Stack cannot find happy during build

[W4RH4WK]

While trying to build one project that makes use of pretty-show, stack complains about not finding happy, although it has been installed previously and can be run:

> stack exec -- happy --version
Happy Version 1.19.5 Copyright (c) 1993-1996 Andy Gill, Simon Marlow (c) 1997-2005 Simon Marlow

Happy is a Yacc for Haskell, and comes with ABSOLUTELY NO WARRANTY.
This program is free software; you can redistribute it and/or modify
it under the terms given in the file 'LICENSE' distributed with
the Happy sources.

Building produces following error message:

--  While building package pretty-show-1.6.12 using:
      C:\sr\setup-exe-cache\x86_64-windows\Cabal-simple_Z6RU0evB_1.24.2.0_ghc-8.0.2.exe --builddir=.stack-work\dist\ca59d0ab configure --with-ghc=C:\Users\alex\AppData\Local\Programs\stack\x86_64-windows\ghc-8.0.2\bin\ghc.EXE --with-ghc-pkg=C:\Users\alex\AppData\Local\Programs\stack\x86_64-windows\ghc-8.0.2\bin\ghc-pkg.EXE --user --package-db=clear --package-db=global --package-db=C:\sr\snapshots\bf8f3162\pkgdb --libdir=C:\sr\snapshots\bf8f3162\lib --bindir=C:\sr\snapshots\bf8f3162\bin --datadir=C:\sr\snapshots\bf8f3162\share --libexecdir=C:\sr\snapshots\bf8f3162\libexec --sysconfdir=C:\sr\snapshots\bf8f3162\etc --docdir=C:\sr\snapshots\bf8f3162\doc\pretty-show-1.6.12 --htmldir=C:\sr\snapshots\bf8f3162\doc\pretty-show-1.6.12 --haddockdir=C:\sr\snapshots\bf8f3162\doc\pretty-show-1.6.12 --dependency=array=array-0.5.1.1 --dependency=base=base-4.9.1.0 --dependency=filepath=filepath-1.4.1.1 --dependency=ghc-prim=ghc-prim-0.5.0.0 --dependency=haskell-lexer=haskell-lexer-1.0.1-KbrNzOgvOlP3fb0pmnXx0E --dependency=pretty=pretty-1.1.3.3 --extra-include-dirs=C:\Users\alex\AppData\Local\Programs\stack\x86_64-windows\msys2-20150512\mingw64\include --extra-lib-dirs=C:\Users\alex\AppData\Local\Programs\stack\x86_64-windows\msys2-20150512\mingw64\lib
    Process exited with code: ExitFailure 1
    Logs have been written to: Z:\insieme\code\analysis\src\cba\haskell\insieme-hat\.stack-work\logs\pretty-show-1.6.12.log

    Configuring pretty-show-1.6.12...
    Cabal-simple_Z6RU0evB_1.24.2.0_ghc-8.0.2.exe: The program 'happy' is required
    but it could not be found.

The project can be found here. The following steps should reproduce the issue.

• clone https://github.com/insieme/insieme
• checkout 0fd76d435ec403afa1e9b8efcd1a99c974cf1b91
• cd code/analysis/src/cba/haskell/insieme-hat
• remove stack-8.0.yaml (just to make sure this does not interfere somehow)
• edit stack.yaml, change resolver to lts-8.14
• stack setup
• stack build alex
• stack build happy
• stack build c2hs
• stack build

Note that this issue is encountered on Windows 10 64 Bit including the creators update.

Stack version

> stack --version
Version 1.4.0, Git revision e714f1dd3fade19496d91bd6a017e435a96a6bcd x86_64 hpack-0.17.0

Method of installation

• Official binary, downloaded from stackage.org or fpcomplete's package repository

[W4RH4WK]

This indeed seems to be related to #3151 as this issue does not happen with Stack 1.3.2.

[mgsloan]

If I build happy, then this works.

Oddly enough, for me it doesn't seem to have happy in the snapshot despite its presence in lts-8.14. This causes happy to not get installed automatically. This could certainly use additional investigation.

[snoyberg]

I believe this is fixed by my PR #3249, based on my testing. I'd appreciate if you could give a shot at building with a Stack built from that branch (extensible-exceptions) and let me know if you can confirm. Note that that branch should still be considered experimental, and therefore you probably don't want to make it your main Stack executable.

[snoyberg]

Closing now that #3249 is merged.