[GHC] #2169: Compilation fails first time without giving an error, later succeeds without changing code

[GHC]

#2169: Compilation fails first time without giving an error, later succeeds
without changing code
----------------------+-----------------------------------------------------
 Reporter:  nccb      |          Owner:                
     Type:  bug       |         Status:  closed        
 Priority:  normal    |      Milestone:  6.10.1        
Component:  Compiler  |        Version:  6.8.2         
 Severity:  normal    |     Resolution:  fixed         
 Keywords:            |     Difficulty:  Unknown       
 Testcase:            |   Architecture:  x86_64 (amd64)
       Os:  Linux     |  
----------------------+-----------------------------------------------------
Changes (by simonmar):

  * status:  new => closed
  * resolution:  => fixed

Comment:

 Thanks to Ian's investigations, I finally found the culprit.

 {{{
 Mon Jul  7 10:58:36 BST 2008  Simon Marlow <marlowsd at gmail.com>
   * FIX #1736, and probably #2169, #2240
   appendStringBuffer was completely bogus - the arguments to copyArray
   were the wrong way around, which meant that corruption was very likely
   to occur by overwriting the end of the buffer in the first argument.

   This definitely fixes #1736.  The other two bugs, #2169 and #2240 are
   harder to reproduce, but we can see how they could occur: in the case
   of #2169, the options parser is seeing the contents of an old buffer,
   and in the case of #2240, appendStringBuffer is corrupting an
   interface file in memory, since strng buffers and interface files are
   both allocated in the pinned region of memory.
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2169#comment:11>
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