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[SR-6082] Produce a better error message if Swift is run on a system without clang++ #48637

belkadan opened this issue Oct 6, 2017 · 1 comment


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@belkadan belkadan commented Oct 6, 2017

Previous ID SR-6082
Radar rdar://problem/23197056
Original Reporter @belkadan
Type Improvement
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement, Driver, Linux, StarterBug
Assignee None
Priority Medium

md5: 0ed0a272c70aa068a13e89f859372a45

relates to:

  • SR-834 Very unhelpful error message when clang++ cannot be invoked

Issue Description:

Swift on Linux (and other non-Apple platforms) calls clang++ to perform linking; if it's not found, we used to get this lousy error message:

<unknown>:0: error: link command failed with exit code 127 (use -v to see invocation)

We should do better. (It's possible we already do do better; I just don't have access to a Linux system without clang++ installed at the moment. If you have such a system, you can help out with this bug by downloading Swift from and seeing what echo 'print("hello")' | swiftc - produces.)

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@swift-ci swift-ci commented Nov 11, 2017

Comment by Alistair McMillan (JIRA)

On a brand new install of Ubuntu 16.04 running echo 'print("hello")' | swiftc - produces the following message...

/usr/lib/x86_64-linux-gnu/ version `GLIBCXX_3.4.22' not found (required by ./swiftc

So I updated libstdc++ using instructions from and now running echo 'print("hello")' | swiftc - produces...

<unknown>:0: error: link command failed with exit code 127 (use -v to see invocation)

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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