从堆栈中安装ghcjs

Question

我通过堆栈安装了GHC (以便stack ghc -- --version显示GHC-7.10.3 )

$ stack install ghcjs

Run from outside a project, using implicit global project config
Using resolver: lts-5.2 from implicit global project's config file: /home/john/.stack/global-project/stack.yaml
The following target packages were not found: ghcjs

一些资源表明，ghcjs在某种程度上是实验性的(虽然还在进一步的阶段)。

看着http://docs.haskellstack.org/en/stable/ghcjs/，我想也许我能找到stack.yaml并改变它。

若要在堆栈>= 0.1.8中使用GHCJS，请将GHCJS版本放在stack.yaml的编译器字段中。然后是stack setup

$ cat ~/.stack/global-project/stack.yaml
# This is the implicit global project's config file, which is only used when
# 'stack' is run outside of a real project.  Settings here do _not_ act as
# defaults for all projects.  To change stack's default settings, edit
# '/home/john/.stack/config.yaml' instead.
#
# For more information about stack's configuration, see
# http://docs.haskellstack.org/en/stable/yaml_configuration.html
#
flags: {}
extra-package-dbs: []
packages: []
extra-deps: []
resolver: lts-5.2

我们被告知要看config.yaml，它看起来同样是空白的。你说得对吗，我要上死胡同了吗？

$ cat ~/.stack/config.yaml
# This file contains default non-project-specific settings for 'stack', used
# in all projects.  For more information about stack's configuration, see
# http://docs.haskellstack.org/en/stable/yaml_configuration.html
#
{}

我只想用堆栈安装ghcjs。

Answer 1

看看这个页面：http://docs.haskellstack.org/en/stable/ghcjs/

我试着：

1. 启动一个新的堆栈项目，例如stack new js-test
2. 通过添加此节(摘自上述链接)修改stack.yaml文件： 编译器:ghcjs-0.2.20160414_ghc-7.10.3编译器-检查:匹配-精确设置-信息: ghcjs:来源:ghcjs-0.2.20160414_ghc-7.10.3：ghc-7.10.3.tar.gz sha1: 6d6f307503be9e94e0c96ef1308cf224d06be3
3. 将resolver:更改为lts-5.12 -这与上面的节相匹配。
4. 运行stack setup以安装编译器。

第四步需要一段时间。