Wrapping ImageMagick in a Swift Package

Using Swift
1

Hi,

I am trying to create a Swift Package that wraps the ImageMagick C API. So I installed ImageMagick using MacPorts and
I was then able to build the sample program with the following commands:

export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig
cc main.c `pkg-config --cflags --libs MagickWand`

Then I created a package with the command "swift package init --type=system-module" and I modified Package.swift to look
like this:

// swift-tools-version:4.0

import PackageDescription

let package = Package(
  name: "TestPkg",
  pkgConfig: "MagickWand"
)

and I modified module.modulemap to the following:

module TestPkg [system] {
  header "/opt/local/include/ImageMagick-6/wand/MagickWand.h"
  link "MagickWand-6.Q16"
  link "MagickCore-6.Q16"
  export *
}

Now when I run "swift build", I get the following error message:

<unknown>:0: error: unexpected 'commands' value (expected map)
<unknown>:0: error: unable to load build file
error: terminated(1): /Library/Developer/Toolchains/swift-4.0-DEVELOPMENT-SNAPSHOT-2017-08-27-a.xctoolchain/usr/bin/swift-build-tool -f /Users/tonisuter/Desktop/TestPkg/.build/debug.yaml main

Does anybody know how I can fix this error?

Thanks and best regards
Toni

2

Hi Toni,

You're not supposed to build the system module package (because there is
nothing to build). Tag and add this package as a dependency and then try to
import the `TestPkg` module that you defined in the modulemap. The error
here is bogus and is tracked by [SR-5383] Display appropriate message when trying to build system module packages · Issue #4988 · apple/swift-package-manager · GitHub

···

On Tue, Oct 3, 2017 at 12:32 AM, Toni Suter via swift-users < swift-users@swift.org> wrote:

Hi,

I am trying to create a Swift Package that wraps the ImageMagick C API. So
I installed ImageMagick using MacPorts and
I was then able to build the sample program with the following commands:

export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig
cc main.c `pkg-config --cflags --libs MagickWand`

Then I created a package with the command "swift package init
--type=system-module" and I modified Package.swift to look
like this:

// swift-tools-version:4.0

import PackageDescription

let package = Package(
name: "TestPkg",
pkgConfig: "MagickWand"
)

and I modified module.modulemap to the following:

module TestPkg [system] {
  header "/opt/local/include/ImageMagick-6/wand/MagickWand.h"
  link "MagickWand-6.Q16"
  link "MagickCore-6.Q16"
  export *
}

Now when I run "swift build", I get the following error message:

<unknown>:0: error: unexpected 'commands' value (expected map)
<unknown>:0: error: unable to load build file
error: terminated(1): /Library/Developer/Toolchains/swift-4.0-DEVELOPMENT-
SNAPSHOT-2017-08-27-a.xctoolchain/usr/bin/swift-build-tool -f
/Users/tonisuter/Desktop/TestPkg/.build/debug.yaml main

Does anybody know how I can fix this error?

Thanks and best regards
Toni

_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users

3

Hi Ankit,

Thank you very much! It works now :-)

Best regards,
Toni

···

Am 03.10.2017 um 21:50 schrieb Ankit Aggarwal <ankit_aggarwal@apple.com>:

Hi Toni,

You're not supposed to build the system module package (because there is nothing to build). Tag and add this package as a dependency and then try to import the `TestPkg` module that you defined in the modulemap. The error here is bogus and is tracked by [SR-5383] Display appropriate message when trying to build system module packages · Issue #4988 · apple/swift-package-manager · GitHub

On Tue, Oct 3, 2017 at 12:32 AM, Toni Suter via swift-users <swift-users@swift.org <mailto:swift-users@swift.org>> wrote:
Hi,

I am trying to create a Swift Package that wraps the ImageMagick C API. So I installed ImageMagick using MacPorts and
I was then able to build the sample program with the following commands:

export PKG_CONFIG_PATH=/opt/local/lib/pkgconfig
cc main.c `pkg-config --cflags --libs MagickWand`

Then I created a package with the command "swift package init --type=system-module" and I modified Package.swift to look
like this:

// swift-tools-version:4.0

import PackageDescription

let package = Package(
  name: "TestPkg",
  pkgConfig: "MagickWand"
)

and I modified module.modulemap to the following:

module TestPkg [system] {
  header "/opt/local/include/ImageMagick-6/wand/MagickWand.h"
  link "MagickWand-6.Q16"
  link "MagickCore-6.Q16"
  export *
}

Now when I run "swift build", I get the following error message:

<unknown>:0: error: unexpected 'commands' value (expected map)
<unknown>:0: error: unable to load build file
error: terminated(1): /Library/Developer/Toolchains/swift-4.0-DEVELOPMENT-SNAPSHOT-2017-08-27-a.xctoolchain/usr/bin/swift-build-tool -f /Users/tonisuter/Desktop/TestPkg/.build/debug.yaml main

Does anybody know how I can fix this error?

Thanks and best regards
Toni

_______________________________________________
swift-users mailing list
swift-users@swift.org <mailto:swift-users@swift.org>
https://lists.swift.org/mailman/listinfo/swift-users