[swift-dev] Android: wrong ld (linker) keeps being invoked

[Eric Wing]

On 9/25/16, Brian Gesiak <modocache at gmail.com> wrote:
> Eric,
>
> This is definitely something I'd like to improve. I believe karwa's new
> `-tools-directory` option (https://github.com/apple/swift/pull/2912 and
> https://github.com/apple/swift/pull/4543) could take care of this problem.
> If so, we should update docs/Android.md to recommend using that. Could you
> try using that?
>
> As for me, I've found success with the symlink solution up until now. I'm
> not sure why it doesn't work in your case...
>
> I believe that in later versions of Clang, -fuse-ld accepts full paths to
> linkers. So it may work if you have a sufficiently recent version --
> although I haven't tried myself.
>
> - Brian Gesiak
>
>
>
> On Sat, Sep 24, 2016 at 8:26 PM, Eric Wing via swift-dev <
> swift-dev at swift.org> wrote:
>
>> I'm being hit by the problem where the wrong linker is being invoked
>> when trying to build a program with swiftc for Android.
>>
>> The problem seems to already be known and reported here, but the
>> solutions/workarounds don't fully work for me:
>> https://bugs.swift.org/browse/SR-1264
>>
>> The only way I can make this work is by removing/renaming my system
>> installed /usr/bin/ld.gold so the process can't find it.
>>
>>
>> - Changing my PATH so another ld.gold is found first didn't affect
>> things. It looks like it always prefers /usr/bin/ld.gold.
>>
>> - Adding the symlink for /usr/bin/armv7-none-linux-androideabi-ld.gold
>> didn't help (until I removed my /usr/bin/ld.gold
>>
>> - Using the -use-ld=  switch seemed to have absolutely no effect for
>> me. (I tried multiple things like armv7 to find an ld.armv7 and also
>> tried full explicit paths to the real android ld.gold)
>>
>> Any ideas on how to fix this? I don't like having to remove my system
>> ld.gold.
>>
>> Thanks,
>> Eric
>> _______________________________________________
>> swift-dev mailing list
>> swift-dev at swift.org
>> https://lists.swift.org/mailman/listinfo/swift-dev
>>
>

After a long delay...

The -tools-directory flag worked.

I also played with -fuse-ld:
I'm invoking swiftc, whicn in turn invokes -fuse-ld behind the scenes.
I didn't try a full path, but I did try renaming the ld tool to
arm-linux-androideabi-ld.gold with the swiftc flag -use-ld. But that
seemed to confuse the process. I'm not sure why. But once I saw there
was a file called ld.gold in a different ndk directory, the
-tools-directory was all I needed.

Thanks,
Eric