vexcl

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I am facing this error after including vexcl. Even if i specify the backend it shows the error. #include <vexcl/vexcl.hpp>

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from /home/kafi/Documents/Projects/CODD-pro-lib_integration/main.cpp:14: /usr/include/boost/date_time/date_generators.hpp: In member function ‘virtual std::string boost::date_time::nth_kday_of_month<date_type>::to_string() const’: /usr/include/boost/date_time/date_generators.hpp:237:8: error: ambiguous overload for ‘operator<<’ (operand types are ‘std::basic_ostream’ and ‘int’) 236 | ss << 'M' | ~~~~~~~~~ | | | std::basic_ostream 237 | << static_cast(month_) << '.' | ^~ ~~~~~~~~~~~~~~~~~~~~~~~~ | | | int In file included from /usr/include/c++/9/iterator:64, from /usr/include/CL/cl.hpp:219,

I can not reproduce this with g++ 11. The following compiles for me:

#include <vexcl/vexcl.hpp>

int main() {
    std::cout << 'M' << std::endl;
}