I'm on Mac OS 10.4.2, using ghc 6.4 (from the haskell.org .dmg) and
gcc 4.0.0. Other wxHaskell programs (the samples and my own
experiments) compile without tripping over this.
GHC 6.4 is incompatible with gcc 4.0.0 when -O or -via-C is used.
You can work around this problem by either not using -via-C and
always adding -fasm *after* -O, or by setting your default compiler
to gcc-3.3 using
sudo gcc_select 3.3
... but be aware that this also affects other C compilations; switch
back using
sudo gcc_select 4.0
I suspect that you compiled the program with -O before, and then
switched to -O0 without removing your .o files. If you compiled
wxHaskell yourself, then the problem might also be in wxHaskell
(you'd have to recompile it then).
The upcoming GHC 6.4.1 will of course fix this problem.
Cheers,
Wolfgang
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