make -j8 fails for ghc-6.12.1-pre

[juhpetersen]

I can provide more details I think but parallel make with 8 jobs failed for me with ghc-6.12.1-pre. make -j4 seems worked ok.

[igloo]

Can you tell us what went wrong please?

[simonmar]

No response from submitter, and I can't make it fail here. I have seen a problem where multiple ghc-pkg invocations trip over each other, but I can't seem to repeat it now. Let's close this ticket and re-open it (or a new one) if the problem reappears.

[michalt]

I seem to be able to reproduce the bug. The build fails when used with at least -j8 (i.e. I couldn't reproduce it with -j set to 7 or lower). It seems that the mkdirhier script is run before it's actually ready. I'm attaching the build log. Please let me know if you need any more information.

[michalt]

The build log.

[igloo]

Thanks for the report. Happily, this is already fixed in the HEAD. 6.12 branch has

rts/dist/build/sm/Evac_thr.c : rts/sm/Evac.c
    "$(MKDIRHIER)" $(dir $@)
    cp $< $@

while HEAD has

rts/dist/build/sm/Evac_thr.c : rts/sm/Evac.c | $$(dir $$@)/.
    cp $< $@