‘sprintf’ was not declared in this scope when compiling

[lanyusea]

I'm trying to compile the code using g++
g++ -c -o main.o main.cpp
but there is a error saying
main.cpp:36:58: error: ‘sprintf’ was not declared in this scope

I'm a little confused when I include the stdio.h in main.cpp directly, there are lots of errors when compiling saying: undefined reference

any suggestion?

[delmottea]

I think it's stdio.h.
undefined reference means that you have successfully compiled the source but have problems in the linker.
Did you add the flags to link openCV? somethink like -lopencv_core,...

[lanyusea]

thanks @delmottea , you are right. I'm not quite familiar with the compile of OpenCV.

I added the CMakeLists.txt file, using TARGET_LINK_LIBRARIES( cmtcpp ${OpenCV_LIBS} ) to link the OpenCV Libaray, which works well.

and using INCLUDE_DIRECTORIES("${PROJECT_BINARY_DIR}") to link the cmt.cpp, but still get the undefined reference of CMT::

can you give me some advice?

[lanyusea]

I solved that by adding another TARGET_LINK_LIBRARIES with ${CMAKE_CURRENT_SOURCE_DIR}/CMT.cpp