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[SR-82] Undefined reference errors when linking against Foundation on Linux #5335

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sharplet opened this issue Dec 6, 2015 · 4 comments
Closed

[SR-82] Undefined reference errors when linking against Foundation on Linux #5335

sharplet opened this issue Dec 6, 2015 · 4 comments
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@sharplet
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sharplet commented Dec 6, 2015

Previous ID SR-82
Radar None
Original Reporter @sharplet
Type Bug
Status Resolved
Resolution Cannot Reproduce
Environment 
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 15.10
Release:    15.10
Codename:   wily
Additional Detail from JIRA
Votes 0
Component/s Package Manager
Labels Bug
Assignee None
Priority Medium

md5: 2175b88b9bbb7d223d9d9c8498681739

Issue Description:

I'm trying to get an existing project building on Linux.

The project is a wrapper around NSRegularExpression. I'm aware that NSRegularExpression is currently unimplemented on Linux. So I expected the code to compile and link successfully, but to see a runtime error.

Instead, the library compiles fine, but fails when linking to an executable with a number of undefined reference errors:

$ swift build
Compiling Swift Module 'Regex' (3 sources)
Linking Library:  .build/debug/Regex.a
Compiling Swift Module 'testregex' (1 sources)
Linking Executable:  .build/debug/testregex
/home/sharplet/src/scratch/testregex/.build/debug/Regex.a(MatchResult.swift.o): In function `_TFC5RegexP33_39987651F4A52C01A04E0211B81F3A7A12_MatchResultD':
/home/sharplet/src/scratch/testregex/.build/debug/Regex.o/Source/MatchResult.swift.o:(.text+0x10c1): undefined reference to `_TMaC10Foundation20NSTextCheckingResult'
/home/sharplet/src/scratch/testregex/.build/debug/Regex.a(MatchResult.swift.o): In function `_TFFC5RegexP33_39987651F4A52C01A04E0211B81F3A7A12_MatchResultg13captureRangesGSaGVs5RangeVVSS9UTF16View5Index__U_FT_GSaGS1_S3___':
/home/sharplet/src/scratch/testregex/Packages/Regex-0.2.3/Source/MatchResult.swift:43: undefined reference to `_TMV10Foundation8_NSRange'
/home/sharplet/src/scratch/testregex/Packages/Regex-0.2.3/Source/MatchResult.swift:43: undefined reference to `_TMV10Foundation8_NSRange'
/home/sharplet/src/scratch/testregex/.build/debug/Regex.a(MatchResult.swift.o): In function `_TMaGSaV10Foundation8_NSRange_':
/home/sharplet/src/scratch/testregex/Packages/Regex-0.2.3/Source/MatchResult.swift:(.text+0x20b3): undefined reference to `_TMV10Foundation8_NSRange'
/home/sharplet/src/scratch/testregex/.build/debug/Regex.a(MatchResult.swift.o): In function `_TMaGVs17IndexingGeneratorGSaV10Foundation8_NSRange__':
/home/sharplet/src/scratch/testregex/Packages/Regex-0.2.3/Source/MatchResult.swift:(.text+0x2128): undefined reference to `_TMV10Foundation8_NSRange'
/home/sharplet/src/scratch/testregex/.build/debug/Regex.a(MatchResult.swift.o): In function `_TMaGVs10ArraySliceV10Foundation8_NSRange_':
/home/sharplet/src/scratch/testregex/Packages/Regex-0.2.3/Source/MatchResult.swift:(.text+0x21a3): undefined reference to `_TMV10Foundation8_NSRange'
/home/sharplet/src/scratch/testregex/.build/debug/Regex.a(MatchResult.swift.o):/home/sharplet/src/scratch/testregex/Packages/Regex-0.2.3/Source/MatchResult.swift:(.text+0x22c8): more undefined references to `_TMV10Foundation8_NSRange' follow
...

When I import Foundation in the REPL and try to use NSRegularExpression, I see the expected runtime error.

Steps to reproduce:

1. Create a new directory with the following `Package.swift` file:

import PackageDescription

let package = Package(
  name: "testregex",
  dependencies: [
    .Package(url: "https://github.com/sharplet/Regex.git", majorVersion: 0, minor: 2),
  ]
)

2. Run swift build
@onevcat
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onevcat commented Dec 17, 2015

It seems that you are using some `Foundation` things. Maybe it relates to [this](https://github.com/apple/swift-package-manager/blob/a63bc45fa73398953d651642bba31aa9211f9a08/Documentation/Package.swift.md#depending-on-apple-modules-eg-foundation)?

@aciidgh
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aciidgh commented Dec 19, 2015

it will work if you `import Foundation` in your executable

@mxcl
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mxcl commented Dec 24, 2015

Works for me with the Dec-22nd snapshot.

@mxcl
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mxcl commented Dec 24, 2015 

   git clone https://github.com/sharplet/Regex && cd Regex && swift build

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 4, 2022
This issue was closed.
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@mxcl @sharplet @onevcat @aciidgh