Template Haskell and stage-1

[Gergely Risko]

I also have a related request, if someone comes around with great build
system experience.  I usually hack on GHC with BUILD_DOCS = NO, and it
always annoys me that the xhtml and co libraries are built even then,
without ever needing those, making my build slower.

Gergely

On Wed, 6 Nov 2013 13:43:02 +0000, Simon Peyton-Jones <simonpj at microsoft.com> writes:

> I’d like to make –XtemplateHaskell simply illegal in a stage-1
> compiler. After all, it is!
>
> But for some reason we use the stage1 compiler to generate
> dependencies for the DPH libraries; those libraries have {-# LANGUAGE
> TemplateHaskell #-}, so the dependency generation fails. See below.
>
> But WHY do we generate deps for DPH with stage1? We don’t *compile*
> the DPH libraries with stage1, because they need TH. Can’t we just
> generate deps with stage2?
>
> For now I’ll make it a warning, but could someone fix the build
> system?
>
> Thanks
>
> Simon
>
> mv
> libraries/dph/dph-lifted-copy/dist-install/build/.depend-v-dyn.c_asm.tmp
> libraries/dph/dph-lifted-copy/dist-install/build/.depend-v-dyn.c_asm
>
> "rm" -f
> libraries/dph/dph-lifted-copy/dist-install/build/.depend-v-dyn.haskell.
> tmp 
>
> "inplace/bin/ghc-stage1" -M -static -H32m -O -Werror -Wall -H64m -O0 -
> package-name dph-lifted-copy-0.8.0.1 -hide-all-packages -i -
> ilibraries/dph/dph-lifted-copy/. -
> ilibraries/dph/dph-lifted-copy/dist-install/build -
> ilibraries/dph/dph-lifted-copy/dist-install/build/autogen -
> Ilibraries/dph/dph-lifted-copy/dist-install/build -
> Ilibraries/dph/dph-lifted-copy/dist-install/build/autogen -
> Ilibraries/dph/dph-lifted-copy/. -optP-include -
> optPlibraries/dph/dph-lifted-copy/dist-install/build/autogen/cabal_macros.
> h -package array-0.5.0.0 -package base-4.7.0.0 -package
> dph-base-0.8.0.1 -package dph-prim-par-0.8.0.1 -package
> ghc-7.7.20131106 -package random-1.0.1.1 -package
> template-haskell-2.9.0.0 -package vector-0.10.9.1 -Odph -
> funbox-strict-fields -fcpr-off -fno-warn-orphans -
> fno-warn-missing-signatures -XHaskell98 -XTypeFamilies -XGADTs -
> XRankNTypes -XBangPatterns -XMagicHash -XUnboxedTuples -XTypeOperators
> -O2 -O -dcore-lint -fno-warn-amp -fno-warn-deprecated-flags -Wwarn -
> no-user-package-db -rtsopts -odir
> libraries/dph/dph-lifted-copy/dist-install/build -hidir
> libraries/dph/dph-lifted-copy/dist-install/build -stubdir
> libraries/dph/dph-lifted-copy/dist-install/build -dep-makefile
> libraries/dph/dph-lifted-copy/dist-install/build/.depend-v-dyn.haskell.
> tmp -dep-suffix "" -dep-suffix "dyn_" -include-pkg-deps
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Lifted.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Lifted/Closure.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Lifted/Combinators.
> hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Lifted/PArray.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Lifted/Scalar.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Lifted/TH/Repr.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Lifted/Unboxed.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArr.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/Base.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/PData.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/PDataInstances.
> hs libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/PRepr.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/PReprInstances.
> hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/Scalar.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/ScalarInstances.
> hs libraries/dph/dph-lifted-copy/./Data/Array/Parallel/PArray/Types.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude/Base.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude/Bool.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude/Double.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude/Float.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude/Int.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude/Tuple.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prelude/Word8.hs
> libraries/dph/dph-lifted-copy/./Data/Array/Parallel/Prim.hs
>
> ghc-stage1:
> libraries/dph/dph-lifted-copy/Data/Array/Parallel/Lifted/TH/Repr.hs:1:14-
> 28: Template Haskell requires GHC with interpreter support
>
> Perhaps you are using a stage-1 compiler?
>
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