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For test case execution, CheckCSourceCompiles is now used instead of try_compile and the determination of DBUS_VA_AS_ARRAY is performed with a separate test instead of evaluating the result of HAVE_VA_COPY and HAVE___VA_COPY. The tests are performed for all supported compilers. Since older MSVC compilers (< 2013) do not support va_copy(), the macro _DBUS_VA_ASSIGN(a1,a2) with the implementation { a1 = a2; } is used as a fallback.
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