* TObjData.symbolref: don't lose the weak binding of asm symbol. This fixes tests/tweaklib*.pp at least for Linux x86 targets with internal assembler.

* Enabled weak linking for Linux targets.

git-svn-id: trunk@21998 -

compiler/ogbase.pas

@@ -1085,17 +1085,29 @@ implementation
 
 
     function TObjData.symbolref(asmsym:TAsmSymbol):TObjSymbol;
+      var
+        s:string;
       begin
         if assigned(asmsym) then
           begin
             if not assigned(asmsym.cachedObjSymbol) then
               begin
-                result:=symbolref(asmsym.name);
+                s:=asmsym.name;
+                result:=TObjSymbol(FObjSymbolList.Find(s));
+                if result=nil then
+                  begin
+                    result:=TObjSymbol.Create(FObjSymbolList,s);
+                    if asmsym.bind=AB_WEAK_EXTERNAL then
+                      result.bind:=AB_WEAK_EXTERNAL;
+                  end;
                 asmsym.cachedObjSymbol:=result;
                 FCachedAsmSymbolList.add(asmsym);
               end
             else
               result:=TObjSymbol(asmsym.cachedObjSymbol);
+            { The weak bit could have been removed from asmsym. }
+            if (asmsym.bind=AB_EXTERNAL) and (result.bind=AB_WEAK_EXTERNAL) then
+              result.bind:=AB_EXTERNAL;
           end
         else
           result:=nil;

compiler/systems.pas

@@ -297,7 +297,7 @@ interface
                                          system_ia64_win64]+systems_linux;
 
        { all systems for which weak linking has been tested/is supported }
-       systems_weak_linking = systems_darwin + systems_solaris;
+       systems_weak_linking = systems_darwin + systems_solaris + systems_linux;
 
        systems_internal_sysinit = [system_i386_linux,system_i386_win32];