System target library: How to use them?

Using Swift
1

Hello,

While trying to prepare a package to wrap a system library (libxml2), I noticed the following warning:

warning: system packages are deprecated; use system library targets instead

I could not find much documentation on how to use it, except the Swift evolution proposal: swift-evolution/0208-package-manager-system-library-targets.md at master · apple/swift-evolution · GitHub

Any tips on how to get started ? Where should I place my modulemap file ?

I would like to add the target system library in my package to avoid exposing an extra wrapper repository. It seems exactly what this features is about.

Thanks !

2

There is an updated howto here: swift-package-manager/Usage.md at 263171977ebcd47f4aaca1202cff5a96c5158a64 · apple/swift-package-manager · GitHub

4 Likes
3

Thanks, I confirm this is working fine.

4

Why then master branch has changed the document. This section has been deleted from the document. Confused.

5

Thanks for the link.

It works with my own .so shared library [1] written in C which is not a system library. It works without pkg-config, dnf, yum, apt, ..

Hope it won't break and continues to work in the future swift releases.

[1] GitHub - ljhm/Swift-C: Use C code from shared library in Swift

6

Hi, I tried without umbrella and the extra header files. I specified all header files and .so libraries in .modulemap file. It worked.
But is it guaranteed to be correct?

module.modulemap:
module clib {
header "/usr/include/stdio.h"
header "../../../hello/hello.h"
link "c"
link "hello"
}