GNU logs - #63238, boring messages

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Subject: bug#63238: issue linking to librt
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Hello All,

I believe I have stumbled on an issue with how the libraries in glibc are stored.
If I run "ld -lrt" it reports "ld: cannot find -lrt: No such file or directory"
Meanwhile, I can find librt with "ldconfig -p | grep librt": "librt.so.1 ... => /gnu/store/...".

In order to get ld to find librt I need to take the following steps:
- make a folder I can write to (not .~/guix-profile/lib)
- symlink ~/.guix-profile/lib/librt.so.1 to /my-folder/librt.so
- add the corresponding option to ld: "ld -lrt -L ~/lib"
Then ld is able to find librt.

I stumbled on this while trying to compile a rust project with "cargo build".
Compiling any dependency that relied on libc failed on linking to librt.

Feel free to let me know if there is some Guix facility I should be using instead. I am pretty new to this. I tried using cargo in a Guix shell but the same problem persisted.


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<!DOCTYPE html><html><head><title></title><style type=3D"text/css">p.Mso=
Normal,p.MsoNoSpacing{margin:0}</style></head><body><div>Hello All,<br><=
/div><div><br></div><div><div>I believe I have stumbled on an issue with=
 how the libraries in glibc are stored.<br></div><div><div>If I run "ld =
-lrt" it reports "ld: cannot find -lrt: No such file or directory"<br></=
div><div>Meanwhile, I can find librt with "ldconfig -p | grep librt": "l=
ibrt.so.1 ... =3D&gt; /gnu/store/...".<br></div><div><br></div><div>In o=
rder to get ld to find librt I need to take the following steps:<br>- ma=
ke a folder I can write to (not .~/guix-profile/lib)</div><div><div>- sy=
mlink ~/.guix-profile/lib/librt.so.1 to /my-folder/librt.so<br></div><di=
v>- add the corresponding option to ld: "ld -lrt -L ~/lib"<br></div><div=
>Then ld is able to find librt.<br></div><div><br></div><div><div>I stum=
bled on this while trying to compile a rust project with "cargo build".<=
br></div></div><div>Compiling any dependency that relied on libc failed =
on linking to librt.<br><br>Feel free to let me know if there is some Gu=
ix facility I should be using instead. I am pretty new to this. I tried =
using cargo in a Guix shell but the same problem persisted.<br></div></d=
iv><div><br></div></div></div><div><br></div></body></html>
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: "Ava Hahn" <avavava@HIDDEN>
Subject: bug#63238: Acknowledgement (issue linking to librt)
Message-ID: <handler.63238.B.168307839920794.ack <at> debbugs.gnu.org>
References: <bde5cd5a-e029-4243-8668-f59b4a8d5237@HIDDEN>
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Date: Wed, 03 May 2023 01:47:02 +0000

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Subject: bug#63238: (no subject)
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Date: Wed, 03 May 2023 20:40:08 -0700
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I encountered the same issue recently. I used to be able to compile with 
`cargo build` just fine just a few days ago. I recently upgraded my 
system from glibc 2.33 to 2.35, and I'd guess it's related to that. 
However, running it in `guix shell glibc@HIDDEN` results in the same 
problem, so I'm not sure.
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=
eva,sans-serif'>
<p>I encountered the same issue recently. I used to be able to compile with=
 `cargo build` just fine just a few days ago. I recently upgraded my system=
 from glibc 2.33 to 2.35, and I'd guess it's related to that. However, runn=
ing it in `guix shell <a href=3D"mailto:glibc@HIDDEN&#96;">glibc@HIDDEN`</a> re=
sults in the same problem, so I'm not sure.</p>

</body></html>

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Message sent to bug-guix@HIDDEN:

Subject: bug#63238: issue linking to librt
Resent-From: Brian Cully <bjc@HIDDEN>
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Resent-Date: Fri, 26 May 2023 15:59:01 +0000
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From: Brian Cully <bjc@HIDDEN>
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 (semilin@HIDDEN's message of "Wed, 03 May 2023 20:40:08 -0700")
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 <0579ac0dfb2cbf24b0375185eb0f4665@HIDDEN>
Date: Fri, 26 May 2023 11:58:46 -0400
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librt and libpthread were merged into libc with glibc 2.34, however, for
compatibility, there exist empty .a files to satisfy the linker. But
because Guix has a separate output for the static libraries, they need
to be explicitly installed from =E2=80=98glibc:static=E2=80=99, which allow=
s Cargo to do
its thing.

Cargo itself should probably be fixed so that it no longer tries to link
with these libraries, but until that time, the above work-around suffices.

Last modified: Fri, 26 May 2023 16:00:02 UTC

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