[committed,OG10] amdgcn: Handle early debug info in mkoffload

[Andrew Stubbs]

On 16/07/2020 16:06, Andrew Stubbs wrote:
> This patch adds debug support to mkoffload, similar to what happens in 
> lto-wrapper.
> 
> Unlike lto-wrapper, we must deal with mismatched architectures and 
> mismatched program scope. These are fixed up using manual ELF patching 
> because there's no useful support in simple_object (yet). Should this be 
> something that other offload targets want to do then that probably ought 
> to be changed in future, but it isn't necessary yet.
> 
> This is enough to prevent rocgdb choking on malformed debug information 
> and debug simple offload testcases; it may be that further adjustment is 
> needed.
> 
> I have not attempted to make similar changes to the other instance of 
> mkoffload as nvptx has no use for debug info.

This patch is now backported to devel/omp/gcc-10.

Andrew