"Failed to find interface decl for `Offside.a1'" with -O2

[Simon Peyton-Jones]

A palpable bug, thank you.   Workaround: don't use -O2 when
compiling Offside.  It'll be fixed in 5.02.2

Simon

| -----Original Message-----
| From: Ian Lynagh [mailto:igloo at earth.li] 
| Sent: 28 December 2001 23:13
| To: glasgow-haskell-bugs at haskell.org
| Subject: "Failed to find interface decl for `Offside.a1'" with -O2
| 
| 
| 
| Hi guys,
| 
| I'm afraid I haven't got a simple test case for this one.
| 
| ghc is giving me the error
|     Failed to find interface decl for `Offside.a1'
| in a rather large program. I have shown how to reproduce the 
| problem below (indenting the output). The code, compiled as 
| shown below, is at http://c93.keble.ox.ac.uk/~ian/igl-0.0.8-b1.tar.gz
| 
| $ hmake -ghc Project -package lang -O2
|     ghc  -package lang -O2   -c -o Tokens.o Tokens.lhs
|     ghc  -package lang -O2   -c -o Tree.o Tree.lhs
|     ghc  -package lang -O2   -c -o Subject.o Subject.lhs
|     ghc  -package lang -O2   -c -o PPTeX.o PPTeX.lhs
|     ghc  -package lang -O2   -c -o Position.o Position.lhs
|     ghc  -package lang -O2   -c -o Either.o Either.lhs
|     ghc  -package lang -O2   -c -o PCbase.o PCbase.lhs
|     ghc  -package lang -O2   -c -o PC.o PC.lhs
|     ghc  -package lang -O2   -c -o Parser.o Parser.lhs
|     ghc  -package lang -O2   -c -o Mangle.o Mangle.lhs
|     ghc  -package lang -O2   -c -o Sort.o Sort.lhs
|     ghc  -package lang -O2   -c -o FiniteMap.o FiniteMap.lhs
|     ghc  -package lang -O2   -c -o IA.o IA.lhs
|     ghc  -package lang -O2   -c -o Offside.o Offside.lhs
| 
|     Offside.lhs:116: Warning: Pattern match(es) are overlapped
|         In the definition of `step': step _ pos [] _ = ...
|     ghc  -package lang -O2   -c -o Scanner.o Scanner.lhs
|     ghc  -package lang -O2   -c -o Args.o Args.lhs
|     ghc  -package lang -O2   -c -o Project.o Project.lhs
| 
|     Project.lhs:4:
|         Failed to find interface decl for `Offside.a1'
|         from module `Offside'
| 
|     Project.lhs:4:
|         Failed to find interface decl for `Offside.a3'
|         from module `Offside'
| $ ghc  -package lang -O   -c -o Project.o Project.lhs
| 
|     Project.lhs:4:
|         Failed to find interface decl for `Offside.a1'
|         from module `Offside'
| 
|     Project.lhs:4:
|         Failed to find interface decl for `Offside.a3'
|         from module `Offside'
| $ ghc  -package lang   -c -o Project.o Project.lhs
| $ 
| 
| 
| Thanks
| Ian
| 
| 
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