[CMake] How to use DEFINE_SYMBOL properly?

[Pau Garcia i Quiles]

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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-- 
Pau Garcia i Quiles
http://www.elpauer.org
(Due to my workload, I may need 10 days to answer)