5638881e5b
This moves 'unittests/tests-cpp_ctors' to its own test. It prevents requiring 'cpp' in the 'unittests' that forced almost all architectures to link the unittests with `g++`. It also removes the need to have disabled tests for architectures. Some boards were actually not big enough to compile unittests. But were hidden by the 'cpp' missing feature. Blacklist boards that were disabled for cpp test even though they provide the 'cpp' feature.
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The purpose of this test is to ensure that C++ constructors are executed properly during the startup of RIOT. This requires that the port calls constructors somewhere during C-library initialization. On newlib ports this is done by __libc_init_array(), other ports may need to manually iterate through the list of initializer functions (usually .init_array), and call each one in order.
There are three tests:
- Global constructor
- Static constructor
- Local constructor
The global constructor test checks to see if the constructor of a global object has been run during the boot process. The static constructor test does the same, but for static object inside a function. The local constructor test checks that a locally created object does have its constructor run. The local constructor test will only fail if there is a significant problem with the C++ tool chain, since it does not rely on any external C++ support code.