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如何拒绝使用某个ghc版本进行构建

[英]how to refuse building with a certain ghc version

原文 2014-08-04 18:07:37 5 1 haskell

One of my cabal libraries has hit this GHC bug . 我的一个cabal库已经遇到了这个GHC错误。 I currently have a workaround in the source, however since this GHC bug was now fixed in 7.8.3, I'm planning to remove the workaround soon. 我目前在源代码中有一个解决方法，但是由于此GHC错误现已在7.8.3中修复，我计划很快删除该解决方法。 I'm not sure how to handle the situation to make the library refuse to build on GHC 7.8.0-7.8.2 though. 我不知道如何处理这种情况，使图书馆拒绝在GHC 7.8.0-7.8.2上构建。 Ideally I'd like that the user gets a nice error message ("GHC 7.8.0-7.8.2 have a bug preventing this library to build correctly, please use 7.8.3+" for instance). 理想情况下，我希望用户得到一个很好的错误消息（“GHC 7.8.0-7.8.2有一个错误阻止这个库正确构建，请使用7.8.3+”）。

Maybe some cabal flag? 也许一些阴谋旗？ Or some CPP magic? 还是一些CPP魔术？ I think the fix is in base , maybe I can condition on that, although it seems tricky or impossible. 我认为修复是base ，也许我可以对此进行调整，尽管它似乎很棘手或不可能。

Or I could carry the workaround for a very long time, until the issue is completely moot, but since mostly early adopters would have used 7.8.2 and earlier, I'm thinking it should not be a problem to drop the support, with a proper warning. 或者我可以进行很长一段时间的解决方法，直到问题完全没有实际意义，但由于大多数早期采用者会使用7.8.2及更早版本，我认为放弃支持不应该是一个问题，适当的警告。

1 个解决方案

GHC 7.8.3 incremented the version number of base from 4.7.0.0 (used by the previous 7.8 releases) to 4.7.0.1. GHC 7.8.3递增的版本号base从4.7.0.0（由先前的7.8版本中使用）来4.7.0.1。 You can use the build-depends cabal field to exclude that version, for instance by adding the constraint base <=4.7.0.0 || >4.7.0.0 您可以使用build-depends cabal字段来排除该版本，例如通过添加约束base <=4.7.0.0 || >4.7.0.0 base <=4.7.0.0 || >4.7.0.0 . base <=4.7.0.0 || >4.7.0.0 。