parallel build fixes for 7.4.2

[Ryan Newton]

By the way, it looks like the documentation for createDirectoryIfMissing
doesn't mention anything about its safety under concurrent invocation.

Looking at the code, it looks like it is safe (it handles the already exist
exception):


http://www.haskell.org/ghc/docs/latest/html/libraries/directory/src/System-Directory.html#createDirectoryIfMissing

But maybe the docs could reflect that....

-Ryan


On Fri, Feb 24, 2012 at 3:16 AM, Conrad Parker <conrad at metadecks.org> wrote:

> Hi,
>
> recently we've been tweaking our internal build system at Tsuru to
> handle parallel builds of both cabal packages via 'cabal-sort
> --makefile' and our local code tree via 'ghc -M'. In addition to the
> recompilation checker fixes of #5878, the following would be great to
> have in 7.4.2:
>
> 1) http://hackage.haskell.org/trac/ghc/ticket/5891 -- the patch fixes
> a race condition in creating parent directories for built object files
>
> 2) master commit b6f94b5 "Compile link .note section separately from
> main.c" -- I think this is the patch that fixes link errors we've seen
> during parallel builds (via ghc -M) with 7.4.1, such as:
>
> /x/y/z.o: file not recognized: File truncated
>
> and:
>
> /usr/bin/ld: BFD (GNU Binutils for Ubuntu) 2.20.51-system.20100908
> internal error, aborting at ../../bfd/merge.c line 872 in
> _bfd_merged_section_offset
>
> Will everything currently in master already be included in the next
> release or is it a separate branch? (If it's a separate branch I'll do
> some more testing to confirm that b6f94b5 is the patch that fixes the
> link error).
>
> Conrad.
>
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