swift test undefined reference error

Development Package Manager
1

I am attempting to use unit tests on a swift project in linux with
Swift DEVELOPMENT.SNAPSHOT.2016.05.09.a.

The executable is built in a module named WindFarmIRR with directory
structure:

Package.swift
Sources (D)
      main.swift
      irr.swift
      stringHelpers.swift
Tests (D)
      LinuxMain.swift
      WindFarmIRRTests (D)
             WindFarmIRRTests.swift

my test file, WindFarmIRRTests.swift, includes a line to import the
WindFarmIRR module: @testable import WindFarmIRR.

I am able to build the module successfully. When I run swift test,
however, the build fails with an 'undefined reference to' error. Sample
output is:

swift test
Compile Swift Module 'WindFarmIRRTestsTestSuite' (1 sources)
Linking .build/debug/WindFarmIRRTests.xctest
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug/WindFarmIRRTestsTestSuite.build/WindFarmIRRTests.swift.o:
In function
`_TFC25WindFarmIRRTestsTestSuite16WindFarmIRRTests26testCashFlowStructCashFlowfT_T_':
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Tests/WindFarmIRRTests/WindFarmIRRTests.swift:19:
undefined reference to `_TFV11WindFarmIRR8CashFlowCfT_S0_'
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug/WindFarmIRRTestsTestSuite.build/WindFarmIRRTests.swift.o:
In function
`_TFFC25WindFarmIRRTestsTestSuite16WindFarmIRRTests26testCashFlowStructCashFlowFT_T_u_KzT_GSqSd_':
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Tests/WindFarmIRRTests/WindFarmIRRTests.swift:26:
undefined reference to `_TFV11WindFarmIRR8CashFlow8cashFlowfT_Sd'
clang-3.8: error: linker command failed with exit code 1 (use -v to see
invocation)
<unknown>:0: error: link command failed with exit code 1 (use -v to see
invocation)
<unknown>:0: error: build had 1 command failures
error: exit(1): /usr/bin/swift-build-tool -f
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug.yaml
test

Text of LinuxMain.swift is:

···

------------------
import XCTest

@testable import WindFarmIRRTestsTestSuite

XCTMain([
    testCase(WindFarmIRRTests.allTests)
])
-------------------

Text of WindFarmIRRTests.swift is:
--------------------
#if os(Linux)
extension WindFarmIRRTests {
     static var allTests : [(String, (WindFarmIRRTests) -> () throws ->
Void)] {
        return [
            ("testCashFlowStructCashFlow", testCashFlowStructCashFlow)
        ]
    }
}
#endif

import XCTest
@testable import WindFarmIRR

class WindFarmIRRTests: XCTestCase {

    func testCashFlowStructCashFlow(){

        var cf = CashFlow()
        cf.electricitySaleIncome = 100
        cf.capitalCosts = 0
        cf.oAndMCosts = 0
        cf.transmissionCosts = 0

        XCTAssertEqual(cf.cashFlow(),100)

    }

}
---------------------------

The problem appears to be that the linker cannot find the executable module
to resolve the relevant symbols.

I would appreciate suggestions on what I am missing in the setup.

Thanks

2

Currently your Tests subdirectory needs to be named WindFarmIRR, which is not something we do a good job of diagnosing. I filed:
  [SR-1607] SwiftPM doesn't help diagnose mis-named test suites · Issue #5273 · apple/swift-package-manager · GitHub
to track fixing this.

- Daniel

···

On May 24, 2016, at 7:05 AM, G J via swift-build-dev <swift-build-dev@swift.org> wrote:

I am attempting to use unit tests on a swift project in linux with Swift DEVELOPMENT.SNAPSHOT.2016.05.09.a.

The executable is built in a module named WindFarmIRR with directory structure:

Package.swift
Sources (D)
      main.swift
      irr.swift
      stringHelpers.swift
Tests (D)
      LinuxMain.swift
      WindFarmIRRTests (D)
             WindFarmIRRTests.swift

my test file, WindFarmIRRTests.swift, includes a line to import the WindFarmIRR module: @testable import WindFarmIRR.

