haskell初心者のため、正しい対処かどうかが不明です。
https://github.com/k00mi/mqtt-hs/blob/master/examples/subscribe.hs
のサンプルを動かしてみる。
package.yamlに下記を追加。
dependencies:
- mqtt-hs
- stm
stack buildしたが、
Error: While constructing the build plan, the following exceptions were encountered:
In the dependencies for mqtt-sample2-0.1.0.0:
mqtt-hs needed, but the stack configuration has no specified version (latest matching version is 1.0.2)
needed since mqtt-sample2 is a build target.
Some different approaches to resolving this:
* Consider trying 'stack solver', which uses the cabal-install solver to attempt to find some working build configuration. This can be
convenient when dealing with many complicated constraint errors, but results may be unpredictable.
* Recommended action: try adding the following to your extra-deps in /Users/xxxxx/git/yyyy/mqtt-sample2/stack.yaml:
mqtt-hs-1.0.2@sha256:db49cf78d8fb9dbffc01c2bc8cb4f8657b796865fdb7c4711ed59cddd8418f87
Plan construction failed.
extra-depsに追加しろと言われたので、追加。
extra-deps:
- mqtt-hs-1.0.2
またエラーが出た。
Error: While constructing the build plan, the following exceptions were encountered:
In the dependencies for mqtt-hs-1.0.2:
base-4.12.0.0 from stack configuration does not match >=4.6 && <4 .12="" span=""> (latest matching version is 4.11.1.0)
network-2.8.0.0 from stack configuration does not match >=2.0 && <2 .7="" span=""> (latest matching version is 2.6.3.6)
singletons-2.5.1 from stack configuration does not match >=0.9 && <2 .5="" span=""> (latest matching version is 2.4.1)
stm-2.5.0.0 from stack configuration does not match >=2.4 && <2 .5="" span=""> (latest matching version is 2.4.5.1)
needed due to mqtt-sample2-0.1.0.0 -> mqtt-hs-1.0.2
Some different approaches to resolving this:
* Set 'allow-newer: true' in /Users/xxxx/.stack/config.yaml to ignore all version constraints and build anyway.
* Consider trying 'stack solver', which uses the cabal-install solver to attempt to find some working build configuration. This can be
convenient when dealing with many complicated constraint errors, but results may be unpredictable.
* Build requires unattainable version of base. Since base is a part of GHC, you most likely need to use a different GHC version with the
matching base.
Plan construction failed.
allow-newer:trueにするのは嫌なので、stack solverを実行してみる。
しかしこれでも怒られる。
Using configuration file: stack.yaml
Using cabal packages:
- ./
Using resolver: lts-13.3
Warning: Installed version of cabal-install (2.2.0.0) is newer than stack has been tested with. If you run into difficulties, consider downgrading.
Using compiler: ghc-8.6.3
Asking cabal to calculate a build plan...
Trying with packages from lts-13.3 and 1 external packages as hard constraints...
Attempt failed.
>>>> Cabal errors begin
Warning: Unknown/unsupported 'ghc' version detected (Cabal 2.2.0.1 supports
'ghc' version < 8.5):
/Users/xxxx/.stack/programs/x86_64-osx/ghc-8.6.3/bin/ghc is version 8.6.3
Warning: cannot determine version of /usr/bin/strip :
""
CallStack (from HasCallStack):
die', called at ./Distribution/Client/Install.hs:238:21 in main:Distribution.Client.Install
cabal: Could not resolve dependencies:
[__0] trying: mqtt-sample2-0.1.0.0 (user goal)
[__1] trying: mqtt-hs-1.0.2 (dependency of mqtt-sample2)
[__2] next goal: base (dependency of mqtt-sample2)
[__2] rejecting: base-4.12.0.0/installed-4.1... (conflict: mqtt-hs =>
base>=4.6 && <4 .12="" span="">
[__2] rejecting: base-4.12.0.0 (constraint from non-upgradeable package
requires installed instance)
[__2] rejecting: base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0,
base-4.9.1.0, base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from main config
/private/var/folders/q1/rf5gg7zj7h9c07hn60_m1tcr0000gn/T/cabal-solver31325/cabal.config
requires ==4.12.0.0)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base (30), mqtt-hs (5), mqtt-sample2
(3)
<<<< Cabal errors end
Could not parse cabal-install errors:
>>>> Cabal errors begin
Warning: Unknown/unsupported 'ghc' version detected (Cabal 2.2.0.1 supports
'ghc' version < 8.5):
/Users/xxxxxxx/.stack/programs/x86_64-osx/ghc-8.6.3/bin/ghc is version 8.6.3
Warning: cannot determine version of /usr/bin/strip :
""
CallStack (from HasCallStack):
die', called at ./Distribution/Client/Install.hs:238:21 in main:Distribution.Client.Install
cabal: Could not resolve dependencies:
[__0] trying: mqtt-sample2-0.1.0.0 (user goal)
[__1] trying: mqtt-hs-1.0.2 (dependency of mqtt-sample2)
[__2] next goal: base (dependency of mqtt-sample2)
[__2] rejecting: base-4.12.0.0/installed-4.1... (conflict: mqtt-hs =>
base>=4.6 && <4 .12="" span="">
[__2] rejecting: base-4.12.0.0 (constraint from non-upgradeable package
requires installed instance)
[__2] rejecting: base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0,
base-4.9.1.0, base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from main config
/private/var/folders/q1/rf5gg7zj7h9c07hn60_m1tcr0000gn/T/cabal-solver31325/cabal.config
requires ==4.12.0.0)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base (30), mqtt-hs (5), mqtt-sample2
(3)
<<<< Cabal errors end
CallStack (from HasCallStack):
error, called at src/Stack/Solver.hs:131:25 in stack-1.9.3-AFEUqDV1V61AarVAbZ7WId:Stack.Solver
ghcのバージョンが問題らしいログ。
package.yamlのresolverが結構新しいし、mqtt-hsでテストがpassしているバージョンではないらしい。
resolver: lts-13.3
テストの通っているghcのバージョンに合わせる。
resolver: lts-11.22
無事buildができた。
