Closed
Description
Steps to reproduce
Minimal example:
#!/usr/bin/env bash
set -ex
mkdir /tmp/stack-ghci-flags-bug
cd /tmp/stack-ghci-flags-bug
wget https://github.com/commercialhaskell/stack/releases/download/v2.5.1/stack-2.5.1-linux-x86_64.tar.gz
tar xaf stack-2.5.1-linux-x86_64.tar.gz
mkdir -p bug/src
cat >bug/bug.cabal <<END
name: bug
version: 0.1
cabal-version: >= 1.10
build-type: Simple
flag someflag
default: False
library
default-language: Haskell2010
hs-source-dirs: src
build-depends: base
exposed-modules: Bug1
if flag(someflag)
build-depends: containers
other-modules: Bug2
cpp-options: -DBUG
END
cat >bug/src/Bug1.hs <<END
{-# LANGUAGE CPP #-}
module Bug1 (Maybe) where
import Data.Maybe
#ifdef BUG
import Bug2
#endif
END
cat >bug/src/Bug2.hs <<END
module Bug2 (Map) where import Data.Map
END
cat >stack.yaml <<END
resolver: lts-16.18
packages:
- bug
flags:
bug:
someflag: true
END
./stack-2.5.1-linux-x86_64/stack --stack-root "$PWD"/.stack --system-ghc build
./stack-2.5.1-linux-x86_64/stack --stack-root "$PWD"/.stack --system-ghc ghci bug:lib
This results in
Configuring GHCi with the following packages: bug
GHCi, version 8.8.4: https://www.haskell.org/ghc/ :? for help
Loaded GHCi configuration from /home/tomi/.ghc/ghci.conf
[1 of 2] Compiling Bug1 ( /tmp/stack-ghci-flags-bug/bug/src/Bug1.hs, interpreted )
[2 of 2] Compiling Bug2 ( /tmp/stack-ghci-flags-bug/bug/src/Bug2.hs, interpreted )
/tmp/stack-ghci-flags-bug/bug/src/Bug2.hs:1:25: error:
Could not load module ‘Data.Map’
It is a member of the hidden package ‘containers-0.6.2.1’.
You can run ‘:set -package containers’ to expose it.
(Note: this unloads all the modules in the current scope.)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
1 | module Bug2 (Map) where import Data.Map
| ^^^^^^^^^^^^^^^
Failed, one module loaded.
<no location info>: error:
Could not load module ‘Bug2’
it is a hidden module in the package ‘bug-0.1’
Loaded GHCi configuration from /tmp/haskell-stack-ghci/3889aa92/ghci-script
With ./stack-2.5.1-linux-x86_64/stack --stack-root "$PWD"/.stack --system-ghc ghci --flag bug:someflag bug:lib it works just fine.
Adding -v reveals that -DBUG isn't passed to ghci either. Do note that my expected behaviour is not that Bug2 wouldn't be loaded. My expected behaviour is that the ghci is invoked with -DBUG and -package-id=containers-…, so that I can use ghci and ghcid with the flags that I set in stack.yaml.
Now here's a non-minimal real life example, just to show that this is actually reproducible with a real project, that perhaps some of you folks use and love:
#!/usr/bin/env bash
set -ex
mkdir /tmp/stack-ghci-flags-bug-xmobar
cd /tmp/stack-ghci-flags-bug-xmobar
wget https://github.com/commercialhaskell/stack/releases/download/v2.5.1/stack-2.5.1-linux-x86_64.tar.gz
tar xaf stack-2.5.1-linux-x86_64.tar.gz
git clone https://github.com/jaor/xmobar
cat >stack.yaml <<END
resolver: lts-16.18
packages:
- xmobar
flags:
xmobar:
with_xft: true
END
./stack-2.5.1-linux-x86_64/stack --stack-root "$PWD"/.stack --system-ghc build
./stack-2.5.1-linux-x86_64/stack --stack-root "$PWD"/.stack --system-ghc ghci xmobar:lib
This fails with:
[58 of 67] Compiling Xmobar.X11.MinXft ( /tmp/stack1/xmobar/.stack-work/dist/x86_64-linux/Cabal-3.0.1.0/build/Xmobar/X11/MinXft.hs, interpreted )
src/Xmobar/X11/MinXft.hsc:49:1: error:
Could not load module ‘Graphics.X11.Xrender’
It is a member of the hidden package ‘X11-xft-0.3.1’.
You can run ‘:set -package X11-xft’ to expose it.
(Note: this unloads all the modules in the current scope.)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
Failed, 57 modules loaded.
<no location info>: error:
Could not load module ‘Xmobar’
It is a member of the hidden package ‘xmobar-0.37’.
You can run ‘:set -package xmobar’ to expose it.
(Note: this unloads all the modules in the current scope.)
Stack version
$ ./stack-2.5.1-linux-x86_64/stack --version
Version 2.5.1, Git revision d6ab861544918185236cf826cb2028abb266d6d5 x86_64 hpack-0.33.0
It's also reproducible with stack 2.3.3 from Debian.
Method of installation
wget https://github.com/commercialhaskell/stack/releases/download/v2.5.1/stack-2.5.1-linux-x86_64.tar.gz
tar xaf stack-2.5.1-linux-x86_64.tar.gz
The rest of the system is Debian testing on amd64 with ghc 8.8.4.