GPU: Workaround for OpenCL

Author: davidrohr

Common/MathUtils/include/MathUtils/SMatrixGPU.h

@@ -516,12 +516,14 @@ class SMatrixGPU
   R mRep;
 };
 
+#ifndef __OPENCL__ // TODO: current C++ for OpenCL 2021 is at C++17, so no concepts. But we don't need this trick for OpenCL anyway, so we can just hide it.
 template <class T, unsigned int D1, unsigned int D2, class R, typename Y, typename X = Y>
   requires(sizeof(typename X::traits_type::pos_type) != 0) // do not provide a template to fair::Logger, etc... (pos_type is a member type of all std::ostream classes)
 GPUd() X& operator<<(Y& y, const SMatrixGPU<T, D1, D2, R>&)
 {
   return y;
 }
+#endif
 
 template <class T, unsigned int D1, unsigned int D2, class R>
 GPUdi() SMatrixGPU<T, D1, D2, R>::SMatrixGPU(SMatrixIdentity)

GPU/GPUTracking/dEdx/GPUdEdx.h

@@ -212,7 +212,7 @@ GPUdi() void GPUdEdx::fillSubThreshold(int32_t padRow, const GPUParam& GPUrestri
   mNSubThresh++;
 }
 
-#endif // !GPUCA_HAVE_O2HEADERS || __OPENCL1__
+#endif // !GPUCA_HAVE_O2HEADERS || GPUCA_OPENCL1
 } // namespace gpu
 } // namespace GPUCA_NAMESPACE