[GHC] #13360: Add a flag to enable inferring HasCallStack constraints

[GHC]

#13360: Add a flag to enable inferring HasCallStack constraints
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        Reporter:  gridaphobe        |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              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 bgamari):

 > And worse, there doesn't seem to be any reason to expect a size
 heuristic to produce a proper chain of callstack-aware functions.

 Ahh, yes, that's a good point. Unlike cost centers, if you miss any link
 in the chain you lose all locations "above" the missing link.

 > Well, cost-center stacks require the entire world to have been compiled
 with -prof, which can be pretty time-consuming.

 Okay, fair enough. Personally I have configured Cabal to always profiled
 libraries so the cost generally isn't so high. I suppose if you don't do
 this switching to profiling would be rather painful, however. It's a shame
 that profiled code must be so incompatible with unprofiled.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13360#comment:35>
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