How to set library flags after source file in cmake?

Question

I'm trying to compile a project using hwloc with CMake. However, I get a ton of undefined reference errors when linking:

undefined reference to `hwloc_get_type_depth' undefined reference to `hwloc_bitmap_zero' [...]

According to this answer to a similar question the order of flags is important.

So, how can I generate a command like this in CMake? :

g++ -Wall -std=c++11 source.cpp-lhwloc

Excerpt from my CMakeLists.txt:

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=c++11 -lhwloc") set(SOURCE_FILES source.cpp) add_executable(source ${SOURCE_FILES})

Any help is greatly appreciated!

Edit: My question was proposed as a possible duplicate of this one, however the flag I wanted to add was to link against a library and not a normal compile flag as seems to be the case in the above mentioned question. @Edgar Rokyan provided the right answer for my problem.

Possible duplicate of How to add linker or compile flag in cmake file? — Alex Huszagh
– Alex Huszagh, Commented Jul 1, 2017 at 21:33
Possible duplicate of How to add "-l" (ell) compiler flag in CMake — Tsyvarev
– Tsyvarev, Commented Jul 1, 2017 at 22:09

Edgar Rokjān · Accepted Answer · 2017-07-01 21:29:10Z

If you need to link against hwloc library you might use target_link_libraries command:

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=c++11") # <== remove *-lhwloc* set(SOURCE_FILES source.cpp) add_executable(source ${SOURCE_FILES}) target_link_libraries(source hwloc) # <== add this line

Thank you very much! That fixed it. I'll accept your answer as soon as possible.

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