I am able to build the module successfully. When I run swift test, however, the build fails with an 'undefined reference to' error. Sample output is:

swift test
Compile Swift Module 'WindFarmIRRTestsTestSuite' (1 sources)
Linking .build/debug/WindFarmIRRTests.xctest
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug/WindFarmIRRTestsTestSuite.build/WindFarmIRRTests.swift.o: In function `_TFC25WindFarmIRRTestsTestSuite16WindFarmIRRTests26testCashFlowStructCashFlowfT_T_':
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Tests/WindFarmIRRTests/WindFarmIRRTests.swift:19: undefined reference to `_TFV11WindFarmIRR8CashFlowCfT_S0_'
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug/WindFarmIRRTestsTestSuite.build/WindFarmIRRTests.swift.o: In function `_TFFC25WindFarmIRRTestsTestSuite16WindFarmIRRTests26testCashFlowStructCashFlowFT_T_u_KzT_GSqSd_':
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Tests/WindFarmIRRTests/WindFarmIRRTests.swift:26: undefined reference to `_TFV11WindFarmIRR8CashFlow8cashFlowfT_Sd'
clang-3.8: error: linker command failed with exit code 1 (use -v to see invocation)
<unknown>:0: error: link command failed with exit code 1 (use -v to see invocation)
<unknown>:0: error: build had 1 command failures
error: exit(1): /usr/bin/swift-build-tool -f /home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug.yaml test

Text of LinuxMain.swift is:
------------------
import XCTest

@testable import WindFarmIRRTestsTestSuite

XCTMain([
    testCase(WindFarmIRRTests.allTests)
])
-------------------

Text of WindFarmIRRTests.swift is:
--------------------
if os(Linux)
extension WindFarmIRRTests {
     static var allTests : [(String, (WindFarmIRRTests) -> () throws -> Void)] {
        return [
            ("testCashFlowStructCashFlow", testCashFlowStructCashFlow)
        ]
    }
}
#endif

import XCTest
@testable import WindFarmIRR

class WindFarmIRRTests: XCTestCase {

    func testCashFlowStructCashFlow(){

        var cf = CashFlow()
        cf.electricitySaleIncome = 100
        cf.capitalCosts = 0
        cf.oAndMCosts = 0
        cf.transmissionCosts = 0

        XCTAssertEqual(cf.cashFlow(),100)
        
    }

}
---------------------------

The problem appears to be that the linker cannot find the executable module to resolve the relevant symbols.

I would appreciate suggestions on what I am missing in the setup.

Thanks

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swift-build-dev@swift.org
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3

Hi Daniel

I just found the bug report [SR-1503] on the new issue I reported
('multiple definition of main'). I'll follow the progress on that. But
otherwise the directory structure fix seems to have worked.

Thanks
Greg

···

On Tue, May 24, 2016 at 1:28 PM, G J <fishpesce@gmail.com> wrote:

Hi Daniel

Thanks for filing the bug. I fixed the directory structure per your
comments.

Package.swift (with module name WindFarmIRR)
Sources
Sources/main.swift
Sources/.....
Tests
Tests/LinuxMain.swift
Tests/WindFarmIRR
Tests/WIndFarmIRR/WindFarmIRRTests.swift

in LinuxMain I have "@testable import WindFarmIRRTestSuite"
in WindFarmIRRTests.swift I have "@testable import WindFarmIRR"

but now I get an error referring to multiple definitions of 'main':
---------
Linking .build/debug/WindFarmIRRTests.xctest
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug/WindFarmIRR.build/main.swift.o:
In function `main':
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Sources/main.swift:(.text+0x0):
multiple definition of `main'
/tmp/LinuxMain-4748b9.o:/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Tests/LinuxMain.swift:(.text+0x0):
first defined here
clang-3.8: error: linker command failed with exit code 1 (use -v to see
invocation)
----------

so as best I can piece this together, the executable WindFarmIRR module is
now being found and its 'main' is in conflict with the entry point in
LinuxMain.swift. I suspect I still have something not quite right with the
naming conventions and directory layout.

