Build errors of happy 1.19.8 on GHC 8.4.1-alpha1

[asr]

GHC 8.4.1-alpha1 was announced. While testing Agda with this version of GHC, I got errors like this one:

$ cabal install
...
Building executable 'happy' for happy-1.19.8..
...
[15 of 19] Compiling PrettyGrammar    ( src/PrettyGrammar.hs, dist/dist-sandbox-12f2e1a5/build/happy/happy-tmp/PrettyGrammar.o )

src/PrettyGrammar.hs:34:28: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Prelude.<>’,
                             imported from ‘Prelude’ at src/PrettyGrammar.hs:1:8-20
                             (and originally defined in ‘GHC.Base’)
                          or ‘PrettyGrammar.<>’, defined at src/PrettyGrammar.hs:68:9
   |
34 | ppTerm (App x ts) = text x <> ppTuple (map ppTerm ts)
   |                            ^^

Since the upstream version (master branch, commit 8e4dc43) compiles with GHC 8.4.1-alpha1, could you make a release, please?

Blocking agda/agda#2878.

[deepfire]

Interestingly, when I try to build a newer version from git (but not from a Hackage release), Cabal seems to think that happy needs happy:

nix-build packages.nix -A happy --argstr compiler ghcHEAD --show-trace --cores 0 --keep-failed
these derivations will be built:
  /nix/store/4sr8f83hl40g0v99xxlrs4rib03n7sx7-happy-1.19.8.drv
building path(s) ‘/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8’
setupCompilerEnvironmentPhase
Build with /nix/store/sprynaklr66848acrrp85mygn8wb1jxs-ghc-8.4.20180108.
unpacking sources
unpacking source archive /nix/store/9ag89vh38cx4xbjc880gk8a2cjhadxy5-happy-5ee44ae
source root is happy-5ee44ae
patching sources
compileBuildDriverPhase
setupCompileFlags: -package-db=/tmp/nix-build-happy-1.19.8.drv-0/package.conf.d -j8 -threaded
[1 of 1] Compiling Main             ( Setup.lhs, /tmp/nix-build-happy-1.19.8.drv-0/Main.o )

