[CMake] How to link shared lib on windows (visual studio 2014).

[J Decker]

Add __declspec(dllexport) before void HelloFunc()
On Apr 25, 2016 6:01 PM, "Chaos Zhang" <zcsd2012 at gmail.com> wrote:

> Hi,
>
> I faced this problem when i try built a shared lib  and linked it on
> windows. The structure of my project as below:
> -test_dir/
>      -sub_hello/
>            CMakeLists.txt
>            hello.c
>      -top/
>            main.c
>            CMakeLists.txt
>      CMakeLists.txt
>
> The content of each file:
> ①test_dir/CMakeLists.txt:
> PROJECT(TESTLIB)
> add_subdirectory(sub_hello sub_hello)
> add_subdirectory(top top)
>
> ②test_dir/sub_hello/CMakeLists.txt:
> message("message from sub_hello")
> add_library(hello_lib  SHARED hello.c)
>
> ③test_dir/top/CMakeLists.txt:
> include_directories(../sub_hello)
> add_executable(main main.c)
> target_link_libraries(main hello_lib)
>
> ④test_dir/sub_hello/hello.c：
> #include <stdio.h>
> void HelloFunc()
> {
>         printf("###hello###\n");
> }
>
> ⑤test_dir/top/main.c:
> int main()
> {
>         HelloFunc();
>         return 0;
> }
>
> After i cmake this project, generated .sln and .proj files, then i built it
> and i get an error in vs:
>
> Error   LNK1104 can't open file "..\sub_hello\Debug\hello_lib.lib"
>
> In folder ..\sub_hello\Debug\ , there was not a hello_lib.lib existed.
> Then i look thorough and found a solution:
>
> Add "set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS YES)" in file
> test_dir/sub_hello/hello.c
>
> Then i built this solution again, this time it success, and hello_lib.lib
> and main.exe was generated. But when i try to run main.exe, an error
> occured: "lose hello_lib.dll". And i moved hello_lib.dll into the folder of
> main.exe, and it worked well.
>
> There are two questions i could not figure out:
> ①Is this "..\sub_hello\Debug\hello_lib.lib" associates with
> "..\sub_hello\Debug\hello_lib.dll"? For windows can not use .dll directly,
> and use a .lib to record the .dll's  entrance and location.
> ②How to solve the problem of main.exe can not find .dll file.
>
> Best regards,
> Chao Zhang
>
>
>
>
>
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