#2830: undefined reference to `base_DataziTuple_Z63T_con_info' when using
instances with context
--------------------+-------------------------------------------------------
Reporter: nomeata | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.2 | Severity: normal
Keywords: | Testcase:
Os: Linux | Architecture: x86
--------------------+-------------------------------------------------------
Hi,
I came across this bug when using HAppS, but it is not related to HAppS,
it seems.
I have attached the files test4.hs and test5. They differ only in that the
former one uses
{{{
instance (Serialize Method1) => UpdateEvent Method1 ()
}}}
while the second use uses
{{{
instance UpdateEvent Method1 ()
}}}
I can not tell any difference in the effect (in my real app, the example
file does not have any senisble meaning), but that’s not the point: I can
compile test5.hs without problems, but
{{{
$ ghc --make test4.hs
[1 of 1] Compiling Main ( test4.hs, test4.o )
Linking test4 ...
test4.o: In function `r1c1_info':
(.text+0x639): undefined reference to `base_DataziTuple_Z63T_con_info'
collect2: ld returned 1 exit status
}}}
It seems that ghc internally creates a large tuple (63 elements) with the
Serialize instances – or something. The dumped core has some clues, I just
can’t read them.
Sorry for not testing this with a more up-to-date compiler, but I don’t
have one handy.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2830>
GHC <http://www.haskell.org/ghc/>
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