Replace pthread and dl linking with cmake-based variables

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit a6a56789c9)

CMakeLists.txt

@@ -27,6 +27,7 @@ set( PACKAGE_VERSION 0.7.0 )
 ##### include essential cmake modules ###########
 
 include( FindPkgConfig )
+include( FindThreads )
 include( CheckIncludeFile )
 include( CheckFunctionExists )
 include( CheckLibraryExists )
@@ -106,17 +107,6 @@ if( WITH_GTK )
     endif( )
 endif( WITH_GTK )
 
-set( DL_LIBRARIES dl )
-check_library_exists( ${DL_LIBRARIES} dlopen /lib HAVE_LIBDL )
-if( NOT HAVE_LIBDL )
-  unset( DL_LIBRARIES )
-  check_function_exists( dlopen HAVE_DLOPEN )
-  if( HAVE_DLOPEN )
-    set( HAVE_LIBDL 1 )
-  endif( HAVE_DLOPEN )
-endif( NOT HAVE_LIBDL )
-
-set( EXTRA_LIBRARIES "-lm -lpthread" )
 if( UNIX )
   set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden" )
 endif( UNIX )

src/CMakeLists.txt

@@ -45,7 +45,7 @@ tde_add_library(
   ${target} SHARED
   VERSION 1.0.0
   SOURCES ${${target}_SRCS}
-  LINK ${BACKEND_LIBRARIES} ${ZLIB_LIBRARIES} ${DL_LIBRARIES} ${EXTRA_LIBRARIES}
+  LINK ${BACKEND_LIBRARIES} ${ZLIB_LIBRARIES} ${CMAKE_DL_LIBS} m ${CMAKE_THREAD_LIBS_INIT}
   DESTINATION ${LIB_INSTALL_DIR}
 )
 
@@ -53,7 +53,7 @@ tde_add_library(
   ${target} STATIC_PIC
   VERSION 1.0.0
   SOURCES ${${target}_SRCS}
-  LINK ${BACKEND_LIBRARIES} ${ZLIB_LIBRARIES} ${EXTRA_LIBRARIES}
+  LINK ${BACKEND_LIBRARIES} ${ZLIB_LIBRARIES} m ${CMAKE_THREAD_LIBS_INIT}
   DESTINATION ${LIB_INSTALL_DIR}
 )