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Re: [PATCH 2/n] OpenMP 4.0 offloading infrastructure: LTO streaming

On Wed, Oct 08, 2014 at 10:45:22AM +0200, Jakub Jelinek wrote:
> And, once there is an option to select which offload targets to generate
> code for (or none), initialize_offload () should supposedly return false
> if the user requested no offloading on the command line.

After some thought, I take this back.  We should always stream
.gnu.offload_lto_* if we have any target regions or omp declare target
functions/vars.  The decision should be done during linking, if the user
wants only host fallback, during linking we should just throw away those
.gnu.offload_lto_* sections (could also tweak defaults for that e.g.
in libgomp.spec).  Thinking with a distro hat now, if gcc is configured
as offloading for say MIC, PTX and HSA?, it would be nice if the default
choice was dependent on which offloading compilers the user decided to actually
install.  So one could add a default for
if MIC offloading compiler is installed and PTX/HSA is not (for example,
don't remember the name of the option we discussed).


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