CMake and pugixml

Question

I am new to CMake and having trouble understanding how to use it.

I have a cross-platform c++ project. It builds using CMake and my CMakeLists.txt lives in a folder called MyProject along with the project. I checked out a pugixml git submodule and it now lives under MyProject/pugixml, with its sources being under MyProject/pugixml/src. It however has its own CMake file: MyProject/pugixml/CMakeLists.txt.

How do I modify my CMakeLists.txt to also build and use pugixml? I tried something like

include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${GENERATED_HEADER_OUTPUT_DIRECTORY} pugixml/src)

and

add_library(PugiXML deps/pugixml/src/pugiconfig.hpp deps/pugixml/src/pugixml.cpp deps/pugixml/src/pugixml.hpp)

and

add_subdirectory(pugixml) in different combinations (these are examples I found on Github), but it doesn't work - I get unresolved external symbol errors, so I assume the cpp never got compiled.

I get "unresolved external symbol" errors - This means you need to link with a library. add_subdirectory(pugixml) just builds external library, but linking with it should be performed explicitely with target_link_libraries. — Tsyvarev
– Tsyvarev, Commented Jan 12, 2018 at 7:43
Also, consider using the more modern target_include_directories instead of the old include_directories. — ComicSansMS
– ComicSansMS, Commented Jan 12, 2018 at 8:05

Nibor · Accepted Answer · 2018-01-20 18:50:00Z

0

Try this:

add_subdirectory(pugixml)
target_link_libraries(MyProject PugiXML)

assuming PugiXML is the target name that is exposed by the CMake files in /pugixml.

answered Jan 20, 2018 at 18:50

Nibor

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