[GHC] #12664: System.Environment.withArgs and friends leak memory

[GHC]

#12664: System.Environment.withArgs and friends leak memory
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        Reporter:  simonmar          |                Owner:  niteria
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  libraries/base    |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Bartosz Nitka <niteria@…>):

 In [changeset:"e41b9c614984b63c4660018cecde682453e083e5/ghc" e41b9c6/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e41b9c614984b63c4660018cecde682453e083e5"
 Fix memory leak from #12664

 This fixes the leak with `setProgArgv`. The problem was
 that `setProgArgv` would not free the objects pointed
 to by `prog_argc`, `prog_argv` when the globals were
 changed resulting in a leak.

 The only strictly necessary change is in `rts/RtsFlags.c`, but
 the code in `System.Environment` was a bit confusing and not
 exception safe, so I refactored it.

 Test Plan: ./validate

 Reviewers: simonmar, ezyang, austin, hvr, bgamari, erikd

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2576

 GHC Trac Issues: #12664
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12664#comment:2>
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