<![CDATA[Can I create a so file for CMAKE Project, using QT?]]>using QT 5.6.3 version

NewProject -> C++Library -> Shared Library

made a project for so file and added a simple working function.

I think i followed the basic form of shared library project.

and built it, bring it to my CMAKE Project, added like below

INCLUDE_DIRECTORIES(/usr/local/include/opencv4 ./includes)

find_library(
libmy
NAMES libmy_hello.so
HINTS ./lib
REQUIRED
)
target_link_libraries(${PROJECT_NAME} ${OpenCV_LIBS1} ${OpenCV_LIBS2} ${OpenCV_LIBS3} ${OpenCV_LIBS4} ${libmy})

undefined reference to 'simple function' error occured.

I do not reckon where i did wrong...

any answer would be appriciated

]]>https://forum.qt.io/topic/143487/can-i-create-a-so-file-for-cmake-project-using-qtRSS for NodeFri, 17 Jul 2026 13:57:44 GMTWed, 08 Mar 2023 07:30:30 GMT60<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Wed, 08 Mar 2023 07:50:19 GMT]]>@manykim said in Can I create a so file for CMAKE Project, using QT?:

undefined reference to 'simple function' error occured.

Either you're not linking properly (lib not found or is not compatible), or you did not export simple_function in your lib.

]]>https://forum.qt.io/post/750343https://forum.qt.io/post/750343Wed, 08 Mar 2023 07:50:19 GMT<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Thu, 09 Mar 2023 03:13:27 GMT]]>@manykim said in Can I create a so file for CMAKE Project, using QT?:

I do not reckon where i did wrong...

Did the linker even find your my_hello library?

Post the link related commands and output executed by the Makefile that CMake generated for you.

make VERBOSE=1
]]>https://forum.qt.io/post/750477https://forum.qt.io/post/750477Thu, 09 Mar 2023 03:13:27 GMT<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Thu, 09 Mar 2023 00:00:51 GMT]]>@JoeCFD Linux, Ubuntu !! sir

]]>https://forum.qt.io/post/750469https://forum.qt.io/post/750469Thu, 09 Mar 2023 00:00:51 GMT<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Wed, 08 Mar 2023 16:03:54 GMT]]>@manykim is this on Linux or Windows?

]]>https://forum.qt.io/post/750419https://forum.qt.io/post/750419Wed, 08 Mar 2023 16:03:54 GMT<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Wed, 08 Mar 2023 08:37:16 GMT]]>@manykim said in Can I create a so file for CMAKE Project, using QT?:

link was done correctly

How can it be correct if you get "undefined reference" linker error?!

Regarding exporting symbols in libraries: please read https://doc.qt.io/qt-6/sharedlibrary.html

]]>https://forum.qt.io/post/750350https://forum.qt.io/post/750350Wed, 08 Mar 2023 08:37:16 GMT<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Wed, 08 Mar 2023 08:17:07 GMT]]>@jsulm I checked that in my qt Project the library works fine so I think export is ok... what would be my problem sir?

]]>https://forum.qt.io/post/750347https://forum.qt.io/post/750347Wed, 08 Mar 2023 08:17:07 GMT<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Wed, 08 Mar 2023 08:01:24 GMT]]>@jsulm sir please tell me more, I think, because i cannot find any special error in CMAKE project, link was done correctly... then how can I export my function? i put the macro for "Q_DECL_EXPORT" before function name in header file. was it enough? sorry for my bad language

]]>https://forum.qt.io/post/750344https://forum.qt.io/post/750344Wed, 08 Mar 2023 08:01:24 GMT<![CDATA[Reply to Can I create a so file for CMAKE Project, using QT? on Wed, 08 Mar 2023 07:50:19 GMT]]>@manykim said in Can I create a so file for CMAKE Project, using QT?:

undefined reference to 'simple function' error occured.

Either you're not linking properly (lib not found or is not compatible), or you did not export simple_function in your lib.

]]>https://forum.qt.io/post/750343https://forum.qt.io/post/750343Wed, 08 Mar 2023 07:50:19 GMT