Handle RUSTC_WRAPPER properly

[taiki-e]

No description provided.

[taiki-e]

$ tail -n +1  a.sh b.sh    
==> a.sh <==
#!/bin/bash
echo "$(basename "$0") called with arguments: $*"

==> b.sh <==
#!/bin/bash
echo "$(basename "$0") called with arguments: $*"

$ RUSTC="$(pwd)/a.sh" CARGO_BUILD_RUSTC="$(pwd)/b.sh" cargo build
error: `rustc -vV` didn't have a line for `host:`, got:
a.sh called with arguments: -vV

$ RUSTC_WRAPPER="$(pwd)/a.sh" CARGO_BUILD_RUSTC_WRAPPER="$(pwd)/b.sh" cargo build
error: malformed output when learning about crate-type rlib information
command was: `/Users/taiki/projects/cargo-llvm-cov/a.sh rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg`

--- stdout
a.sh called with arguments: rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg

$ RUSTC_WORKSPACE_WRAPPER="$(pwd)/a.sh" CARGO_BUILD_RUSTC_WORKSPACE_WRAPPER="$(pwd)/b.sh" cargo build
error: malformed output when learning about crate-type rlib information
command was: `/Users/taiki/projects/cargo-llvm-cov/a.sh rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg`

--- stdout
a.sh called with arguments: rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg

$ RUSTC_WRAPPER="$(pwd)/a.sh" RUSTC_WORKSPACE_WRAPPER="$(pwd)/b.sh" cargo build
error: malformed output when learning about crate-type rlib information
command was: `/Users/taiki/projects/cargo-llvm-cov/a.sh /Users/taiki/projects/cargo-llvm-cov/b.sh rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg`

--- stdout
a.sh called with arguments: /Users/taiki/projects/cargo-llvm-cov/b.sh rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg

$ CARGO_BUILD_RUSTC_WRAPPER="$(pwd)/a.sh" RUSTC_WORKSPACE_WRAPPER="$(pwd)/b.sh" cargo build
error: malformed output when learning about crate-type rlib information
command was: `/Users/taiki/projects/cargo-llvm-cov/a.sh /Users/taiki/projects/cargo-llvm-cov/b.sh rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg`

--- stdout
a.sh called with arguments: /Users/taiki/projects/cargo-llvm-cov/b.sh rustc - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg

RUSTC vs RUSTC_WRAPPER is more complex.
When rustc -vV fails:

$ tail -n +1  a.sh b.sh    
==> a.sh <==
#!/bin/bash
echo "$(basename "$0") called with arguments: $*"

==> b.sh <==
#!/bin/bash
echo "$(basename "$0") called with arguments: $*"

$ RUSTC="$(pwd)/a.sh" RUSTC_WRAPPER="$(pwd)/b.sh" cargo build
error: `rustc -vV` didn't have a line for `host:`, got:
a.sh called with arguments: -vV

But when if sucsees:

$ tail -n +1  a.sh b.sh    
==> a.sh <==
#!/bin/bash
echo "$(basename "$0") called with arguments: $*"
echo "rustc 1.63.0-nightly (12cd71f4d 2022-06-01)
binary: rustc
commit-hash: 12cd71f4d3ea6df9c2093781d55134cd9651d754
commit-date: 2022-06-01
host: x86_64-apple-darwin
release: 1.63.0-nightly
LLVM version: 14.0.4"

==> b.sh <==
#!/bin/bash
echo "$(basename "$0") called with arguments: $*"
echo "rustc 1.63.0-nightly (12cd71f4d 2022-06-01)
binary: rustc
commit-hash: 12cd71f4d3ea6df9c2093781d55134cd9651d754
commit-date: 2022-06-01
host: x86_64-apple-darwin
release: 1.63.0-nightly
LLVM version: 14.0.4"

$ RUSTC="$(pwd)/a.sh" RUSTC_WRAPPER="$(pwd)/b.sh" cargo build
error: output of --print=file-names has changed in the compiler, cannot parse
command was: `/Users/taiki/projects/cargo-llvm-cov/b.sh /Users/taiki/projects/cargo-llvm-cov/a.sh - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg`

--- stdout
b.sh called with arguments: /Users/taiki/projects/cargo-llvm-cov/a.sh - --crate-name ___ --print=file-names --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg
rustc 1.63.0-nightly (12cd71f4d 2022-06-01)
binary: rustc
commit-hash: 12cd71f4d3ea6df9c2093781d55134cd9651d754
commit-date: 2022-06-01
host: x86_64-apple-darwin
release: 1.63.0-nightly
LLVM version: 14.0.4

[taiki-e]

bors r+

[bors]

Build succeeded:

• ci