cmake: Apply symbol visibility settings to Objective-C/C++ sources

Otherwise the Objective-C++ sources will be built with the default
compiler visibility (visible), and then linked with moc-generated
C++ sources that have the Qt overridden hidden visibility, resulting
in linker warnings such as:

  ld: warning: direct access in function 'X' from file 'moc_foo.cpp.o'
  to global weak symbol 'Y' from file 'bar.mm.o' means the weak symbol
  cannot be overridden at runtime. This was likely caused by different
  translation units being compiled with different visibility setting

Change-Id: I22e15e7e181a74de8c0a22c73d06e600e582d7fd
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

0 files changed, 0 insertions, 0 deletions