[Bug 222757] Some problems in mesa ports related to OpenCL

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222757

            Bug ID: 222757
           Summary: Some problems in mesa ports related to OpenCL
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: shamaz.mazum at gmail.com
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Created attachment 186882
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=186882&action=edit
Gallium pipe-loader patch

Hello. I've tried OpenCL using lang/clover provider and encountered some
problems in mesa ports (can be fixed patching graphics/mesa-dri). I use FreeBSD
11.1 and have the port tree updated with portsnap and packages updated with
portupgrade

1) OpenCL applications do not work in X11 environment. I have exactly the same
problem as described here: bug #214204 (*) The fix is still the same, maybe
this is a regression. I attach patch which is combined from an old patch in
graphics/mesa-dri/files and the fix. I still do not know how to link -lxcb to
opencl targets. Autoconf is very complicated for me, so I do not know what to
do.

2) When I call clReleaseContext() from my program, it finishes OK, but program
crashes with segmantation fault when calls atexit handlers, having very strange
backtrace:

(gdb) bt
#0  0x0000000808534500 in ?? ()
#1  0x0000000800b754d5 in __cxa_finalize (dso=0x0) at
/usr/src/lib/libc/stdlib/atexit.c:237
#2  0x0000000800b063d1 in exit (status=0) at /usr/src/lib/libc/stdlib/exit.c:72
#3  0x0000000000400da6 in _start ()
#4  0x0000000800625000 in ?? ()
#5  0x0000000000000000 in ?? ()

clinfo has the same behaviour. I do not know the solution. Any suggestions?

(*) https://lists.freebsd.org/pipermail/freebsd-x11/2016-November/018240.html

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