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[SR-5800] Ubuntu 14.04 with upgraded clang requires swiftdoc file to import a module #48370

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ankitspd opened this issue Aug 30, 2017 · 8 comments
Open

[SR-5800] Ubuntu 14.04 with upgraded clang requires swiftdoc file to import a module #48370

ankitspd opened this issue Aug 30, 2017 · 8 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself Linux Platform: Linux serialization Area → compiler: Serialization & deserialization

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@ankitspd
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Previous ID SR-5800
Radar rdar://problem/34188554
Original Reporter @aciidb0mb3r
Type Bug
Environment

swift-DEVELOPMENT-SNAPSHOT-2017-08-21-a-ubuntu14.04

Additional Detail from JIRA
Votes 1
Component/s Compiler
Labels Bug, Linux, Serialization
Assignee None
Priority Medium

md5: 741e76216c715a881c7f217db42ea78c

Issue Description:

Importing a module without its swiftdoc fails on Ubuntu 14.04 if clang is updated using apt-get. This doesn't happen on macOS or Ubuntu 16.04. This is what I did:

sudo apt-add-repository "deb http://llvm.org/apt/trusty/ llvm-toolchain-trusty-3.8 main"
sudo apt-get update
sudo apt-get install clang-3.8
sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-3.8 380
sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-3.8 380

This works on all platform:

touch hello.swift
echo "import hello" > main.swift
swiftc -module-name hello -emit-module -parse-as-library -c hello.swift
swiftc -I. main.swift

This fails on Ubuntu 14.04 with clang from apt-get but works on Ubuntu 16.04/macOS:

rm -rf hello.swiftdoc
swiftc -I. main.swift 
main.swift:1:8: error: no such module 'hello'
import hello
       ^

The Package Manager does not ship swiftdoc file for the PackageDescription module in the toolchain, should it start doing so? What about the existing toolchains?

https://lists.swift.org/pipermail/swift-users/Week-of-Mon-20170828/006111.html
@belkadan
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1. It shouldn't fail.
2. But you should be shipping the swiftdocs, because they have the doc comments.

@belkadan
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I can't see what this would have to do with the updated Clang, though.

@ankitspd
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I don't know why we never shipped doc file. @ddunbar is there a reason or should we just start doing that?

@ddunbar
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ddunbar commented Aug 30, 2017

No good reason, let's start. Still seems like it might be worth understanding why this fails.

@belkadan
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Yep, would like to keep the bug open. Need to get my hands on a 14.04 system, though.

@ankitspd
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I used this image on vmware: http://releases.ubuntu.com/14.04/ubuntu-14.04.5-server-amd64.iso
Let me know if I can provide any other information. This could be very annoying for Swift 4 users on release.

@ankitspd
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Filed https://bugs.swift.org/browse/SR-5802 for the package manager.

@belkadan
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@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself Linux Platform: Linux serialization Area → compiler: Serialization & deserialization
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@ddunbar @belkadan @ankitspd