2014-12-08 12:18 GMT+03:00 Richard Biener <richard.guent...@gmail.com>: > On Thu, Dec 4, 2014 at 8:35 PM, Ilya Verbin <iver...@gmail.com> wrote: >> Hi, >> >> On 30 Sep 18:53, Ilya Verbin wrote: >>> This patch creates 2 vectors with decls: offload_funcs and offload_vars. >>> libgomp will use addresses from these arrays to look up offloaded code. >>> >>> During the compilation they are outputted to: >>> * binary __gnu_offload_funcs/vars sections, or using >>> targetm.record_offload_symbol hook for PTX. >> >> In some cases LTO may optimize out a global variable, declared as target, but >> it still will be referenced from the offload table, that will cause a linking >> error. Here is the example: >> >> #pragma omp declare target >> int G; >> #pragma omp end declare target > > So where is that "magic" target use then? Why doesn't the symtab > reachability code see the use? (why don't we prune it from the offload > table?) > > Richard.
Nowhere on host-side, but it can remain non-optimized on target-side, therefore we can not remove it only from the host offload table. -- Ilya
