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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/96390] New: [OpenMP] Link errors on the offload side
 for C++ code with templates
Date: Thu, 30 Jul 2020 12:53:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96390

            Bug ID: 96390
           Summary: [OpenMP] Link errors on the offload side for C++ code
                    with templates
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: openmp
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

sollve_vv's tests/4.5/application_kernels/gemv_target_reduction.cpp fails to
link when compiling with -O0.

Note: with -O1 and higher, it becomes a host-only code, which works.


Testcase:
https://github.com/SOLLVE/sollve_vv/blob/master/tests/4.5/application_kerne=
ls/alpaka_complex_template.cpp

g++ -fopenmp alpaka_complex_template.cpp -O0


Namely, with GCN:

ld: error: undefined symbol: S<0>::S()
>>> referenced by /tmp/ccGooH3g.o:(main._omp_fn.2)
>>> referenced by /tmp/ccGooH3g.o:(main._omp_fn.2)

ld: error: undefined symbol: V<1>::V<unsigned long, void>(unsigned long&&)
>>> referenced by /tmp/ccGooH3g.o:(main._omp_fn.2)
>>> referenced by /tmp/ccGooH3g.o:(main._omp_fn.2)

And likewise with nvptx:

libgomp: Link error log ptxas application ptx input, line 262; error   : La=
bel
expected for argument 0 of instruction 'call'
ptxas application ptx input, line 262; error   : Function '_ZN1SILi0EEC1Ev'=
 not
declared in this scope
ptxas application ptx input, line 262; error   : Call target not recognized
ptxas application ptx input, line 276; error   : Label expected for argumen=
t 0
of instruction 'call'
ptxas application ptx input, line 276; error   : Function
'_ZN1VILi1EEC1ImvEEOT_' not declared in this scope

which demangles to the same symbols.=