On 12/06/2011 10:42 AM, Totte Karlsson wrote: > Thanks for feedback >> >> You misunderstand and misuse the DEFINE_SYMBOL property. All the >> IMPORT_X_DLL symbols are wrong, you have to remove them. > > But when building the B, and C dll the import symbols need to be defined > somehow. See my export/import header below.
Well, then just use add_definitions(-DIMPORT_X_DLL). If -DEXPORT_X_DLL is present, it will override your export/import header definitions for the import case, and everything should be fine. > > CMake will only >> add the DEFINE_SYMBOL when *building* the specified target, and >> otherwise just leave it away. > Not sure I understand. > When CMake invokes the compiler to *build* the DLL it adds -DEXPORT_X_DLL. If the DLL is being *used* it doesn't do anything. > >> So, in your code you do something like this: >> >> #ifdef EXPORT_A_DLL >> #define A_API __declspec(dllexport) >> #else >> #define A_API __declspec(dllimport) >> #endif >> > I'll try to see if that works. Right now I do have an exporter/importer > header and it is more complex and looks like (for a target "COMMON"): > #if defined(EXPORT_COMMON_DLL) > #define MTK_COMMON __declspec(dllexport) > #elif defined(IMPORT_COMMON_DLL) > #define MTK_COMMON __declspec(dllimport) > #elif defined(EXPORT_COMMON_PKG) > #define MTK_COMMON __declspec(package) > #elif defined(IMPORT_COMMON_PKG) > #define MTK_COMMON __declspec(package) > #else > #define MTK_COMMON > #endif Is this for embarcadero c++? in which case do you define EXPORT_COMMON_DLL, and when do you use EXPORT_COMMON_PKG? > > Is the problem perhaps that the EXPORT_COMMON_DLL defined symbol is not > "undeffed" so when the B DLL need to Import from A, it can't? If you are referring to your original code, that was completely broken. As I explained above, if you have a structure like this add_library(A SHARED a.cpp) add_library(B SHARED b.cpp) target_link_libraries(B A) the following will happen: - A.cpp is compiled with -DA_EXPORTS. The DEFINE_SYMBOL property for target B is ignored. - DLL A is created - B.cpp is compiled with -DB_EXPORTS. The DEFINE_SYMBOL property for target A is ignored. - DLL B is created and linked against A To help you more, I would need to understand __declspec(package). The Embarcadero docs didn't really help me grasp its use... Michael -- 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 Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
