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Support using unversioned lld as linker too #8189

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merged 2 commits into from
Nov 22, 2021

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omajid
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@omajid omajid commented Nov 16, 2021

On Fedora and RHEL the lld executable is the plain unversioned lld. That's also usable as a linker if it's recent enough.

See dotnet/runtime#58959 (comment)
for more details and discussion.

We have been carrying the 6.0 version of this patch for RHEL 8 on arm64 here: https://git.centos.org/rpms/dotnet6.0/blob/c8s/f/SOURCES/runtime-arm64-lld-fix.patch

There was an open question about parsing the lld version using clang like so:

$ clang -fuse-ld=lld -Wl,--version
LLD 13.0.0 (compatible with GNU linkers)

Is that worth implementing?

cc @am11 @crummel @janvorli

On Fedora and RHEL the `lld` executable is the plain unversioned `lld`.
That's also usable as a linker if it's recent enough.

See dotnet/runtime#58959 (comment)
for more details and discussion.
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am11 commented Nov 16, 2021

Looks good to me as it is. :)

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I think that checking for lld via clang is a better way. We never execute lld directly, so we really care about the one that clang selects by itself. Especially when you have multiple clang / lld versions installed (like I do). Clang seems to always pick lld of the same version.
If you call just lld, above, there is no guarantee that the lld will be seen by clang.

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LGTM, thank you!

@omajid omajid changed the title Support using unversioend lld as linker too Support using unversioned lld as linker too Nov 16, 2021
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omajid commented Nov 22, 2021

If this looks good to everyone, can someone please merge this? I dont have merge powers.

@janvorli janvorli merged commit 9a3b642 into dotnet:main Nov 22, 2021
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omajid commented Nov 22, 2021

Thanks!

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3 participants