[GHC] #7478: setSessionDynFlags does not always work

[GHC]

#7478: setSessionDynFlags does not always work
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        Reporter:  edsko             |            Owner:
            Type:  bug               |           Status:  new
        Priority:  highest           |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:  ghc-api/T7478     |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by MikolajKonarski):

 BTW, right now (I don't know how it was before) calling
 `setSessionDynFlags` causes significant memory leaks, visible already in
 tests with a couple hundred modules and calls. If anybody is interested, I
 can try to extract a test from my code that uses GHC API, but it's GHC
 version dependent, etc., so I'd rather not do it until anybody is actively
 looking at this. But it's straightforward: basically, in a loop:

 {{{
 setSessionDynFlags flags
 setTargets yetAnotherSIngleModule
 load LoadAllTargets
 }}}



 Even if we load 100 of modules and then just keep reloading the same
 module, memory will increase all the time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7478#comment:11>
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