ghc

I would like to generate an .hi interface file and only that (no object file, no code generation at all). I tried ghc -fno-code -ohi out.hi myfile.hs and get ghc: -ohi can only be used when compiling a single source file which I don't understand since I have only given a single source file. Around 2014, there was an option added to GHC specifically for this. Now, you can invoke: ghc -fno-code -fwrite-interface ... It actually speeds up compilation by about a quarter in some cases. Use -c option, or else ghc wants to link, not just to compile: ghc -fno-code -ohi out.hi -c myfile.hs UPDATE: but

Specs GHC 6.12.1 Mac OS X 10.6.4 x64 MacBook Pro Problem I'm having trouble using let syntax. The following code refuses to compile: module Main where main = let x = 1 y = 2 z = 3 in putStrLn $ "X = " ++ show x ++ "\nY = " ++ show y ++ "\nZ = " ++ show z I tried tabbing in y = 2 and z = 3 even more. No dice. (Undesirable) Solutions The only way I've gotten the code to compile is either Replacing hard tabs with spaces. Replacing the let clause with a where clause. Saizan on #haskell explains that the assignments in a let expression have to align, not let itself. As long as the assignments line

I'm trying to compile the following code with GHC: module Test where import Maybe import Prelude hiding (null) import System.IO null = () main :: IO () main = putStrLn "Hello, world!" If I just run ghc Test.hs , I get: Could not find module `Maybe' It is a member of the hidden package `haskell98-2.0.0.1'. So I try ghc -package haskell98 Test.hs : Ambiguous module name `Prelude': it was found in multiple packages: base haskell98-2.0.0.1 It doesn't seem right, but I try ghc -package haskell98 -hide-package base Test.hs : Could not find module `System.IO' It is a member of the hidden package

Is there any way to produce stand alone haskell executable to run on different linux machines assuming the architecture is similar? Sorry I should have been clearer. The other machines might not have ghc installed on them - a bit like pyinstaller for python is what I was looking for? You can use the flags -static -optl-pthread -optl-static to avoid dynamically linked dependencies when compiling a Haskell project. This should help you run the compiled executable on two linux machines that do not have the exact same library versions. Yes it is possible. Just like with gcc-produced binaries, you

According to the GHC docs : ...GHC will only inline the function if it is fully applied, where "fully applied" means applied to as many arguments as appear (syntactically) on the LHS of the function definition. Where the example given is two semantically-equivalent definitions: comp1 :: (b -> c) -> (a -> b) -> a -> c {-# INLINE comp1 #-} comp1 f g = \x -> f (g x) comp2 :: (b -> c) -> (a -> b) -> a -> c {-# INLINE comp2 #-} comp2 f g x = f (g x) My questions: Is it only in the presence of INLINE pragmas that we get this strict behavior (i.e. strict syntactic view of LHS, RHS inlined w/out

I'm trying to install GHC with -fPIC support in Fedora. I've grabbed a source tarball since it seems no binary one has this. In Build.mk i've changed the quick build type to ifeq "$(BuildFlavour)" "quick" SRC_HC_OPTS = -H64m -O0 -fasm -fPIC GhcStage1HcOpts = -O -fasm -fPIC GhcStage2HcOpts = -O0 -fasm -fPIC GhcLibHcOpts = -O -fasm -fPIC SplitObjs = NO HADDOCK_DOCS = NO BUILD_DOCBOOK_HTML = NO BUILD_DOCBOOK_PS = NO BUILD_DOCBOOK_PDF = NO endif unfortunately, when compiling i still get the ld error ghc -fglasgow-exts --make -shared -oHs2lib.a /tmp/Hs2lib924498/Hs2lib.hs dllmain.o -static -fno