Nikita Karetnikov <[email protected]> skribis: >> I don’t know GHC, but apparently it can be bootstrapped from >> intermediate generated C files: > >> http://www.haskell.org/ghc/docs/6.4.1/html/building/sec-porting-ghc.html > >> Wouldn’t that be better than fiddling with binaries out-of-band? > > The recent versions of the compiler don’t support this. So you have to > use the old version. I’ve spent four hours on this and didn’t even get > to the intermediate C files (that’s the first step). The compiler > depends on the old libraries, so you have to downgrade. That’s the main > difficulty. > > Also, you can’t build GHC 7.6.3 using GHC 6.4.1. Users would have to > build several compilers any time they want the latest version. That may > take more than six hours (or even longer) on an average machine. > > So I’d prefer to avoid this if it’s possible.
Blech. I find it worrisome if GHC doesn’t have a better bootstrapping story. How do they port it then? >>> 1. We’d have to host the binaries (step 2) somewhere and repeat the >>> process whenever the hash of ‘/bin/sh’ changes. How often will this >>> happen? > >> The hash of /bin/sh? Where did you see /bin/sh? :-) > > I meant this one: > > scheme@(guile-user)> ,use (guix build utils) > scheme@(guile-user)> (which "sh") > $1 = "/nix/var/nix/profiles/default/guix-profile/bin/sh" > scheme@(guile-user)> (readlink $1) > $2 = "/nix/store/fzcdfwyyin5dr7finlaq2kph396nrlli-bash-4.2/bin/sh" > > How often may the hash change? In other words, what does Bash use to > “source” the hash function? Will it happen whenever you merge > ‘core-updates’? Yes. (The hash in the store file name is the hash of all the inputs that led to that directory (info "(guix) Introduction").) >> The ‘uri’ argument can be a list: > >> (origin >> (method url-fetch) >> (uri (list "http://..."; "file://...")) >> (sha256 ...)) > >> However, ‘url-fetch’ doesn’t support file://. > >> The other option would be to allow ‘source’ to be a list; that’s easily >> implemented, just not done yet. > > Thanks, I’ll look into it. Great, thanks. Ludo’.
