange and maddening errors:

```
error[E0460]: found possibly newer version of crate `std` which `synstructure` depends on
 --> compiler/rustc_macros/src/lib.rs:5:5
  |
5 | use synstructure::decl_derive;
  |     ^^^^^^^^^^^^
  |
  = note: perhaps that crate needs to be recompiled?
  = note: the following crate versions were found:
          crate `std`: /home/joshua/rustc2/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-b3602c301b71cc3d.rmeta
          crate `synstructure`: /home/joshua/rustc2/build/x86_64-unknown-linux-gnu/stage0-rustc/release/deps/libsynstructure-74ee66863479e972.rmeta
error[E0460]: found possibly newer version of crate `std` which `proc_macro2` depends on
  --> /home/joshua/.local/lib/cargo/registry/src/github.com-1ecc6299db9ec823/tracing-attributes-0.1.13/src/lib.rs:90:5
   |
90 | use proc_macro2::TokenStream;
   |     ^^^^^^^^^^^
   |
   = note: perhaps that crate needs to be recompiled?
   = note: the following crate versions were found:
           crate `std`: /home/joshua/rustc2/build/x86_64-unknown-linux-gnu/stage0-sysroot/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-b3602c301b71cc3d.rmeta
           crate `proc_macro2`: /home/joshua/rustc2/build/x86_64-unknown-linux-gnu/stage0-rustc/release/deps/libproc_macro2-a83c1f01610c129e.rlib
```

r? `@Mark-Simulacrum` cc `@jhpratt`
This commit is contained in:
Guillaume Gomez 2021-06-07 01:06:48 +02:00 committed by GitHub
commit 85fec06617
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7
src/bootstrap/bin/rustc.rs
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@ -124,6 +124,13 @@ fn main() {
cmd.arg("-C").arg("target-feature=-crt-static");
}
}
if stage == "0" {
// Cargo doesn't pass RUSTFLAGS to proc_macros:
// https://github.com/rust-lang/cargo/issues/4423
// Set `--cfg=bootstrap` explicitly instead.
cmd.arg("--cfg=bootstrap");
}
}
if let Ok(map) = env::var("RUSTC_DEBUGINFO_MAP") {