[CMake] shared libraries .lib .dll

[Pierre Malarme]

hi,
i've taken your advice on the __declspec stuff and test it on a hello  
world project. i do have a .lib now but with a warning
"
hello.cxx
..\..\CMakeExample\Hello\hello.cxx(5) : warning C4273:  
'Hello::Print' : inconsistent dll linkage

h:\workspace\cmakeexample\cmakeexample\hello\hello.h(18) : see  
previous definition of 'Print'

is that normal? anyway there is a problem: the application fail to  
find the .exe and the .dll though i fixed those paths in the  
CMakeLists.txt.

what could be the problem?

thanks for help

Ingrid





2008/6/10 Martin Apel <martin.apel at simpack.de>:
Ingrid Kemgoum wrote:
hi and sorry to disturb
(i'm french and my english is not that good)
but i've seen on cmake.org <http://cmake.org> that i'm having the same  
problem as you did.

i'm building a c++ project and from a shared library i only have  
the .dll (not the .lib)
  i dont understand explanations on cmake so could you please give me  
some?
  thanks in advance and regards
  Ingrid
Hi Ingrid,

on Windows you have to tell the compiler/linker, which symbols should  
be exported from a DLL. There is a Microsoft extension to C++
using a declspec(export) and declspec(import) prefix for DLL  
functions. There's another possibility to use a so-called .def-file to  
tell the compiler,
which symbols to export. If you have not told the compiler using one  
of the two ways, no symbols are exported and thus no .lib file  
generated.
Please google for the explanation of the declspec keyword, it is  
somewhat beyond my available time to explain it in detail. What I did  
looks roughly as follows:

#ifdef WIN32
#ifdef Base_EXPORTS
#define SPCK_BASE_EXPORT __declspec(dllexport)
#else
#define SPCK_BASE_EXPORT __declspec(dllimport)
#endif
#else
#define SPCK_BASE_EXPORT
#endif

class SPCK_BASE_EXPORT Transformer
{
...
};

Hope this helps,

Martin
-- 

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