#4867: ghci displays negative floats incorrectly (was: Incorrect result from
trig
functions)
-------------------------------+--------------------------------------------
Reporter: gwright | Owner: gwright
Type: bug | Status: new
Priority: high | Milestone: 7.0.2
Component: GHCi | Version: 7.0.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: MacOS X | Blocking:
Architecture: x86_64 (amd64) | Failure: Incorrect result at runtime
-------------------------------+--------------------------------------------
Comment(by gwright):
I was half right: rather than being missing, another piece of the OS X 64
bit linker was just sketched in. This code incorrectly calculated some of
the less common relocations. The fix was just to replace the erroneous
code with a call to `relocateAddress`.
Here's what happens now:
{{{
gwright-macbook> inplace/bin/ghc-stage2 --interactive
GHCi, version 7.0.1.20101221: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Loading package ffi-1.0 ... linking ... done.
Prelude> -1.0
--1.0
Prelude>
}}}
I don't yet understand the double minus sign in the result. It's probably
caused by the messing about I did with `Float.lhs` when trying to track
down the bug. I hope there isn't another real bug here, but you never
know.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4867#comment:25>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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