Build of GHC 9.6 fails when the build directory is not a child of the source directory

[Torsten Schmits]

Hi Viktor,

I created an issue for this: 
https://gitlab.haskell.org/ghc/ghc/-/issues/22741

You can share your insights there!

On 4/30/23 03:00, Viktor Dukhovni wrote:
> For some time now I'd been unable to build GHC 9.6 from source. The
> reason turned out to be that my hadrian command-line selected an
> explicit build directory that was not an immediate child of the source
> directory (default it seems is "_build").
>
> With the source tree under "$HOME/dev/ghc/", the hardrian command
>
> $ hadrian/build -V -V -o"$HOME/dev/buildghc" --docs=no-sphinx 
> binary-dist-dir
>
> after building stage0, and running "configure" in libraries/base,
> reports an error finding HsFFI.h:
>
> Reading parameters from 
> $HOME/dev/buildghc/stage1/libraries/base/build/base.buildinfo
> /usr/bin/cc '-fuse-ld=gold' /tmp/2303653-4.c -o /tmp/2303653-5
> '-D__GLASGOW_HASKELL__=906' \
> '-Dlinux_BUILD_OS=1' \
> '-Dx86_64_BUILD_ARCH=1' \
> '-Dlinux_HOST_OS=1' \
> '-Dx86_64_HOST_ARCH=1' \
> -I$HOME/dev/buildghc/stage1/libraries/base/build/autogen \
> -I$HOME/dev/buildghc/stage1/libraries/base/build/include \
> -Ilibraries/base/include \
> -Ilibraries/base \
> -I/usr/include \
> -I$HOME/dev/buildghc/stage1/inplace/../../..//libraries/ghc-bignum/include/ 
> \
> -I$HOME/dev/buildghc/stage1/libraries/ghc-bignum/build/include/ \
> -I$HOME/dev/buildghc/stage1/inplace/../../..//libraries/ghc-bignum/include 
> \
> -I$HOME/dev/buildghc/stage1/libraries/ghc-bignum/build/include \
> -I$HOME/dev/buildghc/stage1/inplace/../../..//rts/include \
> -I$HOME/dev/buildghc/stage1/rts/build/include \
> '-I$HOME/dev/buildghc/stage1/inplace/../../..//rts/@FFIIncludeDir@' \
> '-I$HOME/dev/buildghc/stage1/rts/build/@FFIIncludeDir@' \
> '-I$HOME/dev/buildghc/stage1/inplace/../../..//rts/@LibdwIncludeDir@' \
> '-I$HOME/dev/buildghc/stage1/rts/build/@LibdwIncludeDir@' \
> -L$HOME/dev/buildghc/stage1/inplace/../libraries/ghc-bignum/build \
> -L$HOME/dev/buildghc/stage1/inplace/../libraries/ghc-prim/build \
> -L$HOME/dev/buildghc/stage1/inplace/../rts/build -iquote \
> $HOME/dev/ghc/libraries/base \
> '-fuse-ld=gold'
>
> There are two issues to note here:
>
> - "hadrian" fails to substitute @FFIIncludeDir@ and @LibdwIncludeDir at .
> This used to be handled by "configure", but the job of turning
> "rts.cabal.in" into "rts.cabal" seems to have been reassigned to
> "hadrian".
>
> - With the build output directory a sibling rather than a child of
> the source tree, the path to "rts/include" is not constructed
> correctly. The path:
>
> -I$HOME/dev/buildghc/stage1/inplace/../../..//rts/include
>
> should have been:
>
> -I$HOME/dev/buildghc/stage1/inplace/../../../ghc/rts/include
>
> Switching to the default path proved to be a viable work-around, but
> perhaps other choices should also work.
>