cmake notes

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Use pkg-config in cmake

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#require gstreamer and check version, ${GST} is an user defined prefix for _LIBRARIES/_INCLUDE_DIRS/_CFLAGS_OTHER
pkg_check_modules(GST REQUIRED gstreamer-1.0>=1.10
                  gstreamer-app-1.0>=1.10)
#Then we can get hidden variables ${GST_LIBRARIES} ${GST_INCLUDE_DIRS} ${GST_CFLAGS_OTHER}
target_link_libraries(${PROJECT_NAME} boost_log pthread
                  ${GST_LIBRARIES})
target_include_directories(${PROJECT_NAME} PUBLIC ${GST_INCLUDE_DIRS})
target_compile_options(${PROJECT_NAME} PUBLIC ${GST_CFLAGS_OTHER})

Add all files under a folder(i.e. add all source files)

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#option 1: use file(), store files into variable SRC_FILES
file(GLOB SRC_FILES "*.cpp")
#if there are sub-dirs should be searched, use recursive
file(GLOB_RECURSE SRC_FILES "*.cpp")
#option 2: use aux_source_directory(), store source files into variable SRC_FILES
aux_source_directory(. SRC_FILES)