Re: simultaneous ghc versions

On Fri, Jul 31, 2015 at 2:32 PM, Evan Laforge wrote:

On Fri, Jul 31, 2015 at 11:26 AM, Herbert Valerio Riedel wrote:

...

Btw, I simply prepend to the $PATH env variable, or pass the appropriate executable name to `cabal`'s

-w --with-compiler=PATH give the path to a particular compiler

I don't understand, aren't they all in /usr/local/bin? Or do you use a version-specific prefix when installing each ghc version?

You can specify just the executable name, in which case cabal will search $PATH; or specify an absolute or relative path. So cabal install -w ghc-7.10.2 cabal install -w ghc-7.8.4 cabal install -w $HOME/my-ghc-checkout/inplace/bin/ghc-stage2 I install the binary distributions with --prefix=$HOME, so that the binaries all end up in ~/bin and I can invoke the version I want easily in this fashion. The only thing I find missing is the ability to install a binary distribution without overwriting the existing symlinks (e.g. ghc -> ghc-7.8.4). Regards, Reid Barton