gnumake: disable subsecond mtime on darwin#51408
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matthewbauer merged 1 commit intoNixOS:stagingfrom Dec 3, 2018
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GrahamcOfBorg
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Can you add a comment in the code? I can imagine someone discovering files not being rebuilt in one of their builds (the dual of our issue with |
Mic92
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Should this maybe carry a comment, when it should safe to re-enable this feature again?
i.e. a while after 10.13?
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endgame
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Your comment is pretty clear. I'll approve now but can you please add a link to a GH issue so someone can retrace steps if necessary?
gnumake can support subsecond mtimes if it is available. But Darwin doesn’t support setting subsecond mtimes until 10.13! So we can just disable this check to avoid the issue where most of our built tools use seconds but make uses nanoseconds. Might fix some parallel issues along the way. Fixes NixOS#51221
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This was disabled to fix NixOS#51093. The related discussion upstream revealed that this has been fixed in [1] for v12+. Since v12 is our oldest supported version right now, we should be able to safely enable parallel building on darwin again. Furthermore, it seems that this kind of issue was also fixed in NixOS#51221 and NixOS#51408 for the general case. [1]: postgres/postgres@826eff5
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gnumake can support subsecond mtimes if it is available. But Darwin
doesn’t support setting subsecond mtimes until 10.13! So we can just
disable this check to avoid the issue where most of our built tools
use seconds but make uses nanoseconds. Might fix some parallel issues
along the way.
Fixes #51221
/cc @endgame @delroth @thoughtpolice