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runtime: rename GODEBUGCPU=foo=bar to #28757

rsc opened this issue Nov 13, 2018 · 2 comments


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commented Nov 13, 2018

We have successfully managed to use a single GODEBUG environment variable for runtime, net, and net/http. It doesn't really make sense to have the runtime add a second. It's not that special. Instead we should add the functionality currently in GODEBUGCPU to GODEBUG, with longer key names.

Go 1.12 intends to document the new cpu controls (see #27218), so we should change this for Go 1.12. (It has never been documented before.)

/cc @martisch @aclements

@rsc rsc added this to the Go1.12 milestone Nov 13, 2018

@rsc rsc added the release-blocker label Nov 13, 2018


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commented Nov 13, 2018

SGTM. I will make the changes to move GODEBUGCPU functionality into GODEBUG for Go 1.12.

@martisch martisch self-assigned this Nov 13, 2018


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commented Nov 14, 2018

Change mentions this issue: internal/cpu: move GODEBUGCPU options into GODEBUG

@gopherbot gopherbot closed this in 0a40d45 Nov 14, 2018

bradfitz pushed a commit that referenced this issue Nov 21, 2018

internal/cpu: move GODEBUGCPU options into GODEBUG
Change internal/cpu feature configuration to use
instead of GODEBUGCPU=feature1=value,feature2=value... .

This is not a backwards compatibility breaking change
since GODEBUGCPU was introduced in go1.11 as an
undocumented compiler experiment.

Fixes #28757

Change-Id: Ib21b3fed2334baeeb061a722ab1eb513d1137e87
Run-TryBot: Martin Möhrmann <>
TryBot-Result: Gobot Gobot <>
Reviewed-by: Brad Fitzpatrick <>
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