[cmake-developers] Interface for GCC -fvisibility

[Simon Richter]

Hi,

I'm trying to replace our package's own test for the existence of the
-fvisibility flag with CMake's.

I've found CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY, which is set if the
flag exists, to something that you can directly append the desired
default visibility to, so this is used by extending CXXFLAGS with

   "${CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY}hidden"

That still looks awfully compiler-specific to me, besides being ugly.
Would it make sense to introduce a higher-level interface where I could
specify whether I want implicit or explicit exports, and it would do the
right thing?

There is the variable CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS that does the
exact opposite of the functionality I want -- basically I'd like to
declare that my program has all exported functionality marked in the
source code, and only these should be exported.

   Simon

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