Hello,
svn fpc r31922 lazarus r49919 qtx64 osx 10.11(el capitan) xcode 7.0.1

Copyright (c) 1993-2015 by Florian Klaempfl and others /opt/lazarus/ide/advancedipc.pp(227,49) Error: (3284) Operator is not overloaded: "Int64" xor "TThreadID"
advancedipc.pp(688) Fatal: (10026) There were 1 errors compiling module, stopping
Fatal: (1018) Compilation aborted
make[2]: *** [lazarus] Error 1
make[1]: *** [ide] Error 2
make: *** [ide] Error 2

Please test the attached patch.

Ondrej
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Index: ide/advancedipc.pp
===================================================================
--- ide/advancedipc.pp	(revision 49918)
+++ ide/advancedipc.pp	(working copy)
@@ -224,7 +224,7 @@
   repeat
     //if Randomize/Random is started from 2 processes at exactly same moment, it returns the same number! -> prevent duplicates by xor GetCurrentThreadId
     //the result must be of range 0..$7FFFFFFF (High(Integer))
-    Result := Integer((Int64(Random($7FFFFFFF)) xor GetCurrentThreadId) and $7FFFFFFF);
+    Result := Integer((PtrInt(Random($7FFFFFFF)) xor PtrInt(GetCurrentThreadId)) and $7FFFFFFF);
     outFileName := GetRequestFileName(Result);
   until not RequestExists(outFileName);
 end;
Index: ide/ideinstances.pas
===================================================================
--- ide/ideinstances.pas	(revision 49918)
+++ ide/ideinstances.pas	(working copy)
@@ -501,7 +501,7 @@
         {$IFNDEF MSWINDOWS}
         //this code is not slowing up IDE start because if there was highest client found (the normal way), we close anyway
         Randomize;  //random sleep in order to prevent double file locks on unix
-        Sleep(Random( PtrInt(($3F+GetCurrentThreadId) and $3F) ));
+        Sleep((PtrInt(Random($3F)) + PtrInt(GetCurrentThreadId)) and $3F);
         {$ENDIF}
         if not (xServer.StartServer(False) and (xServer.GetPendingRequestCount > 0)) then
           Exit;//server is already running or there are no pending message -> close

Thank you Ondrej,
This patch fixed this problem. Is this patch apply to Trunk? Thank you

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FreeMan wrote

Thank you Ondrej, This patch fixed this problem. Is this patch apply to Trunk? Thank you

Yes. I assume Juha or Mattias apply it at some point. Ondrej
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Thanks. Applied.

Mattias