SERVER-1517 Add --heapcheck options to build

SConstruct

@@ -260,6 +260,13 @@ AddOption( "--pch",
            action="store",
            help="use precompiled headers to speed up the build (experimental)" )
 
+AddOption( "--heapcheck",
+           dest="heapcheck",
+           type="string",
+           nargs=0,
+           action="store",
+           help="link to heap-checking malloc-lib and look for memory leaks during tests")
+
 # --- environment setup ---
 
 def removeIfInList( lst , thing ):
@@ -1042,6 +1049,28 @@ def doConfigure( myenv , needPcre=True , shell=False ):
             if not found:
                 raise "can't find a static %s" % l
 
+    # 'tcmalloc' needs to be the last library linked. Please, add new libraries before this 
+    # point.
+    if ( GetOption( "heapcheck" ) is not None ) and ( not shell ):
+        if ( not debugBuild ) and ( not debugLogging ):
+            print( "--heapcheck needs --d or --dd" )
+            Exit( 1 )
+
+        if not conf.CheckCXXHeader( "google/heap-checker.h" ):
+            print( "--heapcheck neads header 'google/heap-checker.h'" )
+            Exit( 1 )
+
+        myCheckLib( "tcmalloc" , True );  # if successful, appedded 'tcmalloc' to myenv[ LIBS ]
+        myenv.Append( CPPDEFINES=[ "HEAP_CHECKING" ] )
+        myenv.Append( CPPFLAGS="-fno-omit-frame-pointer" )
+
+    # FIXME doConfigure() is being called twice, in the case of the shell. So if it is called 
+    # with shell==True, it'd be on its second call and it would need to rearrange the libraries'
+    # order. The following removes tcmalloc from the LIB's list and reinserts it at the end.
+    if ( GetOption( "heapcheck" ) is not None ) and ( shell ):
+        removeIfInList( myenv["LIBS"] , "tcmalloc" )
+        myenv.Append( LIBS="tcmalloc" )
+
     myenv.Append(LINKCOM=" $STATICFILES")
     myenv.Append(STATICFILES=staticlibfiles)