[Bug libc/26558] New: [meta] Build glibc with LLD

[Bug libc/26558] New: [meta] Build glibc with LLD

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26558

            Bug ID: 26558
           Summary: [meta] Build glibc with LLD
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Some known issues:

* elf/librtld.map.o uses a subtle property of --defsym:
https://sourceware.org/pipermail/libc-alpha/2020-April/112732.html
* ld.lld --verbose does not print a linker script and ld.lld
--print-output-format is not supported:
https://sourceware.org/pipermail/libc-alpha/2020-April/112733.html
* Neither clang nor LLD may support the semantics of .tls_common
https://sourceware.org/pipermail/libc-alpha/2020-April/112734.html

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[Bug libc/26558] [meta] Build glibc with LLD

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26558

Fangrui Song <i at maskray dot me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |26559


Referenced Bugs:

https://sourceware.org/bugzilla/show_bug.cgi?id=26559
[Bug 26559] Get OUTPUT_FORMAT from objdump -f to support LLD
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[Bug libc/26558] [meta] Build glibc with LLD

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26558

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-09-01
     Ever confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Fangrui Song from comment #0)
> Some known issues:
> 
> * elf/librtld.map.o uses a subtle property of --defsym:
> https://sourceware.org/pipermail/libc-alpha/2020-April/112732.html

Since --defsym in ldd is incompatible with glibc build, --defsym should be
poisoned for glibc build.

> * ld.lld --verbose does not print a linker script and ld.lld
> --print-output-format is not supported:
> https://sourceware.org/pipermail/libc-alpha/2020-April/112733.html
> * Neither clang nor LLD may support the semantics of .tls_common
> https://sourceware.org/pipermail/libc-alpha/2020-April/112734.html

This is used to implement STT_COMMON.  Do clang/LLD support STT_COMMON?

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[Bug libc/26558] [meta] Build glibc with LLD

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26558

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
I think you should make your glibc branch for lld available so that people
can give it a try.

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[Bug libc/26558] [meta] Build glibc with LLD

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26558

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl.tools at gmail dot com

--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
Before lld can be accepted for glibc build, it must generate the same set
of failures in glibc testsuite with binutils 2.35 at least on i686 and x86-64.

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[Bug libc/26558] [meta] Build glibc with LLD

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26558
Bug 26558 depends on bug 26559, which changed state.

Bug 26559 Summary: Get OUTPUT_FORMAT from objdump -f to support LLD
https://sourceware.org/bugzilla/show_bug.cgi?id=26559

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED

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[Bug libc/26558] [meta] Build glibc with LLD

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=26558

Fangrui Song <i at maskray dot me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #4 from Fangrui Song <i at maskray dot me> ---
Fixed by
https://sourceware.org/git/?p=glibc.git;a=commit;h=224edada607ebc6aaa1aadaae423128fae7880df
("configure: Allow LD to be LLD 13.0.0 or above [BZ #26558]")

Target: 2.35

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