I have a library target defined as
add_library(mylib_core
core_source1.cpp
core_source2.cpp
core_source3.cpp
)
if(UNIX)
target_sources(mylib_core PUBLIC
${CMAKE_CURRENT_SOURCE_DIR}/core_source4.cpp
${CMAKE_CURRENT_SOURCE_DIR}/core_source5.cpp
)
endif()
Then a target that uses it as a dependency:
add_library(mylib_thing
thing_source1.cpp
thing_source2.cpp
thing_source3.cpp
)
target_link_libraries(mylib_thing
PUBLIC
mylib_core
)
When building with static libs, I noticed that the sources defined on
mylib_core with target_sources are building twice.
[ 60%] Building CXX object
mylib_thing/CMakeFiles/mylib_thing.dir/thing_source1.cpp.o
[ 60%] Building CXX object
mylib_thing/CMakeFiles/mylib_thing.dir/thing_source2.cpp.o
[ 60%] Building CXX object
mylib_thing/CMakeFiles/mylib_thing.dir/thing_source3.cpp.o
[ 60%] Building CXX object
mylib_thing/CMakeFiles/mylib_thing.dir/__/mylib_core/core_source4.cpp.o
[ 60%] Building CXX object
mylib_thing/CMakeFiles/mylib_thing.dir/__/mylib_core/core_source5.cpp.o
The last two source files were already built when mylib_core was built.
Why are they being built again under mylib_thing? When these files were
defined in the add_library() call, this didn't happen. Any thoughts? Is
it related to the PUBLIC v. PRIVATE enum? If so, what is the setting on
sources when defining them via add_library()?
thanks,
wes
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