[swift-dev] problems with linking .tbd frameworks in test suite

Alex Lew alexl.mail+swift at gmail.com
Wed Dec 9 23:51:00 CST 2015

Gahh... yep, turns out I was using an old MacPorts version of ld. I thought
I'd cleared out gcc, ld, etc. from /opt/local/bin a while ago, but I guess
not. Should have been my first thought. Thanks! And sorry for bothering!


On Thu, Dec 10, 2015 at 12:25 AM, Daniel Dunbar <daniel_dunbar at apple.com>

> What version of ld are you using? (ld -v)
> If you have .tbd files in your SDK, then the ld that shipped with that
> version of Xcode should be capable of using them to link. The tools should
> be using that version of ld by default, but it is possible something is
> going wrong.
> If might help to run the command that is failing with "-v", and include
> the full command and its errors.
>  - Daniel
> On Dec 9, 2015, at 9:10 PM, Alex Lew via swift-dev < swift-dev at swift.org>
> wrote:
> Hi all,
> Apologies if this is not the right place to ask this.
> I built Swift successfully today, but was failing lots of tests because
> the linker couldn't find CoreFoundation (or other frameworks, including
> libsystem and libobjc). It looks like  ld was invoked with the arguments:
>  -syslibroot
> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk
> The MacOSX10.11.sdk/usr/lib directory *did* have the desired
> libraries/frameworks in it, but they had the extension .tbd, not .dylib,
> and I think that confused the linker. I commented out the following lines
> from swift/lib/Driver/ToolChains.cpp:
>   if (!context.OI.SDKPath.empty()) {
>     Arguments.push_back("-syslibroot");
>     Arguments.push_back(context.Args.MakeArgString(context.OI.SDKPath));
>   }
> (lines 915-918), reran util/build-script -t, and everything started
> working (presumably because the linker was now searching in /usr/lib, where
> the dylib files are).
> I'm curious to understand what was going on here. Should I have been using
> a different version of ld? Configured something else differently? I'm in a
> little over my head.
> Thank you!
> -Alex
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