Johan asked me a great question about installing HP release candidates on Mac OS X, and I thought the answer would be of general interest:
On Wed, May 8, 2013 at 8:55 AM, Johan Tibell <johan.tib...@gmail.com> wrote: > I always want to try out new RCs when they are released, but I'm always > worried I'll screw up my current install. Can these happily coexist next to > old versions of the platform and random GHC binary installs I have? > Multiple HPs can exist side-by-side *so long as they are different GHC versions*. Nothing in the older install will get clobbered..... *EXCEPT*, the "bare" symlinks in /usr/local/bin will point at the newer version. For example, after installing both the last HP, and this RC1, I now have: /usr/bin/ghc@ -> /Library/Frameworks/GHC.framework/Versions/7.6.3-x86_64/usr/bin/ghc /usr/bin/ghc-7.4.2@ -> /Library/Frameworks/GHC.framework/Versions/7.4.2-i386/usr/bin/ghc-7.4.2 /usr/bin/ghc-7.6.3@ -> /Library/Frameworks/GHC.framework/Versions/7.6.3-x86_64/usr/bin/ghc-7.6.3 The following executables in /usr/bin are symlinked in both versioned and non-versioned forms: ghc ghc-pkg ghci haddock [set 1] These executables in /usr/bin and docs are linked only bare, and will end up pointing to the new ones: hpps hpc hsc2hs runghc runhaskell [set 2] alex cabal happy patch-ghc-settings uninstall-hs [set 3] /usr/share/man/man1/ghc.1 /usr/share/doc/ghc You can reset the executables in [set 1] and [set 2], as well as the docs, to a particular version with: sudo /Library/Frameworks/GHC.framework/Versions/*<version>*/Tools/create-links dummy /Library/Frameworks /usr Note that this will *not* update the links for the executables marked [set 3], though usually using later versions of those executables is no problem. If I could install a RC without disrupting my current setup (not changing > the ghc, etc symlinks would be a bonus) I'd be much more likely to try them > out! > This would be a good option for a re-worked installer. However, installers with user options on Mac OS X are a bit tricky both to develop and for users to use.... - Mark
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