cmake: Factor out common simgear dependency libs.

Factor out and use this core simgear depenency
library cmake variable.

CMakeLists.txt

@@ -158,33 +158,6 @@ check_cxx_source_compiles(
     "
     HAVE_CULLSETTINGS_CLEAR_MASK)
 
-# library required by simgear
-# XXX This should go in a module and only run if simgear is not shared.
-
-if(HAVE_UNISTD_H)
-set(CMAKE_REQUIRED_INCLUDES ${CMAKE_INCLUDE_PATH})
-check_cxx_source_compiles(
-   "#include <unistd.h>
-    #if !defined(_POSIX_TIMERS) || (0 >= _POSIX_TIMERS)
-    #error clock_gettime is not supported
-    #endif
-
-    int main() { return 0; }
-    "
-    HAVE_CLOCK_GETTIME)    
-endif(HAVE_UNISTD_H)
-
-set(RT_LIBRARY "")
-if(HAVE_CLOCK_GETTIME)
-check_function_exists(clock_gettime CLOCK_GETTIME_IN_LIBC)
-if(NOT CLOCK_GETTIME_IN_LIBC)
-check_library_exists(rt clock_gettime "" HAVE_RT)
-if(HAVE_RT)
-set(RT_LIBRARY rt)
-endif(HAVE_RT)
-endif(NOT CLOCK_GETTIME_IN_LIBC)
-endif(HAVE_CLOCK_GETTIME)
-
 if(ENABLE_RTI)
     find_package(RTI)
     if(RTI_FOUND)
@@ -211,7 +184,6 @@ if(WIN32)
     endif(MSVC)
 
     set(NOMINMAX 1)
-    set( WINSOCK_LIBRARY "ws2_32.lib" )
 endif(WIN32)    
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS} ${MSVC_FLAGS} -D_REENTRANT")

CMakeModules/FindSimGear.cmake

@@ -63,6 +63,10 @@ FIND_LIBRARY(SIMGEAR_LIBRARIES
   /opt
 )
 
+# dependent packages
+find_package(ZLIB REQUIRED)
+find_package(Threads REQUIRED)
+
 macro(find_sg_component comp libs)
     set(compLib "sg${comp}")
     string(TOUPPER "SIMGEAR_${comp}" compLibBase)
@@ -149,6 +153,26 @@ if(${SIMGEAR_LIBRARIES} STREQUAL "SIMGEAR_LIBRARIES-NOTFOUND")
 
     # again link order matters - scene libraires depend on core ones
     list(APPEND SIMGEAR_LIBRARIES ${SIMGEAR_CORE_LIBRARIES})
+
+    set(SIMGEAR_CORE_LIBRARY_DEPENDENCIES
+        ${CMAKE_THREAD_LIBS_INIT}
+        ${ZLIB_LIBRARY})
+
+    if(WIN32)
+        list(APPEND SIMGEAR_CORE_LIBRARY_DEPENDENCIES ${WINSOCK_LIBRARY})
+    endif(WIN32)
+
+    if(NOT MSVC)
+        # basic timing routines on non windows systems, may be also cygwin?!
+        check_function_exists(clock_gettime clock_gettime_in_libc)
+        if(NOT clock_gettime_in_libc)
+            check_library_exists(rt clock_gettime "" have_rt)
+            if(have_rt)
+                list(APPEND SIMGEAR_CORE_LIBRARY_DEPENDENCIES rt)
+            endif(have_rt)
+        endif(NOT clock_gettime_in_libc)
+    endif(NOT MSVC)
+
 endif()
 
 # now we've found SimGear, check its version

src/FDM/YASim/CMakeLists.txt

@@ -38,7 +38,7 @@ add_executable(yasim yasim-test.cpp)
 target_link_libraries(yasim 
 	fgYASim
 	${SIMGEAR_CORE_LIBRARIES}
-	${ZLIB_LIBRARIES})
+        ${SIMGEAR_CORE_LIBRARY_DEPENDENCIES})
 
 install(TARGETS yasim RUNTIME DESTINATION bin)
 	

src/Input/CMakeLists.txt

@@ -31,22 +31,17 @@ set(FGJS_SOURCES
 	
 add_executable(fgjs ${FGJS_SOURCES})
 
