Can't build ghc-cabal

[bgamari]

The Shake build system is currently unable to build inplace/bin/ghc-cabal and therefore can't bootstrap a fresh source tree,

$ make distclean
$ ./boot
$ ./configure
$ shake-build/build.sh 
Reading shake-build/cfg/system.config...
Reading package dependencies...
Error when running Shake build system:
* ghc/stage1/build/tmp/ghc-stage1
* OracleQ (PackageDataKey ("ghc/stage1/package-data.mk","ghc_stage1_C_SRCS"))
* ghc/stage1/package-data.mk
* ghc/stage1/package-data.mk ghc/stage1/haddock-prologue.txt ghc/stage1/setup-config ghc/stage1/build/autogen/cabal_macros.h
* libraries/transformers/dist-boot/package-data.mk
* libraries/transformers/dist-boot/package-data.mk libraries/transformers/dist-boot/haddock-prologue.txt libraries/transformers/dist-boot/setup-config libraries/transformers/dist-boot/build/autogen/cabal_macros.h
* /opt/exp/ghc/ghc/inplace/bin/ghc-cabal
Error, file does not exist and no rule available:
  /opt/exp/ghc/ghc/inplace/bin/ghc-cabal

[snowleopard]

Here is what is going on: I believe the Shake build system can build utils/ghc-cabal/dist*/build/tmp/ghc-cabal, but it just doesn't copy the resulting binary to inplace/bin/ghc-cabal.

At the moment this is a common issue for all program packages. I'll try to fix this today. I think it makes sense to place binaries directly to inplace/bin instead of building them in [...]/build/tmp first and then do the copying. I guess the old system had to do this because of the inability to properly handle dynamic dependencies with make. Please let me know if you know a reason to keep binaries in [...]/build/tmp.

Note, it is still unlikely that the build system will work on a fresh source tree after I do the fix because there are still some missing bits here and there. Currently the best way to hack on the build system is to run make first and then run the new build system on top of it.

[snowleopard]

I've pushed the following fixes:

• Build some programs directly in inplace/bin: 663ad01.
• Bootstrap ghc-cabal via a fake package-data.mk file: c98eebc.

Please let me know if this works for you.