[Bug 75400] regression in OpenCL since commit cc3aeac

[bugzilla-daemon at freedesktop.org]

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

--- Comment #4 from Bruno Jiménez <brunojimen at gmail.com> ---
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.

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