[CMake] How to use DEFINE_SYMBOL properly?

[Hilton Medeiros]

Thanks a lot for the answers.

Indeed, I already knew this macro, but I thought that since this
visibility macro turns out to be always the same thing in every
project, CMake would have it built in. I can't see why this is not the
case yet.

Well, back to #defines...

Thanks again,
Hilton

On Tue, 9 Feb 2010 08:29:36 -0500
Mike Jackson <mike.jackson at bluequartz.net> wrote:

> http://www.cmake.org/Wiki/BuildingWinDLL
> 
> _________________________________________________________
> Mike Jackson                  mike.jackson at bluequartz.net
> BlueQuartz Software                    www.bluequartz.net
> Principal Software Engineer                  Dayton, Ohio
> 
> 
> 
> On Tue, Feb 9, 2010 at 8:25 AM, Pau Garcia i Quiles
> <pgquiles at elpauer.org> wrote:
> > Hello,
> >
> > You are doing it wrong. You need to create a header file
> > (myproject_exports.h, for instance) following
> > http://gcc.gnu.org/wiki/Visibility . If you call your visibility
> > macro target_EXPORTS, you do not need to modify the value of
> > DEFINE_SYMBOL at all, CMake will automagically make use of it. You
> > only need to do set_target_properties( target PROPERTIES
> > DEFINE_SYMBOL my_visibility_macro ) if you want to use a different
> > name for the macro (usually because it is an already-existing
> > project which you are converting to CMake).
> >
> > On Tue, Feb 9, 2010 at 1:25 PM, Hilton Medeiros
> > <medeiros.hilton at gmail.com> wrote:
> >> Hello,
> >>
> >> From what I read and understood this DEFINE_SYMBOL property should
> >> be defined like this (or something like this):
> >>
> >> On Windows, as shared library: target_EXPORTS=__declspec(dllexport)
> >> On Linux, as shared library:
> >> target_EXPORTS=__attribute__((visibility("default")))
> >>
> >>
> >> So that I can use this symbol like this:
> >>
> >> class target_EXPORTS ExampleClass {...};
> >>
> >>
> >> But on my machine (Linux, gcc) while building a shared library,
> >> with CMake 2.8.0, I'm getting the error below because CMake is
> >> defining this property with -Dtarget_EXPORTS=0:
> >>
> >> error: expected identifier before numeric constant
> >>
> >> What am I missing?
> >>
> >> Kind regards,
> >> Hilton
> >> _______________________________________________
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> >>
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> >
> >
> >
> > --
> > Pau Garcia i Quiles
> > http://www.elpauer.org
> > (Due to my workload, I may need 10 days to answer)
> > _______________________________________________
> > Powered by www.kitware.com
> >
> > Visit other Kitware open-source projects at
> > http://www.kitware.com/opensource/opensource.html
> >
> > Please keep messages on-topic and check the CMake FAQ at:
> > http://www.cmake.org/Wiki/CMake_FAQ
> >
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> >