Clever Geek Handbook

Undefined reference to `shm_open 'using CMake

I am using CMake under Ubuntu 14.04 to set up my project. I need to use a third party library (say stuff.so). In CMakeLists.txt, I am using TARGET_LINK_LIBRARIES to link the material library. However, I got an error:

DIR_TO_LIB / stuff.so: -1: error: undefined reference to `shm_open '

I tried to put this flag in CMakeLists.txt but it didn't work:

set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lrt")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lrt")

A post ( link ) that says -lrt should be placed as the last argument to g ++. In my case, when using CMake, how should I do this?

UPDATE : I added

SET (CMAKE_VERBOSE_MAKEFILE 1)

and I found that -lrt is not the last one (even though I put it at the end of the target link). See link for compilation.

As you can see from the compilation output, there are several bind flags for opencv. I don't understand how this could happen when I link the OpenCV library first in TARGET_LINK_LIBRARIES. How does CMake handle this binding order?

Also see my CMakeLists.txt .

Thank.

+3


source to share


1 answer


You need to add rt

in TARGET_LINK_LIBRARIES

as the latter, for example:

TARGET_LINK_LIBRARIES(my_app ${Boost_LIBRARIES} rt)


You can check the position rt

by including verbose build output:

SET (CMAKE_VERBOSE_MAKEFILE 1)
+3


source






More articles:


All Articles