cmake doesn't follow its own advice :)
brad.king at kitware.com
Thu Jul 17 02:06:44 CEST 2008
David Faure wrote:
> Running cmake in akonadi says:
> -- Configuring done
> CMake Warning (dev) at libs/CMakeLists.txt:16 (add_library):
> Policy CMP0003 should be set before this line. Add code such as
> if(COMMAND cmake_policy)
> cmake_policy(SET CMP0003 NEW)
> endif(COMMAND cmake_policy)
> as early as possible but after the most recent call to
> cmake_minimum_required or cmake_policy(VERSION). This warning appears
> because target "akonadiprotocolinternals" links to some libraries for which
> the linker must search:
> and other libraries with known full path:
> CMake is adding directories in the second list to the linker search path in
> case they are needed to find libraries from the first list (for backwards
> compatibility with CMake 2.4). Set policy CMP0003 to OLD or NEW to enable
> or disable this behavior explicitly. Run "cmake --help-policy CMP0003" for
> more information.
> This warning is for project developers. Use -Wno-dev to suppress it.
> Obviously using a full path for libpthread would be the best solution,
> rather than hiding the warning with CMP0003.
> But this comes from cmake itself:
> FindThreads.cmake: SET(CMAKE_THREAD_LIBS_INIT "-lpthread")
> Shouldn't this look for pthread.so and set the variable to e.g. /usr/lib/libpthread.so,
> to obey the above and avoid the whole issue with -L ordering?
Where in the warning does it say that one should use a full path for
-lpthread? The fix it suggests has nothing to do with -lpthread.
CMake is warning that it is adding /usr/lib64/qt4/lib64 as a linker
search path in case it is needed to find -lpthread. In the case of
pthreads, searching for the library and providing a full path is
inappropriate because it is a system library.
The warning check should probably have a special case for known system
libraries like -lpthread and -lm, but this is not a high priority. In
the future everyone should write
and then this warning will never show up again.
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