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cmd/cgo: document mininum gcc version #43605

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rittneje opened this issue Jan 9, 2021 · 5 comments
Closed

cmd/cgo: document mininum gcc version #43605

rittneje opened this issue Jan 9, 2021 · 5 comments
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@rittneje
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rittneje commented Jan 9, 2021

When generating _cgo_export.c, cgo outputs several #pragma GCC diagnostic ignored directives. Such pragmas were introduced in gcc 4.6 (https://www.gnu.org/software/gcc/gcc-4.6/changes.html), so it would seem that at least that version is expected. (Ironically, the first pragma is to ignore unknown pragmas, but an older GCC will consider that to be an unknown pragma.)

Unfortunately, I can't find anywhere that the minimum version has been documented. It would be helpful if it were included on one of the wiki pages, such as https://github.com/golang/go/wiki/MinimumRequirements or https://github.com/golang/go/wiki/cgo.
@ianlancetaylor ianlancetaylor changed the title cgo: document mininum gcc version cmd/cgo: document mininum gcc version Jan 9, 2021
@ianlancetaylor
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GCC 4.6 was released in 2011.

I think it would be fine to add this the MinimumRequirements wiki page. Anybody can do that.

@ALTree
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ALTree commented Jan 9, 2021

I added this to MinimumRequirements. Closing here, but feel free to edit my wording if you wish.

@ALTree ALTree closed this as completed Jan 9, 2021
@AlexRouSg AlexRouSg mentioned this issue Mar 9, 2021
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@dwillemv
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We are using gcc version 4.8.3.
We are getting failures similar to those described at:
#44880
Using go 1.16.3.

With the repro from that case, the output looks like:
/home/willem/development/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
/usr/bin/ld: /dev/shm/go-link-383363645/000005.o: unrecognized relocation (0x2a) in section `.text'
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status

What is the correct minimum gcc version?

@ALTree
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ALTree commented Apr 15, 2021 •
edited

@dwillemv Are you sure you're not just hitting #43996?

@dwillemv
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You are correct. We are indeed hitting #43996. Thanks for the help.

@golang golang locked and limited conversation to collaborators Apr 15, 2022
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@dwillemv @ianlancetaylor @ALTree @gopherbot @rittneje