Multiple versions of happy

[Oleg Grenrus]

One way is

cabal install happy --program-suffix=-1.19 --constraint='happy ^>=1.19'
cabal install happy --program-suffix=-1.20 --constraint='happy ^>=1.20'

happy-1.19 --version
Happy Version 1.19.12 Copyright (c) 1993-1996 Andy Gill, Simon Marlow
(c) 1997-2005 Simon Marlow

happy-1.20 --version
Happy Version 1.20.0 Copyright (c) 1993-1996 Andy Gill, Simon Marlow (c)
1997-2005 Simon Marlow

- Oleg

On 30.3.2021 16.22, Simon Peyton Jones via ghc-devs wrote:
>
> That’s (2), thanks.  How about (1)?
>
>  
>
> *From:*Sebastian Graf <sgraf1337 at gmail.com>
> *Sent:* 30 March 2021 14:22
> *To:* Simon Peyton Jones <simonpj at microsoft.com>
> *Cc:* ghc-devs at haskell.org
> *Subject:* Re: Multiple versions of happy
>
>  
>
> Hi Simon,
>
>  
>
> According to the configure script, you can use the HAPPY env variable.
> e.g.
>
>  
>
> $ HAPPY=/full/path/to/happy ./configure
>
>  
>
> Hope that helps. Cheers,
>
> Sebastian
>
>  
>
> Am Di., 30. März 2021 um 15:19 Uhr schrieb Simon Peyton Jones via
> ghc-devs <ghc-devs at haskell.org <mailto:ghc-devs at haskell.org>>:
>
>     What’s the approved mechanism to install multiple versions of
>     happy/alex etc?  Eg I tried to build ghc-9.0 and got this:
>
>     checking for makeinfo... no
>
>     checking for python3... /usr/bin/python3
>
>     checking for ghc-pkg matching /opt/ghc/bin/ghc... /opt/ghc/bin/ghc-pkg
>
>     checking for happy... /home/simonpj/.cabal/bin/happy
>
>     checking for version of happy... 1.20.0
>
>     configure: error: Happy version 1.19 is required to compile GHC.
>
>      
>
>     I so I have to
>
>      1. Install happy-1.19 without overwriting the installed happy-1.20
>      2. Tell configure to use happy-1.19
>
>     What’s the best way to do those two things?
>
>     Thanks
>
>     Simon
>
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