cmake: Avoid uneeded linking/unused libraries in some dwarves librari…

…es and executables

currently mandriva has a packaging script which checks for uneeded linking in
package built files. For dwarves, it displays:

Warning: unused libraries in /usr/lib64/libdwarves_reorganize.so.1.0.0: libdw.so.1
 libelf.so.1
 libz.so.1

Warning: unused libraries in /usr/lib64/libdwarves_emit.so.1.0.0: libdw.so.1
 libelf.so.1
 libz.so.1

Warning: unused libraries in /usr/bin/ctracer: libz.so.1
 libdw.so.1

Warning: unused libraries in /usr/bin/syscse: libdw.so.1
 libelf.so.1
 libz.so.1

Warning: unused libraries in /usr/bin/pglobal: libdw.so.1
 libelf.so.1
 libz.so.1

Warning: unused libraries in /usr/bin/pdwtags: libdw.so.1
 libelf.so.1
 libz.so.1

Warning: unused libraries in /usr/bin/prefcnt: libdw.so.1
 libelf.so.1
 libz.so.1

Warning: unused libraries in /usr/bin/pfunct: libz.so.1
 libdw.so.1

Warning: unused libraries in /usr/bin/pahole: libz.so.1
 libdw.so.1
 libelf.so.1

Warning: unused libraries in /usr/bin/dtagnames: libdw.so.1
 libelf.so.1
 libz.so.1

Warning: unused libraries in /usr/bin/codiff: libdw.so.1
 libelf.so.1
 libz.so.1

The patch below fixes the issue (removing uneeded specified libraries and using
LINK_INTERFACE_LIBRARIES property, see
http://www.cmake.org/Wiki/CMake_FAQ#Why_are_libraries_linked_to_my_shared_library_included_when_something_links_to_it.3F)

Signed-off-by: Herton Ronaldo Krzesinski <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

CMakeLists.txt

@@ -38,17 +38,18 @@ set(dwarves_LIB_SRCS dwarves.c dwarves_fprintf.c gobuffer strings
 		     dutil.c elf_symtab.c rbtree.c)
 add_library(dwarves SHARED ${dwarves_LIB_SRCS})
 set_target_properties(dwarves PROPERTIES VERSION 1.0.0 SOVERSION 1)
+set_target_properties(dwarves PROPERTIES LINK_INTERFACE_LIBRARIES "")
 target_link_libraries(dwarves ${DWARF_LIBRARIES} ${ZLIB_LIBRARIES})
 
 set(dwarves_emit_LIB_SRCS dwarves_emit.c)
 add_library(dwarves_emit SHARED ${dwarves_emit_LIB_SRCS})
 set_target_properties(dwarves_emit PROPERTIES VERSION 1.0.0 SOVERSION 1)
-target_link_libraries(dwarves_emit ${DWARF_LIBRARIES} dwarves)
+target_link_libraries(dwarves_emit dwarves)
 
 set(dwarves_reorganize_LIB_SRCS dwarves_reorganize.c)
 add_library(dwarves_reorganize SHARED ${dwarves_reorganize_LIB_SRCS})
 set_target_properties(dwarves_reorganize PROPERTIES VERSION 1.0.0 SOVERSION 1)
-target_link_libraries(dwarves_reorganize ${DWARF_LIBRARIES} dwarves)
+target_link_libraries(dwarves_reorganize dwarves)
 
 set(codiff_SRCS codiff.c)
 add_executable(codiff ${codiff_SRCS})