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 <sgraf1...@gmail.com> > *Sent:* 30 March 2021 14:22 > *To:* Simon Peyton Jones <simo...@microsoft.com> > *Cc:* ghc-devs@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@haskell.org <mailto:ghc-devs@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 > > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org <mailto:ghc-devs@haskell.org> > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > > <https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-devs&data=04%7C01%7Csimonpj%40microsoft.com%7Cb7e07fe78b644f0181be08d8f37ec03c%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637527073028872686%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=t3W8rl8mUbjPmEXYzcjzDYm1IiSjCDZNb7ATmz%2Fil28%3D&reserved=0> > > > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
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