cmake: add logging

cmake/Modules/FindLog4cpp.cmake

@@ -0,0 +1,53 @@
+# - Find Log4cpp
+# Find the native LOG4CPP includes and library
+#
+#  LOG4CPP_INCLUDE_DIR - where to find LOG4CPP.h, etc.
+#  LOG4CPP_LIBRARIES   - List of libraries when using LOG4CPP.
+#  LOG4CPP_FOUND       - True if LOG4CPP found.
+
+
+if (LOG4CPP_INCLUDE_DIR)
+  # Already in cache, be silent
+  set(LOG4CPP_FIND_QUIETLY TRUE)
+endif ()
+
+find_path(LOG4CPP_INCLUDE_DIR log4cpp/Category.hh
+  /opt/local/include
+  /usr/local/include
+  /usr/include
+)
+
+set(LOG4CPP_NAMES log4cpp)
+find_library(LOG4CPP_LIBRARY
+  NAMES ${LOG4CPP_NAMES}
+  PATHS /usr/lib /usr/local/lib /opt/local/lib
+)
+
+
+if (LOG4CPP_INCLUDE_DIR AND LOG4CPP_LIBRARY)
+  set(LOG4CPP_FOUND TRUE)
+  set(LOG4CPP_LIBRARIES ${LOG4CPP_LIBRARY} CACHE INTERNAL "" FORCE)
+  set(LOG4CPP_INCLUDE_DIRS ${LOG4CPP_INCLUDE_DIR} CACHE INTERNAL "" FORCE)
+else ()
+  set(LOG4CPP_FOUND FALSE CACHE INTERNAL "" FORCE)
+  set(LOG4CPP_LIBRARY "" CACHE INTERNAL "" FORCE)
+  set(LOG4CPP_LIBRARIES "" CACHE INTERNAL "" FORCE)
+  set(LOG4CPP_INCLUDE_DIR "" CACHE INTERNAL "" FORCE)
+  set(LOG4CPP_INCLUDE_DIRS "" CACHE INTERNAL "" FORCE)
+endif ()
+
+if (LOG4CPP_FOUND)
+  if (NOT LOG4CPP_FIND_QUIETLY)
+    message(STATUS "Found LOG4CPP: ${LOG4CPP_LIBRARIES}")
+  endif ()
+else ()
+  if (LOG4CPP_FIND_REQUIRED)
+    message(STATUS "Looked for LOG4CPP libraries named ${LOG4CPPS_NAMES}.")
+    message(FATAL_ERROR "Could NOT find LOG4CPP library")
+  endif ()
+endif ()
+
+mark_as_advanced(
+  LOG4CPP_LIBRARIES
+  LOG4CPP_INCLUDE_DIRS
+)