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[SR-656] swiftc -v doesn't show linker invocation #43273

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jckarter opened this issue Feb 2, 2016 · 6 comments
Closed

[SR-656] swiftc -v doesn't show linker invocation #43273

jckarter opened this issue Feb 2, 2016 · 6 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself good first issue Good for newcomers legacy driver Area → compiler: the integrated C++ legacy driver. Succeeded by the swift-driver project

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@jckarter
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jckarter commented Feb 2, 2016

Previous ID SR-656
Radar None
Original Reporter @jckarter
Type Bug
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, Driver, StarterBug
Assignee dabelknap (JIRA)
Priority Medium

md5: 7f56172830eafef8f435799f450b961b

Issue Description:

If you do swiftc -v, it doesn't pass the -v down to the clang invocation that calls the linker, making it hard to see the real linker invocation:

$ ./bin/swiftc -v ~/hello.swift 
Swift version 3.0-dev (LLVM 524cfeb800, Clang f66c5bb67b, Swift d52049d9a8)
Target: x86_64-unknown-linux-gnu
/home/jgroff/src/s/build/Ninja-DebugAssert/swift-linux-x86_64/bin/swift -frontend -c -primary-file /home/jgroff/hello.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -color-diagnostics -module-name hello -o /tmp/hello-12ab09.o
/home/jgroff/src/s/build/Ninja-DebugAssert/swift-linux-x86_64/bin/swift-autolink-extract /tmp/hello-12ab09.o -o /tmp/hello-6f89aa.autolink
clang++ /tmp/hello-12ab09.o -L /home/jgroff/src/s/build/Ninja-DebugAssert/swift-linux-x86_64/lib/swift/linux --target=x86_64-unknown-linux-gnu -Xlinker -rpath -Xlinker /home/jgroff/src/s/build/Ninja-DebugAssert/swift-linux-x86_64/lib/swift/linux -lswiftCore @/tmp/hello-6f89aa.autolink -Xlinker -T /home/jgroff/src/s/build/Ninja-DebugAssert/swift-linux-x86_64/lib/swift/linux/x86_64/swift.ld -o hello
<unknown>:0: error: link command failed with exit code 127 (use -v to see invocation)
@modocache
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Mannequin

modocache mannequin commented Aug 20, 2016

I think this can be done in Toolchains.cpp's constructInvocation(), by checking for context.Args.hasFlag(options::OPT_v) and appending -Xlinker -v to the invocation arguments if the flag is present. I'll try to send up a pull request later today.

@modocache
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Mannequin

modocache mannequin commented Aug 20, 2016

Hopefully this is what you had in mind: #4439

Let me know – thanks!

@jckarter
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Thanks! Like @belkadan noted, I was mostly interested in the ld invocation that clang dreamt up, not necessarily verbose spew from ld itself.

@modocache
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Mannequin

modocache mannequin commented Sep 6, 2016

I think this'd be interesting to implement, but I won't work on it anytime in the next few weeks. Hopefully someone else takes it! 🙂

@swift-ci
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swift-ci commented May 5, 2018

Comment by Austin Belknap (JIRA)

Only the `GenericUnix` implementation of `constructInvocation` would need to be modified, correct? It looks like the Darwin and Windows implementations call the linker directly, so those show up already when `-v` is passed to `swiftc`.

@swift-ci
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Comment by Austin Belknap (JIRA)

This is fixed in: #16458

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself good first issue Good for newcomers legacy driver Area → compiler: the integrated C++ legacy driver. Succeeded by the swift-driver project
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