[WIP]: Remove libbacktrace #51408
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[WIP]: Remove libbacktrace #51408
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The job Click to expand the log.I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact |
joshtriplett
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Jun 7, 2018
src/libstd/build.rs
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| @@ -19,6 +19,7 @@ use std::fs::File; | |||
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| fn main() { | |||
| let target = env::var("TARGET").expect("TARGET was not set"); | |||
| /* | |||
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I assume the final version will actually delete code, rather than commenting it out?
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@est31 Could I get an acronym expansion on "RIIR"? "Re-Implementation In Rust"? |
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@joshtriplett Rewrite It In Rust. |
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| @@ -840,7 +840,13 @@ impl<'a> Builder<'a> { | |||
| // already-passed -C metadata flag with our own. Our rustc.rs | |||
| // wrapper around the actual rustc will detect -C metadata being | |||
| // passed and frob it with this extra string we're passing in. | |||
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So the wording above was correct where the compiler was the only crate graph depending on crates.io, but since now std itself also does that, we need to apply this metadata mangling to differ std's and rustc's symbols as well. Let me know if you want further explanation or you think that's enough to update the wording.
src/bootstrap/builder.rs
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| Mode::Std => "rustc-std", | ||
| Mode::Test => "rustc-test", | ||
| Mode::Codegen | Mode::Rustc => "rustc-rustc", | ||
| Mode::ToolStd | Mode::ToolTest | Mode::ToolRustc => "rustc-tools", |
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Let's stick an unreachable in this arm to be a little clearer (this is in an if statement where we've checked for tool already).
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| // If this was output in the `deps` dir then this is a precise file | ||
| // name (hash included) so we start tracking it. | ||
| if filename.starts_with(&target_deps_dir) { |
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Update this comment to state something along the lines of "We've already added this in the previous loop iteration"
| let filename = Path::new(&*filename); | ||
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| // If this was an output file in the "host dir" we don't actually | ||
| // worry about it, it's not relevant for us. |
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If the host dir contains a file that wasn't in the target dir, also promote it. This primarily is the case for things like proc macros, where if std depends on that, we'll need to make sure that the proc macro artifact is also promoted -- but since it's host only, it won't be in the target dir.
| } | ||
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| let filename = Path::new(&*filename); | ||
| let filename = Path::new(&**filename); | ||
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| // If this was an output file in the "host dir" we don't actually | ||
| // worry about it, it's not relevant for us. |
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Let's change this comment to basically refer to this same condition below and say see why there.
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The job Click to expand the log.I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact |
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Sooo.... below a mountain of rustbuild changes, and a bunch of patches to For a simple crate While this is the output of Rust nightly: I'm not sure how much of this is an addr2line problem, and how much of this is a problem of my usage of it. @philipc do you have any ideas? |
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The job Click to expand the log.I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact |
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It probably needs to take relocation into account, such as in the addr2line tests. And related to this, we need to handle debuginfo in shared libraries too, but that shouldn't be needed for what you are testing here. |
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I've chatted today again with @Mark-Simulacrum about the build system changes that this PR needs/does. They fixed some issues that this PR caused and sent me a patch which I included in this PR. They also found further issues. It turns out that the |
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If fixing derives is too hard then we could change the |
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☔ The latest upstream changes (presumably #50698) made this pull request unmergeable. Please resolve the merge conflicts. |
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The period of my contributions to Rust upstream has reached an end. Thus I'm unable to continue my work on this. I still think something like this is a great addition. I urge anyone interested in this change to adopt and continue it from here on. Thanks. |
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Remove libbacktrace in favour of the pure Rust library addr2line. See issue #46439.
Right now this PR is only a testbed as I'm trying to find out how to fix all the problems.
This PR currently bases on #51440 as it requires its changes. I want to enable review by different people of the two changes thus I've filed two PRs.
Blockers:
addr2linesuitability for std inclusion (integration into libstd gimli-rs/addr2line#89)findshlibssuitability for std inclusion (#![no_std] support gimli-rs/findshlibs#20)Very WIP. DO NOT MERGE