#4867: ghci displays negative floats incorrectly (was: Incorrect result from
trig
functions)
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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
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Comment(by gwright):
The memory images are aligned properly. This isn't surprising, since the
linker is using `mmap` and `mmap` aligns on 16 byte boundaries, which is
the most restrictive that the linker requires.
I think the misalignment comes from the way I use the `relocateAddress`
function. A perusal of my favorite bedtime reading, Apple's "ABI Mach-O
File Format Reference", tells me that for non-external relocations, the
`r_symbolnum` field of the `reloc` structure is used as index to the
target section. (A potential gotcha is that the `r_symbolnum` field counts
sections from 1 while the linker counts sections from 0. The code must
have been written by a frustrated `FORTRAN` programmer.) I'm testing now
what I think should be the correct relocation calculation using the target
section information.
I'll do a fresh pull, make a minimal patch and run the whole test suite
once this works.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4867#comment:47>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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