-if(WIN32)
-   set(SOCKETS_LIBRARY wsock32.lib)
-endif(WIN32)
-
 target_link_libraries(fgjs 
     ${SIMGEAR_CORE_LIBRARIES}
-    ${SOCKETS_LIBRARY}
     ${PLIB_LIBRARIES}
-	${ZLIB_LIBRARY})
+    ${SIMGEAR_CORE_LIBRARY_DEPENDENCIES})
 
 add_executable(js_demo js_demo.cxx)
 
 target_link_libraries(js_demo 
 	${SIMGEAR_CORE_LIBRARIES}
 	${PLIB_LIBRARIES}
-	${ZLIB_LIBRARY})
+	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES})
 
 flightgear_component(Input "${SOURCES}")
 

src/Main/CMakeLists.txt

@@ -71,16 +71,15 @@ endif()
 
 target_link_libraries(fgfs
 	${FG_LIBS}
-	${HLA_LIBRARIES}
 	${SIMGEAR_LIBRARIES}
 	${OPENSCENEGRAPH_LIBRARIES}
 	${OPENAL_LIBRARY}
 	${OPENGL_LIBRARIES}
 	${ALUT_LIBRARY}
-	${ZLIB_LIBRARIES}
 	${PLIB_LIBRARIES}
 	${LIBSVN_LIBRARIES}
-	${WINSOCK_LIBRARY}
-	${RT_LIBRARY})
+	${HLA_LIBRARIES}
+	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
+)
 
 install(TARGETS fgfs RUNTIME DESTINATION bin)

utils/GPSsmooth/CMakeLists.txt

@@ -7,11 +7,8 @@ target_link_libraries(GPSsmooth
 	${SIMGEAR_CORE_LIBRARIES}
 	${PLIB_SG_LIBRARY}
 	${PLIB_UL_LIBRARY}
-	${ZLIB_LIBRARIES}
+	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 	${WINMM_LIBRARY}
-	${WINSOCK_LIBRARY}
-	${ZLIB_LIBRARIES}
-	${RT_LIBRARY}
 )
 
 target_link_libraries(MIDGsmooth
@@ -19,8 +16,7 @@ target_link_libraries(MIDGsmooth
 	${PLIB_SG_LIBRARY}
 	${PLIB_UL_LIBRARY}
 	${WINMM_LIBRARY}
-	${WINSOCK_LIBRARY}
-	${RT_LIBRARY}
+	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 )
 
 target_link_libraries(UGsmooth
@@ -28,9 +24,7 @@ target_link_libraries(UGsmooth
 	${PLIB_SG_LIBRARY}
 	${PLIB_UL_LIBRARY}
 	${WINMM_LIBRARY}
-	${WINSOCK_LIBRARY}
-	${ZLIB_LIBRARIES}
-	${RT_LIBRARY}
+	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 )
 
 install(TARGETS GPSsmooth MIDGsmooth UGsmooth RUNTIME DESTINATION bin)

utils/TerraSync/CMakeLists.txt

@@ -4,9 +4,8 @@ add_executable(terrasync terrasync.cxx)
 
 target_link_libraries(terrasync
 	${SIMGEAR_CORE_LIBRARIES}
-	${ZLIB_LIBRARIES}
-    ${WINSOCK_LIBRARY}
-    ${RT_LIBRARY})
+	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
+)
 
 if(LIBSVN_FOUND)
 	target_link_libraries(terrasync ${LIBSVN_LIBRARIES})

utils/fgadmin/src/CMakeLists.txt

@@ -7,9 +7,9 @@ add_dependencies(fgadmin FGAdminUI)
 
 target_link_libraries(fgadmin FGAdminUI
 	${SIMGEAR_LIBRARIES}
-	${ZLIB_LIBRARIES}
 	${PLIB_LIBRARIES}
 	${FLTK_LIBRARIES}
+	${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 )
 	
 install(TARGETS fgadmin RUNTIME DESTINATION bin)

utils/fgpanel/CMakeLists.txt

@@ -20,10 +20,8 @@ if(GLUT_FOUND)
 		${GLUT_LIBRARIES}
 		${SIMGEAR_CORE_LIBRARIES}
 		${OPENGL_LIBRARIES}
-		${ZLIB_LIBRARIES}
 		${PLIB_LIBRARIES}
-		${WINSOCK_LIBRARY}
-		${RT_LIBRARY}
+		${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
 		)
 
 	install(TARGETS fgpanel RUNTIME DESTINATION bin)

utils/fgviewer/CMakeLists.txt

@@ -5,8 +5,8 @@ target_link_libraries(fgviewer
 	${SIMGEAR_LIBRARIES}
 	${OPENSCENEGRAPH_LIBRARIES}
 	${OPENGL_LIBRARIES}
-	${ZLIB_LIBRARIES}
 	${PLIB_LIBRARIES}
-        ${RT_LIBRARY})
+        ${SIMGEAR_CORE_LIBRARY_DEPENDENCIES}
+)
 
 install(TARGETS fgviewer RUNTIME DESTINATION bin)