Clover uses clang::CompilerInvocation::CreateFromArgs() which is roughly equivalent to clang -cc1 frontend and does not support GCC-like options, including -g, which is sometimes passed by OpenCL programs. Section 5.6.3 of OpenCL 1.1 spec  says: "This specification defines a standard set of options that must be supported by an OpenCL compiler when building program executables online or offline. These may be extended by a set of vendor-or platform-specific options."
Since -g is not mentioned in the spec, we can either:
1) Fail with "Clover does not support -g", which is what we do now but could be made more explicit.
2) Ignore it, that is s/-g//.
3) Figure out how to enable it and then s/-g/-whatever/ before passing it to clang.
Just thought I'd chime in here.
I don't necessary try to use '-g' when compiling cl kernels/programs in clover, but I have been poking at getting some programs working that relying on the CL1.2 'static' keyword...
I had been trying to enable that at one point by setting CLOVER_EXTRA_BUILD_OPTIONS to include "-Dcl_clang_storage_class_specifiers", as I found that manually invoking clang with that define set allowed me to build some of the kernels I was working with (e.g. blender cycles, along with some stuff from hcc and others).
But no matter what I set, including specifying -cl-std=1.2 (after bumping the supported version in [platform|device].cpp, it always seemed like the clang invocation was ignoring all of the indicated build options.
We may end up having to do number 3 anyway, as I feel like we're losing the user-specified compiler arguments somehow.
But there's always the possibility that I'm doing it wrong, so take this with a grain of salt.
Opencl defines are handled by clang and should not be set on command line, they are also target specific (although cl_storage_class_specifiers is enabled on all targets).
you can get the list of defines by running:
clang -dM -E -x cl -cl-std=cl1.1 - < /dev/null
for turks GPU:clang -cc1 -dM -E -x cl -cl-std=cl1.1 -triple r600-unknown-unknown -target-cpu turks - < /dev/null
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