show linker output even if the linker succeeds #119286

jyn514 · 2023-12-24T23:44:23Z

show stderr by default
show stdout if --verbose is passed
remove both from RUSTC_LOG
hide the linker cli args unless --verbose is passed

fixes #83436. fixes #38206. fixes #109979. helps with #46998. cc https://rust-lang.zulipchat.com/#narrow/stream/233931-t-compiler.2Fmajor-changes/topic/uplift.20some.20-Zverbose.20calls.20and.20rename.20to.E2.80.A6.20compiler-team.23706/near/408986134

try-job: aarch64-apple

r? @bjorn3

rustbot · 2023-12-24T23:44:33Z

rustc_macros::diagnostics was changed

cc @davidtwco, @compiler-errors, @TaKO8Ki

jyn514 · 2023-12-24T23:53:38Z

hmm actually this is a slight expansion of scope but @bjorn3 how would you feel about not printing the giant list of linker arguments unless someone passes --verbose (#109979)

jyn514 · 2023-12-25T01:10:13Z

also i know we settled on not showing stdout by default but it's useful for debugging search paths - maybe we should show it after all? it seems silly to have to pass both -Wl,--verbose and --verbose. #46998 (comment)

compiler/rustc_codegen_ssa/src/back/link.rs

compiler/rustc_interface/src/tests.rs

compiler/rustc_session/src/options.rs

compiler/rustc_codegen_ssa/src/back/link.rs

bors · 2024-01-06T18:43:05Z

☔ The latest upstream changes (presumably #119662) made this pull request unmergeable. Please resolve the merge conflicts.

jyn514 · 2024-01-20T01:03:00Z

hmm. that test has the following comment:

rust/tests/incremental/commandline-args.rs

Lines 13 to 20 in e9a009f

    
           // Between revisions 1 and 2, we are changing the debuginfo-level, which should 
        
           // invalidate the cache. Between revisions 2 and 3, we are adding `--verbose` 
        
           // which should have no effect on the cache. Between revisions, we are adding 
        
           // `--remap-path-prefix` which should invalidate the cache: 
        
           //[rpass1] compile-flags: -C debuginfo=0 
        
           //[rpass2] compile-flags: -C debuginfo=2 
        
           //[rpass3] compile-flags: -C debuginfo=2 --verbose 
        
           //[rpass4] compile-flags: -C debuginfo=2 --verbose --remap-path-prefix=/home/bors/rust=src

i suppose those lines are all invalid now, it should be testing that the CGU is not reused? i'm not sure why it's testing --verbose specifically, maybe it's enough to test any untracked CLI arg. i'll change it to --diagnostic-width.

i'm realizing your comments are all about #119129. i feel slightly uncomfortable making unrelated changes in this PR ... how do you feel about splitting them into a separate PR so i can assign michaelwoerister?

bjorn3 · 2024-01-20T09:10:30Z

how do you feel about splitting them into a separate PR so i can assign michaelwoerister?

Sure

bjorn3 · 2024-01-20T20:42:54Z

hide the linker cli args unless --verbose is passed

I prefer not doing this. It is helpful whenever a linkage issue is opened to not have to ask to rerun with RUSTFLAGS="--verbose". If you revert this change r=me. If you still want to keep it, let me thing about it for a bit.

jyn514 · 2024-12-01T19:15:56Z

ok, the current problem is that rustc_codegen_gcc ignores RUSTFLAGS=-Alinker-messages, which results in this error:

 error: linker stderr: /usr/bin/ld: /checkout/obj/build/x86_64-unknown-linux-gnu/stage1-tools/cg_gcc/mini_core.mini_core.e55951eb20a0121d-cgu.0.rcgu.o: relocation in read-only section `.rodata.global.c'
       /usr/bin/ld: creating DT_TEXTREL in a shared object

@antoyo how do you prefer i fix this? i can either:

change y.sh test to respect RUSTFLAGS, which may have other effects on your test suite
change y.sh test to unconditionally pass -Alinker-warnings
try and figure out how to fix the linker warning. i would appreciate your help with this.

