[Bug 75400] regression in OpenCL since commit cc3aeac

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75400

--- Comment #5 from Francisco Jerez <currojerez at riseup.net> ---
(In reply to comment #4)
> I am also very surpised of what commit seems to start this. I have done the
> bisect making Arch packages, installing and then testing them. So, unless I
> have missed something, which is also possible, that's it.
> 
> I have recompiled at commit cc3aeac with debug information, but for some
> strange reason, gdb don't want to step into OpenCL functions.
> 
> Here's what I have guessed:
> 
> - Actually, the segfault comes from a fprintf with a "%s" and a null
> pointer. It can be solved by just adding a default case to
> 'clUtilErrorString'.
> 
> - The real problem happens with 'clGetPlatformIDs', which returns an error
> value of '-1001'.
> 
> I have triggered the return of 'CL_INVALID_VALUE', and tried various
> combinations of parameters to see if it changed anything. And seems to be
> one thing or the other.
> 
> I have checked the code at
> mesa/src/gallium/state_trackers/clover/api/platform.cpp (where
> clGetPlatformIDs is) and have no clue how it can be possible.
> 
> Sorry if this isn't enough information, but I completely clueless of what
> can be happening.
> 
> I will check again my packages to see if I have compiled some version and
> have called it other.
> 
> If I can help with anything else, just ask.

Most likely you're getting that segfault somewhere in the ICD loader because
it's unable to load Mesa's ICD library.  I guess that this hunk:

+if NEED_WINSYS_XLIB
+AM_CPPFLAGS += -DHAVE_WINSYS_XLIB
+endif

pulls in the XLIB pipe-loader back-end that was previously ifdef-ed out in
Clover builds, leading to undefined symbols in the resulting library.

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