On Sat, Jan 31, 2009 at 04:01, John Goerzen
On Sat, Jan 31, 2009 at 01:51:54AM +0100, Krzysztof Skrz??tnicki wrote:
The following change in .cabal file may solve the problems:--- flag base4 description: Choose base-4 if possible default: True
library if flag(splitBase) if flag(base4) Build-Depends: base>=4, old-time, time, bytestring, containers, old-locale else Build-Depends: base>=3, old-time, time, bytestring, containers, old-locale else Build-Depends: base<3 Build-Depends: mtl, convertible >= 1.0.1, utf8-string ---
It works for me and I *think* will also work for other setups, most notably GHC 6.8.*.
Not out of the box. The base4 flag will be on by default for GHC 6.8.x too, and they'll get the base >= 4 dep, which will break. They'd have to configure with the option to disable a flag (-f -base4 if memory serves), which is neither intuitive nor automatic.
No, not really. I downloaded GHC 6.8.3 to test it, and it works: D:\biblioteki\HDBC-2.0.0>cabal install -w c:\ghc\ghc-6.8.3\bin\ghc Resolving dependencies... Configuring HDBC-2.0.0.2... Preprocessing library HDBC-2.0.0.2... Preprocessing executables for HDBC-2.0.0.2... Building HDBC-2.0.0.2... [1 of 7] Compiling Database.HDBC.SqlValue ( Database/HDBC/SqlValue.hs, dist\build/Database/HDBC/SqlValue.o ) [2 of 7] Compiling Database.HDBC.ColTypes ( Database/HDBC/ColTypes.hs, dist\build/Database/HDBC/ColTypes.o ) [3 of 7] Compiling Database.HDBC.Statement ( Database/HDBC/Statement.hs, dist\build/Database/HDBC/Statement.o ) Database/HDBC/Statement.hs:15:0: Warning: Module `Control.Exception' is imported, but nothing from it is used, except perhaps instances visible in `Control.Exception' To suppress this warning, use: import Control.Exception() [4 of 7] Compiling Database.HDBC.Types ( Database/HDBC/Types.hs, dist\build/Database/HDBC/Types.o ) [5 of 7] Compiling Database.HDBC.Utils ( Database/HDBC/Utils.hs, dist\build/Database/HDBC/Utils.o ) [6 of 7] Compiling Database.HDBC.DriverUtils ( Database/HDBC/DriverUtils.hs, dist\build/Database/HDBC/DriverUtils.o ) [7 of 7] Compiling Database.HDBC ( Database/HDBC.hs, dist\build/Database/HDBC.o ) C:\ghc\ghc-6.10.1\bin\ar.exe: creating dist\build\libHSHDBC-2.0.0.2.a Installing library in C:\Program Files\Haskell\HDBC-2.0.0.2\ghc-6.8.3 Registering HDBC-2.0.0.2... Reading package info from "dist\\installed-pkg-config" ... done. Saving old package config file... done. Writing new package config file... done. Checking: C:\ghc\ghc-6.8.3\bin>ghc-pkg list HDBC C:/ghc/ghc-6.8.3\package.conf: HDBC-2.0.0.2 So both 6.8.3 and 6.10.1 work as expected. I can't remember the exact page in docs, but as far as i remember if Cabal fails to satisfy conditions with certain flag on its default settings the flag is changed and dependency calculation restarts. All best Christopher Skrzętnicki