Re: GHC-3.0 link error on HP
Byron Cook writes: Hi, im getting the following link error on an HP (uname -a = HP-UX dtthp237 B.10.01 A 9000/770 2009624264 two-user license) /usr/ucb/ld: (Warning) Symbols named "PerformGC_wrapper" of incompatible types (such as CODE and DATA) were found in Env.o and AbsHLSpec.o. This may not be supported in future releases. Could you compile Env.hs, AbsSpec.hs and ExceptionM.hs with -keep-s-file-too, and tar up the resulting .s files, so that we could have a look at what's coming out in the end? (No access to machines running hpux here at Glasgow.) Thanks, --Sigbjorn
GHC-3.0 link error on HP
Hi, im getting the following link error on an HP (uname -a = HP-UX dtthp237 B.10.01 A 9000/770 2009624264 two-user license) /usr/ucb/ld: (Warning) Symbols named "PerformGC_wrapper" of incompatible types (such as CODE and DATA) were found in Env.o and AbsHLSpec.o. This may not be supported in future releases. /usr/ucb/ld: (Warning) Symbols named "PerformGC_wrapper" of incompatible types (such as CODE and DATA) were found in ExceptionM.o and Env.o. This may not be supported in future releases. /usr/ucb/ld: (Warning) Symbols named "PerformGC_wrapper" of incompatible types (such as CODE and DATA) were found in NameM.o and Env.o. This may not be supported in future releases. /usr/ucb/ld: (Warning) Symbols named "PerformGC_wrapper" of incompatible types (such as CODE and DATA) were found in ParseL.o and Env.o. This may not be supported in future releases. /usr/ucb/ld: (Warning) Symbols named "PerformGC_wrapper" of incompatible types (such as CODE and DATA) were found in Parser.o and Env.o. This may not be supported in future releases. /usr/ucb/ld: (Warning) Symbols named "PerformGC_wrapper" of incompatible types (such as CODE and DATA) were found in PrettyL.o and Env.o. This may not be supported in future releases. /usr/ucb/ld: (Warning) Symbols named "Ind_info" of incompatible types (such as CODE and DATA) were found in /idl/strategic/fv2/hlspec/ghc-3.0/lib/ghc-3.00/libHS.a(PrelBase__3.o) and AbsSpec.o. This may not be supported in future releases. /usr/ucb/ld: Unsatisfied symbols: PerformGC_wrapper (data) Ind_info (data) collect2: ld returned 1 exit status when i try to link ghc .o files with the command: ghc -o prog *.o any suggestions?
Re: Confusing error message
I encountered a confusing error message, which you can reproduce with type P a = Maybe a instance Monad P where (=) = error "foo" return = error "bar" I get bug.hs:5: `P' should have 1 argument, but has been given 0 . Would it be better if it said Type synonym constructor P should have 1 argument, but has been given 0 Haskell requires that type synonyms are never partially applied; that's what's being complained about here. If you did fully apply it, GHC 3.1 (without -fglasow-exts) would then complain about making an instance of a type synonym. At the moment, though, it trips over the mal-formed type expression first. That's what I guessed, but I reckon that it may be a bit difficult to spot for people who are not so familiar with the details of constructor classes. But, maybe it is too much fuzz to check for this special situation explicitly. I wonder whether it would be helpful to add a comment like (or if this is a instance declaration, type synonyms are not allowed) to the message. Manuel
