odd error message when building with ghc 7.8

[cartazio]

carter llvm-general/llvm-general ‹llvm-3.4› » cabal configure                                                 1 ↵
Resolving dependencies...
cabal: The package 'llvm-general' requires Cabal library version 1.18.0 but no
suitable version is installed.

i have cabal 1.18.1.3 installed.. :(

[cartazio]

i then tried building the setup.hs and running it and i get this gem (i have all of these libs installed, but it says otherwise)

carter llvm-general/llvm-general ‹llvm-3.4*› » ./Setup configure           
Configuring llvm-general-3.4.0.0...
Setup: At least the following dependencies are missing:
llvm-general-pure ==3.4.0.0,
mtl >=2.0.1.0,
parsec >=3.1.3,
setenv >=0.1.0,
utf8-string >=0.3.7

[bscarlet]

Is ghc 7.8 released? I don't see it on ghc.hackage.org.

[cartazio]

7.8 is in RC. (and i have my own wee build). So i'm doing a semi annual "try building everything"

Oddly, i can cabal install llvm-general -fshared-llvm --ghc-options="-pgmc clang -pgma clang -XRankNTypes -XImpredicativeTypes" (nb: not sure if the pgmc / pgma bits are needed, that was cargoculting on my part) from hackage, but I can't cabal install/build in the git repo for 3.4 (theres some other issues that resolves, creates etc, i'll file those tickets suitable)

[cartazio]

the point being: i seem to be able to run cabal build on the sdists from hackage, but not directly on the subdirectorys in the git repo

[bscarlet]

Well, that's quite peculiar, but suggests something's weird about your environment. I'm not going to be able get into playing with 7.8 before it's released, so I can't do much right now. If you work out more of what's going on, do let me know.

[cartazio]

yes, i have NO CLUE whats going on wrt the git repo issue. (and needless to say, i'm not exactly pleased :) )

[bscarlet]

Well, the git repo contains two packages, llvm-general-pure and llvm-general. Are you installing llvm-general-pure first?

When I build, I coordinate building the two using the Shake.hs script, which uses cabal-dev. (I haven't switched to cabal sandboxes yet).

You might try "runhaskell Shake.hs" from the root directory of the git repo. The default shake target will build the two packages into a cabal-dev sandbox in the same directory, and run the tests. If that works you have a simple problem, if it doesn't then you have a messy one.

[cartazio]

hrmmmm... I was doing a cd llvm-general-pure ; cabal install ; cd .. ; cd llvm-general ; cabal install with no sandboxes. I'll try with sandboxing andor the shake script

[bscarlet]

Um... None of the commands you list is the "cabal configure" command you originally said caused the error. Please give a more literal and detailed sequence of commands and errors, preferably running only one command at a time.

[cartazio]

oh ok. i'll do a more detailed repro tomorrow. (was just giving another way to do the repro)

[cartazio]

ryan newton hit a related problem https://github.com/haskell/cabal/issues/1666 (well the same one)

[cartazio]

ok, this problem seems to be gone with the current RC (though still the -fshared-llvm + using libc++ rather than libstdc++ stuff)