Commits on Jun 19, 2024

1. Make -Cmetadata consistent across platforms …

   This commit updates how `-Cmetadata` is calculated for each unit to
   optionally exclude the `host: ...` line that rustc prints for
   cross-compiled builds. Previously the full `verbose_version` was hashed
   for stable builds and the `host` was explicitly hashed for non-stable
   builds. For a build using `--target`, however, that means that the
   `-Cmetadata` will be different when producing the same target on
   different hosts (e.g. producing the binary once on Linux and once on
   macOS).
   
   This can hinder reproduction of a binary across different platforms even
   when the `--target` flag is used. For example in rust-lang/rust#117597
   it was seen that a WebAssembly binary produced on different platforms
   was slightly different and this appears due to the differing
   `-Cmetadata` flags. After this commit the `-Cmetadata` flag is the same
   for two different platforms meaning that different platforms produce the
   same binary.
   
   I've tested locally and a simple project produces a different binary
   before this change but produces the same binary on two platforms after
   this change. Unfortunately automated testing of this change will be
   difficult since it requires two different host compilers, though.

   

   alexcrichton committed Jun 19, 2024
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