Doesn't provide useful message when clError is thrown

[baryluk]

LuxMark v4.0 alpha0 on Linux amd64.

I installed pocl just for kicks, and tried running luxmark.

It does build the scene, BVH and compiles all the kernels fine, but then aborts:

terminate called after throwing an instance of 'cl::Error'
  what():  clCreateBuffer
--Type <RET> for more, q to quit, c to continue without paging--

Thread 1 "luxmark.bin" received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff150855b in __GI_abort () at abort.c:79
#2  0x0000555556a76265 in __gnu_cxx::__verbose_terminate_handler() ()
#3  0x00005555569d8dd6 in __cxxabiv1::__terminate(void (*)()) ()
#4  0x00005555569d8e21 in  ()
#5  0x00005555569da344 in  ()
#6  0x00005555558796f4 in cl::detail::errHandler(int, char const*) [clone .part.34] ()
#7  0x0000555555eac028 in luxrays::OpenCLIntersectionDevice::OpenCLDeviceQueue::OpenCLDeviceQueueElem::OpenCLDeviceQueueElem(luxrays::OpenCLIntersectionDevice*, cl::CommandQueue*, unsigned int, unsigned long) ()
#8  0x0000555555eb0e92 in luxrays::OpenCLIntersectionDevice::OpenCLDeviceQueue::OpenCLDeviceQueue(luxrays::OpenCLIntersectionDevice*, unsigned int, unsigned long) ()
#9  0x0000555555eb11d6 in luxrays::OpenCLIntersectionDevice::Start() ()
#10 0x0000555555e57296 in luxrays::Context::Start() ()
#11 0x0000555555d446ab in slg::Film::CreateOCLContext() ()
#12 0x0000555555d3d7d0 in slg::Film::ExecuteImagePipelineImpl(unsigned int) ()
#13 0x0000555555d3a8cd in float const* slg::Film::GetChannel<float>(slg::Film::FilmChannelType, unsigned int, bool) ()
#14 0x00005555559398c4 in luxcore::detail::FilmImpl::GetChannelFloat(luxcore::Film::FilmChannelType, unsigned int, bool) ()
#15 0x000055555591ee97 in LuxCoreRenderSession::UpdateFrameBuffer(unsigned int) ()
#16 0x00005555558f16b7 in LuxMarkApp::RenderRefreshTimeout() ()
#17 0x00007ffff1aee388 in QMetaObject::activate(QObject*, int, int, void**) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ffff1afb10a in QTimer::timeout(QTimer::QPrivateSignal) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007ffff1aeed45 in QObject::event(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007ffff270fc32 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007ffff2719190 in QApplication::notify(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007ffff1ac3a52 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#23 0x00007ffff1b18b90 in QTimerInfoList::activateTimers() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007ffff1b1944c in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007ffff0aa260d in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007ffff0aa2890 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ffff0aa291f in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ffff1b197c1 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007ffff1ac26db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007ffff1aca182 in QCoreApplication::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x000055555588026e in main ()
(gdb) q

Would be nice if the int and char const* part of the error were displayed back to stderr, so I can investigate deeper, before abort is called.

Due to lack of debug symbols I couldn't debug it too far with precompiled binaries. errno had a value 11 (EAGAIN), but not sure if this is related.

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