Setup.lhs:48:22: warning: [-Wdeprecations]
    In the use of ‘rawSystemProgramConf’
    (imported from Distribution.Simple.Program):
    Deprecated: "use runDbProgram instead"
   |
48 |   let runProgram p = rawSystemProgramConf (fromFlagOrDefault normal (buildVerbosity flags))
   |                      ^^^^^^^^^^^^^^^^^^^^
Linking Setup ...
configuring
configureFlags: --verbose --prefix=/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8 --libdir=$prefix/lib/$compiler --libsubdir=$pkgid --with-gcc=gcc --package-db=/tmp/nix-build-happy-1.19.8.drv-0/package.conf.d --ghc-option=-optl=-Wl,-rpath=/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/lib/ghc-8.4.20180108/happy-1.19.8 --ghc-option=-j8 --disable-split-objs --disable-library-profiling --disable-profiling --enable-shared --disable-coverage --enable-library-vanilla --enable-executable-dynamic --disable-tests --ghc-option=-split-sections
Using Parsec parser
Configuring happy-1.19.8...
Flags chosen: small_base=True
Dependency array -any: using array-0.5.2.0
Dependency base <5: using base-4.11.0.0
Dependency containers >=0.4.2: using containers-0.5.10.2
Dependency mtl >=2.2.1: using mtl-2.2.2
Source component graph: component exe:happy
Configured component graph:
    component happy-1.19.8-7ensv29swlI8cuXvlwmmF0-happy
        include base-4.11.0.0
        include array-0.5.2.0
        include containers-0.5.10.2
        include mtl-2.2.2
Linked component graph:
    unit happy-1.19.8-7ensv29swlI8cuXvlwmmF0-happy
        include base-4.11.0.0
        include array-0.5.2.0
        include containers-0.5.10.2
        include mtl-2.2.2
Ready component graph:
    definite happy-1.19.8-7ensv29swlI8cuXvlwmmF0-happy
        depends base-4.11.0.0
        depends array-0.5.2.0
        depends containers-0.5.10.2
        depends mtl-2.2.2
Using Cabal-2.1.0.0 compiled by ghc-8.4
Using compiler: ghc-8.4.20180108
Using install prefix: /nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8
Executables installed in:
/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/bin
Libraries installed in:
/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/lib/ghc-8.4.20180108/happy-1.19.8
Dynamic Libraries installed in:
/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/lib/ghc-8.4.20180108/x86_64-linux-ghc-8.4.20180108
Private executables installed in:
/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/libexec/x86_64-linux-ghc-8.4.20180108/happy-1.19.8
Data files installed in:
/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/share/x86_64-linux-ghc-8.4.20180108/happy-1.19.8
Documentation installed in:
/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/share/doc/x86_64-linux-ghc-8.4.20180108/happy-1.19.8
Configuration files installed in:
/nix/store/2grlz2qgcl6h7nhi686lfb8h7xjn0bf9-happy-1.19.8/etc
No alex found
Using ar found on system at:
/nix/store/wxn5gn8amxm1w0ikcx4gbs8a17wvss4j-binutils-2.28.1/bin/ar
No c2hs found
No cpphs found
No doctest found
Using gcc version 6.4.0 given by user at:
/nix/store/i9kmd5fpay17n2dfxzy3nx4pz98qb00a-gcc-wrapper-6.4.0/bin/gcc
Using ghc version 8.4.20180108 found on system at:
/nix/store/sprynaklr66848acrrp85mygn8wb1jxs-ghc-8.4.20180108/bin/ghc
Using ghc-pkg version 8.4.20180108 found on system at:
/nix/store/sprynaklr66848acrrp85mygn8wb1jxs-ghc-8.4.20180108/bin/ghc-pkg
No ghcjs found
No ghcjs-pkg found
No greencard found
Using haddock version 2.18.2 found on system at:
/nix/store/sprynaklr66848acrrp85mygn8wb1jxs-ghc-8.4.20180108/bin/haddock
No happy found
Using haskell-suite found on system at: haskell-suite-dummy-location
Using haskell-suite-pkg found on system at: haskell-suite-pkg-dummy-location
No hmake found
Using hpc version 0.67 found on system at:
/nix/store/sprynaklr66848acrrp85mygn8wb1jxs-ghc-8.4.20180108/bin/hpc
Using hsc2hs version 0.68.3 found on system at:
/nix/store/sprynaklr66848acrrp85mygn8wb1jxs-ghc-8.4.20180108/bin/hsc2hs
No hscolour found
No jhc found
Using ld found on system at:
/nix/store/i9kmd5fpay17n2dfxzy3nx4pz98qb00a-gcc-wrapper-6.4.0/bin/ld
No lhc found
No lhc-pkg found
No pkg-config found
Using runghc version 8.4.20180108 found on system at:
/nix/store/sprynaklr66848acrrp85mygn8wb1jxs-ghc-8.4.20180108/bin/runghc
Using strip version 2.28 found on system at:
/nix/store/wxn5gn8amxm1w0ikcx4gbs8a17wvss4j-binutils-2.28.1/bin/strip
Using tar found on system at:
/nix/store/yph5q0shcy0x524c2088dpqbprdfbzjz-gnutar-1.30/bin/tar
No uhc found
building
Preprocessing executable 'happy' for happy-1.19.8..
Setup: The program 'happy' is required but it could not be found

note: keeping build directory ‘/tmp/nix-build-happy-1.19.8.drv-1’
builder for ‘/nix/store/4sr8f83hl40g0v99xxlrs4rib03n7sx7-happy-1.19.8.drv’ failed with exit code 1

Looks like a Cabal v2 thing to me..

..and indeed: haskell/cabal#4009 -- although it was fixed, or was it?

[asr]

Interestingly, when I try to build a newer version from git (but not from a Hackage release), Cabal seems to think that happy needs happy

I'm getting the same behaviour on Ubuntu, that is, I can install from Hackage but I cannot install the upstream version on GitHub:

$ cabal install
...
Preprocessing executable 'happy' for happy-1.19.8..
setup: The program 'happy' is required but it could not be found
Failed to install happy-1.19.8

Tested with GHC 8.2.2 and

$ cabal --version
cabal-install version 2.0.0.1
compiled using version 2.0.1.0 of the Cabal library

[deepfire]

The solution was to:

rm -f src/AttrGrammarParser.ly src/Parser.ly tests/ParGF.yg

..and the build lived happily thereafter!

Apparently, Cabal sees the files, and makes the right (or wrong, PoV-dependent) deductions from that..

[asr]

I guess you meant

rm -f src/AttrGrammarParser.ly src/Parser.ly

Anyway, it seems we found again a known situation (see, for example, #88).

[simonmar]

To build a Happy tarball that bootstraps without needing Happy installed, you should make sdist from the top of the happy source tree.

[simonmar]

Happy 1.19.9 released