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From:	Jim Garrison <jim DOT garrison AT nwea DOT org>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	RE: qsort_r and libc.a version?
Date:	Thu, 6 Feb 2014 23:29:13 +0000
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> -----Original Message-----
> Behalf Of Larry Hall (Cygwin)
> Sent: Thursday, February 06, 2014 11:39 AM
> Subject: Re: qsort_r and libc.a version?
> 
> On 2/6/2014 2:04 PM, Jim Garrison wrote:
> > I tried to build libgit2 so I could try to build gitg but encountered
> >
> >      undefined reference to `qsort_r'
> >
> > GitHub has a closed issue for this
> > https://github.com/libgit2/libgit2/issues/1606 saying that qsort_r was
> > added to glibc in version 2.8, released in 2008.
> >
> > Since libc in Cygwin is part of the base package, how would I find out
> > which upstream version it's based on?
> 
> Cygwin uses newlib for its C library.  From what I can see, qsort is there but
> qsort_r isn't.
> 
> > There was a commit in libgit2 that was supposed to fix this :
> >
> >
> https://github.com/libgit2/libgit2/commit/0d77647adc1f76df66e437e6442d
> > 7f7706e2c38e#diff-bb2cd4651768482b99cb1c52d29ceffdR694
> >
> > but I don't know enough about Cygwin internals to determine why it
> > still fails on Cygwin.
> 
> The problem with that patch is that it doesn't take Cygwin into account.
> If you append a check for Cygwin there as well (i.e. defined(__CYGWIN__) )
> then that should resolve the compile issue.
> 
> --
> Larry

So the correct patch for this would be to treat __CYGWIN__ the same as __MINGW32__ and use the internal git__insertsort_r function?

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