[Openmp-dev] Offloading build fails

[Itaru Kitayama via Openmp-dev]

I am not sure what's going on with the trunk clang at this moment.

$ cat a.cpp
#include <iostream>
int main() {
}

$ clang++ -std=c++11 -fopenmp -fopenmp-targets=nvptx64 a.cpp
In file included from a.cpp:1:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/iostream:39:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/ostream:38:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/ios:42:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/ios_base.h:41:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/locale_classes.h:40:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/string:52:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/basic_string.h:6159:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/ext/string_conversions.h:41:
In file included from
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/cstdlib:77:
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/std_abs.h:70:3:
error: declaration conflicts with target of using declaration already in
scope
  abs(double __x)
  ^
/p/scratch/cpcp0/pcp0151/opt/clang/201911040249/lib/clang/10.0.0/include/__clang_cuda_math_forward_declares.h:50:25:
note: target of using declaration
__DEVICE__ const double abs(const double);
                        ^
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/std_abs.h:52:11:
note: using declaration
  using ::abs;
          ^
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/std_abs.h:74:3:
error: declaration conflicts with target of using declaration already in
scope
  abs(float __x)
  ^
/p/scratch/cpcp0/pcp0151/opt/clang/201911040249/lib/clang/10.0.0/include/__clang_cuda_math_forward_declares.h:51:24:
note: target of using declaration
__DEVICE__ const float abs(const float);
                       ^
/gpfs/software/opt/gcc/7.2.0/lib/gcc/powerpc64le-unknown-linux-gnu/7.2.0/../../../../include/c++/7.2.0/bits/std_abs.h:52:11:
note: using declaration
  using ::abs;
          ^
2 errors generated.

On Sun, Nov 3, 2019 at 4:29 PM Itaru Kitayama <itaru.kitayama at gmail.com>
wrote:

> Building my app with trunk Clang with appropriate offloading flags fails:
>
> [ 32%] Building CXX object
> nestkernel/CMakeFiles/nestkernel.dir/archiving_node.cpp.o
> In file included from
> /p/project/cpcp0/pcp0151/projects/nest-simulator/nestkernel/archiving_node.cpp:30:
> In file included from
> /p/project/cpcp0/pcp0151/projects/nest-simulator/nestkernel/archiving_node.h:40:
> /p/project/cpcp0/pcp0151/projects/nest-simulator/nestkernel/nest_time.h:127:10:
> error: call to 'abs' is ambiguous
>   return std::abs( n );
>          ^~~~~~~~
> /p/project/cpcp0/pcp0151/projects/nest-simulator/nestkernel/nest_time.h:312:15:
> note: in instantiation of function template specialization
> 'nest::time_abs<long>' requested here
>     : tics( ( time_abs( t.t ) < LIM_MAX.steps )
>               ^
> /usr/include/stdlib.h:770:12: note: candidate function
> extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
>            ^
> /p/scratch/cpcp0/pcp0151/opt/clang/201911030759/lib/clang/10.0.0/include/__clang_cuda_cmath.h:56:24:
> note: candidate function
> __DEVICE__ const float abs(const float __x) { return ::fabsf((float)__x); }
>                        ^
> /p/scratch/cpcp0/pcp0151/opt/clang/201911030759/lib/clang/10.0.0/include/__clang_cuda_cmath.h:57:25:
> note: candidate function
> __DEVICE__ const double abs(const double __x) { return
> ::fabs((double)__x); }
>                         ^
> 1 error generated.
> make[2]: *** [nestkernel/CMakeFiles/nestkernel.dir/archiving_node.cpp.o]
> Error 1
> make[1]: *** [nestkernel/CMakeFiles/nestkernel.dir/all] Error 2
> make: *** [all] Error 2
>
> please note that without those offloading flags build as expected succeeds.
>
>
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