When an exception is thrown inside a function called from std::call_once, the process is aborted. The exception should be propagated outside std::call_once.

#include <stdio.h>
#include <mutex>
#include <stdexcept>

int main()
{
	static std::once_flag flag;

	printf( "start\n" );
	try
	{
		std::call_once(
			flag,
			[&]()
			{
				throw std::runtime_error("thrown from once");
			} );
	}
	catch ( std::runtime_error const& exc )
	{
		printf( "%s\n", exc.what() );
	}
	printf( "end\n" );
	return 0;
}

bea@stbldap02:~/samples$ g++ -std=c++14 -pthread std_call_once_exception.cxx
bea@stbldap02:~/samples$ ./a.out
start
terminate called after throwing an instance of 'std::runtime_error'
  what():  thrown from once
IOT/Abort trap (core dumped)

BTW: the system on which I tested it should be the same as in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67478