Can I create a so file for CMAKE Project, using QT?

manykim

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

jsulm

@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.

manykim

@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

manykim

@jsulm I checked that in my qt Project the library works fine so I think export is ok... what would be my problem sir?

jsulm

@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

JoeCFD

@manykim is this on Linux or Windows?

manykim

This post is deleted!

manykim

@JoeCFD Linux, Ubuntu !! sir

ChrisW67

@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