(Sorry for double posting). New Alex and Happy will have conditional checks to see whether they are generating code for GHC <=7.6 or for GHC > 7.6. The only two intended situations when things will go wrong are:
1) You have these new versions of Alex and Happy and you are trying to compile 7.7 HEAD that does not contain new primops. Alex/Happy will generate calls to new primops, but since your HEAD doesn't have them the build will fail during stage2. 2) You have HEAD containing new primops, but you have old versions of Alex and Happy. This might happen if you upgrade Alex anmd Happy, pull changes but try to build without cleaning. Again, stage2 will fail because Alex/Happy will generate calls to old primops. ./configure will check whether an up-to-date versions of Alex and Happy are installed on the system. Note also that both Alex and Happy already have tons of such conditionals so there is nothing new going on in here: #if __GLASGOW_HASKELL__ >= 603 #include "ghcconfig.h" #elif defined(__GLASGOW_HASKELL__) #include "config.h" #endif #if __GLASGOW_HASKELL__ >= 503 import Data.Array import Data.Char (ord) import Data.Array.Base (unsafeAt) #else import Array import Char (ord) #endif #if __GLASGOW_HASKELL__ >= 503 import GHC.Exts #else import GlaExts #endif Janek ----- Oryginalna wiadomość ----- Od: "Joachim Breitner" <m...@joachim-breitner.de> Do: ghc-devs@haskell.org Wysłane: poniedziałek, 16 wrzesień 2013 15:04:44 Temat: Re: HEADS UP: New primops on the way Hi, Am Montag, den 16.09.2013, 15:48 +0200 schrieb Jan Stolarek: > 1) Upgrade to latest versions of Alex and Happy (cabal update && cabal > install alex happy). These versions are not yet available. When they > are DO NOT INSTALL THEM UNTIL CHANGES ARE PUSHED INTO HEAD. why? Will they not be backwards-compatible? Does this mean that I cannot have a system (without sandboxing) that can build both ghc-7.6 and ghc-7.8? I’m worried about the implications for distribution package maintainers, where ghc, happy and alex are independent packages. Greetings, Joachim -- Joachim Breitner e-Mail: m...@joachim-breitner.de Homepage: http://www.joachim-breitner.de ICQ#: 74513189 Jabber-ID: nome...@joachim-breitner.de _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://www.haskell.org/mailman/listinfo/ghc-devs
