Cannot build CTS

[nyalloc]

Trying to build the SYCL CTS fails to build when using the lastest Intel LLVM.

cmake -DSYCL_IMPLEMENTATION=Intel_SYCL -DINTEL_SYCL_ROOT=/home/stuart/2021/llvm/build ../
make

Results in numerous failures with the same complaint:

In file included from /home/stuart/2021/llvm/build/bin/../include/sycl/CL/sycl.hpp:16:
In file included from /home/stuart/2021/llvm/build/bin/../include/sycl/CL/sycl/ONEAPI/reduction.hpp:14:
/home/stuart/2021/llvm/build/bin/../include/sycl/CL/sycl/handler.hpp:819:9: error: no matching function for call to object of type 'const accessor_utility::buffer_accessor_api_r<int, 0, sycl::access::mode::read, sycl::access::target::global_buffer, sycl::access::target::global_buffer, sycl::access::placeholder::false_t>'
        KernelFunc(Arg);
        ^~~~~~~~~~

[bader]

@nyalloc, unfortunately, I can't reproduce this problem.

/home/stuart/2021/llvm/build/bin/../include/sycl/CL/sycl/handler.hpp:819:9: error: no matching function for call to object of type 'const accessor_utility::buffer_accessor_api_r<int, 0, sycl::access::mode::read, sycl::access::target::global_buffer, sycl::access::target::global_buffer, sycl::access::placeholder::false_t>'
        KernelFunc(Arg);
        ^~~~~~~~~~

Line 819, doesn't look like this in the latest version of the source code. Could you check if your build directory is up-to-date, please?

[v-klochkov]

I don't know if CTS that I am using is the latest one. It is reproducible for me.
Below is the reduced version of one of failed CTS tests:

#include <CL/sycl.hpp>

struct MyFunctor {
void operator()(cl::sycl::id<1> idx) {}
};

void run() {
cl::sycl::queue queue;
queue.submit([&](cl::sycl::handler &handler) {
handler.parallel_for(cl::sycl::range<1>{8}, MyFunctor());
});
}

clang++ -fsycl accessor_api_buffer.cpp

15:44:29 > clang++ -fsycl accessor_api_buffer.cpp
In file included from accessor_api_buffer.cpp:1:
In file included from /export/users/vklochko/ws/gs_public/llvm/build/install/bin/../include/sycl/CL/sycl.hpp:16:
In file included from /export/users/vklochko/ws/gs_public/llvm/build/install/bin/../include/sycl/CL/sycl/ONEAPI/reduction.hpp:15:
/export/users/vklochko/ws/gs_public/llvm/build/install/bin/../include/sycl/CL/sycl/handler.hpp:823:9: error: no matching function for call to object of type 'const MyFunctor'
KernelFunc(Arg);
^~~~~~~~~~
/export/users/vklochko/ws/gs_public/llvm/build/install/bin/../include/sycl/CL/sycl/handler.hpp:1035:5: note: in instantiation of function template specialization 'sycl::handler::parallel_for_lambda_impl<sycl::detail::auto_name, MyFunctor, 1>' requested here
parallel_for_lambda_impl(NumWorkItems, std::move(KernelFunc));
^
accessor_api_buffer.cpp:10:13: note: in instantiation of function template specialization 'sycl::handler::parallel_for<sycl::detail::auto_name, MyFunctor>' requested here
handler.parallel_for(cl::sycl::range<1>{8}, MyFunctor());
^
accessor_api_buffer.cpp:4:8: note: candidate function not viable: 'this' argument has type 'const MyFunctor', but method is not marked const
void operator()(cl::sycl::id<1> idx) {}
^
1 error generated.

Adding 'const' specifier to the MyFunctor::operator() fixes the problem.

[bader]

@v-klochkov, you should build SYCL-CTS with -sycl-std=121 option ON.
If you are building source from https://github.com/KhronosGroup/SYCL-CTS/ repository, please, make sure that it contains this commit -
KhronosGroup/SYCL-CTS@856f9a2.

[v-klochkov]

I forgot to write that, but with -sycl-std=121 the error is the same. A month or two ago -sycl-std=121 worked as a workaround for that issue, but not now. Probably, something got pulled to compiler

[v-klochkov]

The problem is caused by the fix #2703

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