I am on an up-to-date archlinux system, with packages clang-3.8.0-1 and
swift-development-DEVELOPMENT.SNAPSHOT.2016.05.09.a-2 (from AUR)

On Tue, May 24, 2016 at 11:47 AM, Daniel Dunbar <daniel_dunbar@apple.com> > wrote:

Currently your Tests subdirectory needs to be named WindFarmIRR, which is
not something we do a good job of diagnosing. I filed:
  [SR-1607] SwiftPM doesn't help diagnose mis-named test suites · Issue #5273 · apple/swift-package-manager · GitHub
to track fixing this.

- Daniel

> On May 24, 2016, at 7:05 AM, G J via swift-build-dev < >> swift-build-dev@swift.org> wrote:
>
> I am attempting to use unit tests on a swift project in linux with
Swift DEVELOPMENT.SNAPSHOT.2016.05.09.a.
>
> The executable is built in a module named WindFarmIRR with directory
structure:
>
> Package.swift
> Sources (D)
> main.swift
> irr.swift
> stringHelpers.swift
> Tests (D)
> LinuxMain.swift
> WindFarmIRRTests (D)
> WindFarmIRRTests.swift
>
>
> my test file, WindFarmIRRTests.swift, includes a line to import the
WindFarmIRR module: @testable import WindFarmIRR.
>
> I am able to build the module successfully. When I run swift test,
however, the build fails with an 'undefined reference to' error. Sample
output is:
>
> swift test
> Compile Swift Module 'WindFarmIRRTestsTestSuite' (1 sources)
> Linking .build/debug/WindFarmIRRTests.xctest
>
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug/WindFarmIRRTestsTestSuite.build/WindFarmIRRTests.swift.o:
In function
`_TFC25WindFarmIRRTestsTestSuite16WindFarmIRRTests26testCashFlowStructCashFlowfT_T_':
>
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Tests/WindFarmIRRTests/WindFarmIRRTests.swift:19:
undefined reference to `_TFV11WindFarmIRR8CashFlowCfT_S0_'
>
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug/WindFarmIRRTestsTestSuite.build/WindFarmIRRTests.swift.o:
In function
`_TFFC25WindFarmIRRTestsTestSuite16WindFarmIRRTests26testCashFlowStructCashFlowFT_T_u_KzT_GSqSd_':
>
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/Tests/WindFarmIRRTests/WindFarmIRRTests.swift:26:
undefined reference to `_TFV11WindFarmIRR8CashFlow8cashFlowfT_Sd'
> clang-3.8: error: linker command failed with exit code 1 (use -v to see
invocation)
> <unknown>:0: error: link command failed with exit code 1 (use -v to see
invocation)
> <unknown>:0: error: build had 1 command failures
> error: exit(1): /usr/bin/swift-build-tool -f
/home/greg/Dropbox/common_files/Programming/Swift/commercial/WindFutureLLC/WindFarmIRR/linux/WindFarmIRR-SwiftPM/.build/debug.yaml
test
>
> Text of LinuxMain.swift is:
> ------------------
> import XCTest
>
> @testable import WindFarmIRRTestsTestSuite
>
> XCTMain([
> testCase(WindFarmIRRTests.allTests)
> ])
> -------------------
>
> Text of WindFarmIRRTests.swift is:
> --------------------
> if os(Linux)
> extension WindFarmIRRTests {
> static var allTests : [(String, (WindFarmIRRTests) -> () throws ->
Void)] {
> return [
> ("testCashFlowStructCashFlow", testCashFlowStructCashFlow)
> ]
> }
> }
> #endif
>
> import XCTest
> @testable import WindFarmIRR
>
> class WindFarmIRRTests: XCTestCase {
>
>
> func testCashFlowStructCashFlow(){
>
> var cf = CashFlow()
> cf.electricitySaleIncome = 100
> cf.capitalCosts = 0
> cf.oAndMCosts = 0
> cf.transmissionCosts = 0
>
>
> XCTAssertEqual(cf.cashFlow(),100)
>
>
> }
>
> }
> ---------------------------
>
>
> The problem appears to be that the linker cannot find the executable
module to resolve the relevant symbols.
>
> I would appreciate suggestions on what I am missing in the setup.
>
>
> Thanks
>
> _______________________________________________
> swift-build-dev mailing list
> swift-build-dev@swift.org
> https://lists.swift.org/mailman/listinfo/swift-build-dev