jyn514 · 2024-12-01T19:19:33Z

actually wait what, where is -D warnings coming from

i don't see that in the flags y.sh passes to rustc

antoyo · 2024-12-01T19:44:33Z

@jyn514: You can pass the flags through CG_RUSTFLAGS.

jyn514 · 2024-12-01T22:15:56Z

@rustbot ready

note that this is based off of #133633 so you may want to review that first.

bors · 2024-12-09T06:46:40Z

☔ The latest upstream changes (presumably #134052) made this pull request unmergeable. Please resolve the merge conflicts.

…jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? `@bjorn3`

…jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? ``@bjorn3``

…jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? ```@bjorn3```

…jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? ````@bjorn3````

don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? `@bjorn3` try-build: dist-x86_64-linux

…jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? `@bjorn3` try-build: dist-x86_64-linux

…jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? ``@bjorn3`` try-build: dist-x86_64-linux

don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? `@bjorn3` try-build: i686-mingw

…jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? `@bjorn3` try-build: i686-mingw

Rollup merge of rust-lang#133633 - jyn514:hide-linker-args, r=bjorn3,jyn514 don't show the full linker args unless `--verbose` is passed the linker arguments can be *very* long, especially for crates with many dependencies. often they are not useful. omit them unless the user specifically requests them. split out from rust-lang#119286. fixes rust-lang#109979. r? `@bjorn3` try-build: i686-mingw

this was slightly complicated because codegen_ssa doesn't have access to a tcx.

jyn514 · 2024-12-19T00:23:05Z

@bjorn3 this is ready for review :)

bjorn3

Apart from some concern about serialization of Span without serializing the corresponding source map, this LGTM.

bjorn3 · 2024-12-19T10:16:54Z

compiler/rustc_middle/src/lint.rs

@@ -173,7 +173,7 @@ impl TyCtxt<'_> {
 /// This struct represents a lint expectation and holds all required information
 /// to emit the `unfulfilled_lint_expectations` lint if it is unfulfilled after
 /// the `LateLintPass` has completed.
-#[derive(Clone, Debug, HashStable)]
+#[derive(Clone, Debug, Encodable, Decodable, HashStable)]
 pub struct LintExpectation {


CodegenResults::serialize_rlink doesn't serialize the source map. While it this is fully correct and shouldn't be changed, this means that when a LintExpectation inside CodegenResults gets deserialized in a new compiler session, the Span inside of it will be garbage and similarly for the Span in LintLevelSource. Would it be possible to avoid serializing the spans? Or if not, replace them with DUMMY_SP? I'm not sure how well the linting infrastructure handles garbage spans.

I'm not sure how well the linting infrastructure handles garbage spans.

Probably doesn't handle garbage spans. If the spans are empty or hi < lo, I think that triggers debug assertions.

The raw lo and hi values are preserved across the serialization roundtrip (so the lo <= hi invariant is preserved (empty spans are valid and rendered as a span from lo to lo + 1)), however they refer to non-existent parts of the source map.

Hm, if those become OOB, then I think they also trigger debug assertions (or actual assertions) if there's any lint that unwraps when trying to read a SourceMap snippet.

rustbot assigned bjorn3 Dec 24, 2023

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Unreadable error messages on linking failure #46998

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Track verbose and verbose_internals #120159

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rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Dec 1, 2024

ChrisDenton mentioned this pull request Dec 10, 2024

Cargo shouldn't set /WX (-Werror for MSVC linker) outside of CI rust-lang/cargo#13620

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jyn514 added 4 commits December 18, 2024 18:01

show linker warnings even if it returns 0

08a626b

make it possible to silence linker warnings with a crate-level attribute

604d7c7

this was slightly complicated because codegen_ssa doesn't have access to a tcx.

warn on unused linker_messages warning attributes

46ce1c3

ignore linker errors on all platforms

f89d8db

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show linker output even if the linker succeeds #119286

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show linker output even if the linker succeeds #119286

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