-Zprofile broken in nightly? #50203
Description
I am using -Zprofile to use gcov. However, the results are corrupted.
Here are my info.
$ cargo -V cargo 1.26.0-nightly (008c36908 2018-04-13) $ rustc -V rustc 1.27.0-nightly (ac3c2288f 2018-04-18) Reproduce the issue:
$ cargo new hello_world --bin $ cargo rustc --bins -- -Zprofile -Copt-level=1 -Clink-dead-code -Ccodegen-units=1 -Zno-landing-pads $ ./target/debug/hello_world ./target/debug/hello_world Hello, world! profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x66353136) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x37633437) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x66353136) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x63626564) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x00456238) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x38327472) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x00000000) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0xa3000000) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x246e6f69) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x36245447) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous GCDA file: corrupt arc tag (0x36626331) profiling: /hello_world/target/debug/deps/hello_world-b633c1f029999720.gcda: cannot merge previous run count: corrupt object tag (0x00004530) It works when using older version:
$ rustup override set nightly-2017-06-28 I don't know if this issue related with kennytm/cov#18
Also: ping #42524