Commits on Apr 2, 2018

1. epoxy: explicitly search libGL path as fallback …

   Don't rely on questionable impact of DT_RPATH on dlopen().
   
   This is a bit of a messy subject, but probably the clearest
   reference to motivate *not* relying on how dlopen() behaves
   in the presence of RPATH or RUNPATH is the following:
   
   https://sourceware.org/ml/libc-hacker/2002-11/msg00011.html
   
   FWIW the dlopen() manpage only mentions the the RPATH
   and RUNPATH in the "executable file for the calling program";
   no mention of the executable files for libraries--
   this has been brought to the attention of the relevant
   parties and AFAICT nothing has been done.
   
   The best reference for glibc behavior is
   apparently to ... "try it and see".
   Luckily a generous soul did exactly that
   and reported the findings:
   
   https://www.spinics.net/lists/linux-man/msg02291.html
   
   Qt wrote on the subject a bit when they were bit by this,
   linking to the above articles (directly or indirectly).
   
   See:
   http://blog.qt.io/blog/2011/10/28/rpath-and-runpath/
   
   --------
   
   Since we know the path of libGL at build-time for libepoxy,
   there's a simple solution we can use to avoid all of this:
   simply teach libepoxy to explicitly look in the libGL path.
   
   This commit patches libepoxy to accomplish this,
   looking to "LIBGL_PATH" as a fallback if it cannot find
   the libraries otherwise.
   
   ---------
   
   This fixes use of libepoxy w/musl on NixOS!

   

   dtzWill committed Apr 2, 2018
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2. Merge pull request #38168 from dtzWill/fix/epoxy-libgl-path …

   epoxy: explicitly search libGL path as fallback

   

   dtzWill committed Apr 2, 2018
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