When a static library link_whole to a bunch of other static libraries, we have to extract all their objects recursively. But that could introduce duplicated objects. ar is dumb enough to allow this without error, but once the resulting static library is linked into an executable or shared library, the linker will complain about duplicated symbols.
since 0.52 is indeed now required for this test case.
A build with a cross file should always be identified as a cross build, even if the host and build machine are identical. This was the case in 0.50, regressed in 0.51, and is fixed again in 0.52, so add a test case to ensure it doesn't regress again.
Fix `if not disabler()` case
Static libraries don't have PDB files. A PDB that would previously end up installed alongside a static library belonged in fact to the dynamic version of the same library built at the same time. This was because the former minstall.Installer implementation, when installing a file target, also blindly copied any *.pdb file it found whose filename was matching the target. So, for example installing foo.dll and foo.a would also install two copies of foo.pdb into both bin/ and lib/, which doesn't seem like the right thing to do - foo.pdb should only get installed with foo.dll.