Thanks. I installed msys but again I faced the same problem. I solved it by copying mingw directory from ghc-7.6.3 distribution to inplace/mingw subdirectory in the source tree. That's silly but it works. Now I have problems with installing alex and happy. I followed steps on wiki page, ie. downloaded cabal.exe and added it to path. I can run 'cabal update' and 'cabal install alex happy' but it looks like packages are not installed in my home directory (home under msys shell that is). Any idea where are they installed so that I can add them to path? Janek Dnia czwartek, 13 marca 2014, kyra napisał:

On 3/13/2014 13:18, Jan Stolarek wrote:

...

I'm trying to build GHC on 64-bit Windows 7. I installed Cygwin, GHC and cloned the main repo but when I run configure I get this error:

configure: Building in-tree ghc-pwd checking for path to top of build tree... cygwin warning: MS-DOS style path detected: C:/cygwin64/home/tewi/head Preferred POSIX equivalent is: /home/tewi/head CYGWIN environment variable option "nodosfilewarning" turns off this warning. Consult the user's guide for more details about POSIX paths: http://cygwin.com/cygwin-ug-net/using.html#using-pathnames C:/cygwin64/home/tewi/head checking for gcc... C:/cygwin64/home/tewi/head/inplace/mingw/bin/gcc.exe checking whether the C compiler works... no configure: error: in `/home/tewi/head': configure: error: C compiler cannot create executables See `config.log' for more details

I have gcc installed under Cygwin, but for some reason ./configure is looking for an in-tree compiler. I tried passing --with-gcc=/usr/bin/gcc to configure but with no result. Help?

Janek

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Windows GHC *shall* use in-tree compiler. Windows GHC does *not* use cygwin runtime at all!

Now the best way to build GHC on Windows is to use MSYS2: https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows/MSYS2.

I'd also add that most recent versions are

http://sourceforge.net/projects/msys2/files/Base/i686/msys2-base-i686-20140 216.tar.xz/download for 32-bit windows,

and

http://sourceforge.net/projects/msys2/files/Base/x86_64/msys2-base-x86_64-2 0140216.tar.xz/download for 64-bit windows.

Please, take into account this is *build environment* and in no way is related to gcc compiler and runtime used by GHC on Windows.

Cheers, Kyra

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On 3/13/2014 15:48, Jan Stolarek wrote:

Thanks. I installed msys but again I faced the same problem. I solved it by copying mingw directory from ghc-7.6.3 distribution to inplace/mingw subdirectory in the source tree. That's silly but it works. I suspect this is because you've cloned repo under system other than windows and thus didn't clone ghc-tarballs repo. Now I have problems with installing alex and happy. I followed steps on wiki page, ie. downloaded cabal.exe and added it to path. I can run 'cabal update' and 'cabal install alex happy' but it looks like packages are not installed in my home directory (home under msys shell that is). Any idea where are they installed so that I can add them to path? AFAIUI, default prefix is C:\Users\<username>\AppData\Roaming\cabal\<arch>-windows-ghc-<version>.

But I'd recommend to install things to predefined location, using --prefix option of cabal, e.g. thus: cabal install --global --prefix=<location> --datadir=<location> to avoid potential problems with national chars in username. This problem existed in the past, not sure it exists now, though. Kyra