Basic cabal support for waf. This builds whole source trees to a private sandbox (much like cabal-dev) and supports package level parallel builds.

Set an alias so waf works anywhere:

destroyer:cabal-waf nhowell$ alias waf=$PWD/waf

Run configure from the root, it only needs to be done once:

destroyer:cabal-waf nhowell$ waf configure
Setting top to                           : /Source/cabal-waf 
Setting out to                           : /Source/cabal-waf/build 
Checking for program cabal               : /usr/bin/cabal 
Checking for program ghc-pkg             : /usr/bin/ghc-pkg 
Created package database                 : /Source/cabal-waf/build/package.conf.d 
'configure' finished successfully (0.020s)

Then run 'waf' or 'waf build' from the root to build the full tree. You can also do this in any subdirectory but it will only build child directories, not any ancestors.

destroyer:cabal-waf nhowell$ waf
Waf: Entering directory `/Source/cabal-waf/build'
[ 1/22] cabal_configure: example/lib1/lib1.cabal -> build/example/lib1/setup-config
[ 2/22] cabal_build: build/example/lib1/setup-config -> build/example/lib1/package.conf.inplace
Preprocessing library lib1-0.1...
Building lib1-0.1...
[1 of 1] Compiling Lib1             ( Lib1.hs, /Source/cabal-waf/build/example/lib1/build/Lib1.o )
[1 of 1] Compiling Lib1             ( Lib1.hs, /Source/cabal-waf/build/example/lib1/build/Lib1.p_o )
Registering lib1-0.1...
[ 3/22] cabal_copy: build/example/lib1/package.conf.inplace
[ 4/22] cabal_register: build/example/lib1/package.conf.inplace
[ 5/22] ghcpkg_register: build/example/lib1/package.conf.inplace
[ 6/22] cabal_touch: build/example/lib1/package.conf.inplace -> build/lib1.package
[ 7/22] cabal_configure: example/lib2/lib2.cabal -> build/example/lib2/setup-config
[ 8/22] cabal_build: build/example/lib2/setup-config -> build/example/lib2/package.conf.inplace
Preprocessing library lib2-0.1...
Building lib2-0.1...
[1 of 1] Compiling Lib2             ( Lib2.hs, /Source/cabal-waf/build/example/lib2/build/Lib2.o )
[1 of 1] Compiling Lib2             ( Lib2.hs, /Source/cabal-waf/build/example/lib2/build/Lib2.p_o )
Registering lib2-0.1...
[ 9/22] cabal_copy: build/example/lib2/package.conf.inplace
[10/22] cabal_register: build/example/lib2/package.conf.inplace
[11/22] ghcpkg_register: build/example/lib2/package.conf.inplace
[12/22] cabal_touch: build/example/lib2/package.conf.inplace -> build/lib2.package
[13/22] cabal_configure: example/lib3/lib3.cabal -> build/example/lib3/setup-config
[14/22] cabal_build: build/example/lib3/setup-config -> build/example/lib3/package.conf.inplace
Preprocessing library lib3-0.1...
Building lib3-0.1...
[1 of 1] Compiling Lib3             ( Lib3.hs, /Source/cabal-waf/build/example/lib3/build/Lib3.o )
[1 of 1] Compiling Lib3             ( Lib3.hs, /Source/cabal-waf/build/example/lib3/build/Lib3.p_o )
Registering lib3-0.1...
[15/22] cabal_copy: build/example/lib3/package.conf.inplace
[16/22] cabal_register: build/example/lib3/package.conf.inplace
[17/22] ghcpkg_register: build/example/lib3/package.conf.inplace
[18/22] cabal_touch: build/example/lib3/package.conf.inplace -> build/lib3.package
[19/22] cabal_configure: example/exe/exe.cabal -> build/example/exe/setup-config
[20/22] cabal_build: build/example/exe/setup-config -> build/example/exe/package.conf.inplace
Preprocessing executables for exe-0.1...
Building exe-0.1...
[1 of 1] Compiling Main             ( exe.hs, /Source/cabal-waf/build/example/exe/build/exe/exe-tmp/Main.o )
Linking /Source/cabal-waf/build/example/exe/build/exe/exe ...
[21/22] cabal_copy: build/example/exe/package.conf.inplace
[22/22] cabal_touch: build/example/exe/package.conf.inplace -> build/exe.package
Waf: Leaving directory `/Source/cabal-waf/build'
'build' finished successfully (13.995s)

Update a file and all dependencies will be rebuilt:

destroyer:cabal-waf nhowell$ echo >> example/lib2/Lib2.hs 

Note: touch does not trigger rebuilds as waf checks the file contents, not timestamps.

destroyer:cabal-waf nhowell$ waf
Waf: Entering directory `/Source/cabal-waf/build'
[ 8/22] cabal_build: build/example/lib2/setup-config -> build/example/lib2/package.conf.inplace
Preprocessing library lib2-0.1...
Building lib2-0.1...
[1 of 1] Compiling Lib2             ( Lib2.hs, /Source/cabal-waf/build/example/lib2/build/Lib2.o )
[1 of 1] Compiling Lib2             ( Lib2.hs, /Source/cabal-waf/build/example/lib2/build/Lib2.p_o )
Registering lib2-0.1...
[ 9/22] cabal_copy: build/example/lib2/package.conf.inplace
[10/22] cabal_register: build/example/lib2/package.conf.inplace
[11/22] ghcpkg_register: build/example/lib2/package.conf.inplace
[12/22] cabal_touch: build/example/lib2/package.conf.inplace -> build/lib2.package
[13/22] cabal_configure: example/lib3/lib3.cabal -> build/example/lib3/setup-config
[14/22] cabal_build: build/example/lib3/setup-config -> build/example/lib3/package.conf.inplace
Preprocessing library lib3-0.1...
Building lib3-0.1...
Registering lib3-0.1...
[15/22] cabal_copy: build/example/lib3/package.conf.inplace
[16/22] cabal_register: build/example/lib3/package.conf.inplace
[17/22] ghcpkg_register: build/example/lib3/package.conf.inplace
[18/22] cabal_touch: build/example/lib3/package.conf.inplace -> build/lib3.package
[19/22] cabal_configure: example/exe/exe.cabal -> build/example/exe/setup-config
[20/22] cabal_build: build/example/exe/setup-config -> build/example/exe/package.conf.inplace
Preprocessing executables for exe-0.1...
Building exe-0.1...
Linking /Source/cabal-waf/build/example/exe/build/exe/exe ...
[21/22] cabal_copy: build/example/exe/package.conf.inplace
[22/22] cabal_touch: build/example/exe/package.conf.inplace -> build/exe.package
Waf: Leaving directory `/Source/cabal-waf/build'
'build' finished successfully (7.536s)

Rebuilds with no changes take a very short amount of time:

destroyer:cabal-waf nhowell$ waf
Waf: Entering directory `/Source/cabal-waf/build'
Waf: Leaving directory `/Source/cabal-waf/build'
'build' finished successfully (0.008s)