Fix panic with build-std of a proc-macro. #9834
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Dylan-DPC-zz
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Aug 26, 2021
Update cargo 16 commits in e96bdb0c3d0a418e7fcd7fbd69be08abf830b4bc..9b81660b79832f92512edd4c29059a9ff88fcb6c 2021-08-17 22:58:47 +0000 to 2021-08-23 20:04:47 +0000 - Fix panic with build-std of a proc-macro. (rust-lang/cargo#9834) - Fix typos “a”→“an” (rust-lang/cargo#9821) - Fix typo in git-authentication.md (rust-lang/cargo#9832) - Add some debug logging for `cargo fix` (rust-lang/cargo#9831) - Add documentation about third-party registries. (rust-lang/cargo#9830) - unset the FIX_ENV when executing the real rustc (rust-lang/cargo#9818) - Allow crate download by checksum (rust-lang/cargo#9801) - Emit warning for migrating to unstable edition in stable channel (rust-lang/cargo#9792) - Warning for no lib dependencies (rust-lang/cargo#9771) - Temporarily disable extern-html-root-url test. (rust-lang/cargo#9824) - Move `tmp` test directory. (rust-lang/cargo#9814) - Fix test incorrectly validating CARGO_PKG_LICENSE_FILE. (rust-lang/cargo#9813) - Implement `[future-incompat-report]` config section (rust-lang/cargo#9774) - Bump curl. (rust-lang/cargo#9809) - Determine packages to install prior to installing (rust-lang/cargo#9793) - Show feature resolver differences for dev-dependencies. (rust-lang/cargo#9803)
Dylan-DPC-zz
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Aug 26, 2021
Update cargo 16 commits in e96bdb0c3d0a418e7fcd7fbd69be08abf830b4bc..9b81660b79832f92512edd4c29059a9ff88fcb6c 2021-08-17 22:58:47 +0000 to 2021-08-23 20:04:47 +0000 - Fix panic with build-std of a proc-macro. (rust-lang/cargo#9834) - Fix typos “a”→“an” (rust-lang/cargo#9821) - Fix typo in git-authentication.md (rust-lang/cargo#9832) - Add some debug logging for `cargo fix` (rust-lang/cargo#9831) - Add documentation about third-party registries. (rust-lang/cargo#9830) - unset the FIX_ENV when executing the real rustc (rust-lang/cargo#9818) - Allow crate download by checksum (rust-lang/cargo#9801) - Emit warning for migrating to unstable edition in stable channel (rust-lang/cargo#9792) - Warning for no lib dependencies (rust-lang/cargo#9771) - Temporarily disable extern-html-root-url test. (rust-lang/cargo#9824) - Move `tmp` test directory. (rust-lang/cargo#9814) - Fix test incorrectly validating CARGO_PKG_LICENSE_FILE. (rust-lang/cargo#9813) - Implement `[future-incompat-report]` config section (rust-lang/cargo#9774) - Bump curl. (rust-lang/cargo#9809) - Determine packages to install prior to installing (rust-lang/cargo#9793) - Show feature resolver differences for dev-dependencies. (rust-lang/cargo#9803)
bors
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Aug 27, 2021
Update cargo 19 commits in e96bdb0c3d0a418e7fcd7fbd69be08abf830b4bc..f559c109cc79fe413a8535fb620a5a58b3823d94 2021-08-17 22:58:47 +0000 to 2021-08-26 22:54:55 +0000 - Fix test not to rely on `cargo` in PATH. (rust-lang/cargo#9843) - Improve resolver message to include dependency requirements (rust-lang/cargo#9827) - Add hint for cargo metadata in environment section (rust-lang/cargo#9836) - Fix panic with build-std of a proc-macro. (rust-lang/cargo#9834) - Fix typos “a”→“an” (rust-lang/cargo#9821) - Fix typo in git-authentication.md (rust-lang/cargo#9832) - Add some debug logging for `cargo fix` (rust-lang/cargo#9831) - Add documentation about third-party registries. (rust-lang/cargo#9830) - unset the FIX_ENV when executing the real rustc (rust-lang/cargo#9818) - Allow crate download by checksum (rust-lang/cargo#9801) - Emit warning for migrating to unstable edition in stable channel (rust-lang/cargo#9792) - Warning for no lib dependencies (rust-lang/cargo#9771) - Temporarily disable extern-html-root-url test. (rust-lang/cargo#9824) - Move `tmp` test directory. (rust-lang/cargo#9814) - Fix test incorrectly validating CARGO_PKG_LICENSE_FILE. (rust-lang/cargo#9813) - Implement `[future-incompat-report]` config section (rust-lang/cargo#9774) - Bump curl. (rust-lang/cargo#9809) - Determine packages to install prior to installing (rust-lang/cargo#9793) - Show feature resolver differences for dev-dependencies. (rust-lang/cargo#9803)
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If you try to run
cargo build -Zbuild-stdin a proc-macro project, cargo would panic incheck_collisions. This is because it iterates over every Unit in the build graph checking theoutputsfor filenames. However,outputswas missing the outputs for standard library units. That is becauseoutputsis computed by walking the graph starting from the roots.The bug here is that
attach_std_depswas adding the standard library units to graph, even though they aren't reachable from the roots, thus creating orphans.The solution is to avoid adding the standard library units if they are not needed (as is the case when building just a proc-macro).
Fixes #9828