我如何才能有条件? [英] How can I have a conditional on cabal?
问题描述
我有一个Haskell库,可以导出几个模块。我用 GHC
和 GHCJS
编译该库。我正在使用 stack
来构建库。这些模块之一取决于 reflex-dom
。问题是由于无法链接 gtk + 3
reflex-dom >在OSX上。因此,如果编译器为 GHC
,我想排除该库。我该如何实现?
I have a Haskell library which exports several modules. I compile that library with both GHC
and GHCJS
. I'm using stack
to build the library. One of those modules depends on reflex-dom
. The issue is that I am not able to compile reflex-dom
on GHC due to not being able to link gtk+3
on OSX. As such, I'd like to exclude that library if the compiler is GHC
. How can I achieve that?
exposed-modules:
MyLib.Foo
MyLib.Bar
MyLib.App.Backend.Reflex
MyLib.App.Backend.Gloss
...
build-depends:
base ...
reflex-dom >= 0.2 && <0.3
推荐答案
虽然您可能不想这样做,在cabal用户手册的配置部分中介绍了执行此操作的方法:
While you may not want to do this, the way to do this is described in the "configurations" section of the cabal user manual:
https://www.haskell.org/cabal/users-guide/developing-packages.html#configurations
特别是,您应该能够这样写相关的部分:
In particular, you should be able to write the relevant sections as such:
exposed-modules:
MyLib.Foo
MyLib.Bar
MyLib.App.Backend.Reflex
MyLib.App.Backend.Gloss
if !impl(ghc)
exposed-modules:
OtherModule
build-depends: etc, etc, etc
if !impl(ghc)
build-depends: etc1, etc2
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