在cabal中使用Extra-lib-dirs的相对路径 [英] Use relative paths for extra-lib-dirs on cabal

问题描述

我有一个带有Makefile的C库"myboo".我想包装这个库.我不想将其安装到/usr/local，因为"myboo"不是主要模块.另外，建议不要将"myboo"构建为动态库但作为静态库.

我通过自定义Setup.py来构建"myboo"；

  main :: IO()main = defaultMainWithHooks simpleUserHooks {preBuild = \ a b->makeLib a b>>preBuild simpleUserHooks a b}makeLib :: Args->BuildFlags->IO()makeLib _标志=做let verbosity = fromFlag $ buildVerbosity标志cflags<-lookupEnv"CFLAGS">> = return.也许" IDsetEnv"CFLAGS" $"-fPIC" ++('':cflags)rawSystemExit详细信息"env" ["make"，"--directory = myboo"，"libmyboo.a"] 

然后我将myboo.cabal安排为将我的haskell代码链接到C库；

 库暴露的模块:MyBoo构建依赖关系:基本> = 4.7&&< 4.8hs-source-dirs:src默认语言:Haskell2010包含目录:myboo额外的图书馆:mybooExtra-lib-dirs:myboo 

当我运行"cabal build"时，收到以下消息.

  myboo-0.1.0.0:library-dirs:myboo是一个没有意义的相对路径(因为没有相对关系).您可以相对于使用$ {pkgroot}打包数据库本身.(使用--force覆盖) 

如果我写"extra-lib-dirs:/absolute/path/to/working/dir/myboo"，看来它运行良好.但这不是一个好方法，因为/absolute/...只是一个工作目录.

如何解决以上错误消息?我的环境在这里；

 ％ghc --versionGlorious Glasgow Haskell编译系统，版本7.8.2％cabal --versioncabal安装版本1.20.0.2使用Cabal库的1.20.0.0版本％cat/etc/lsb-发行版DISTRIB_ID = UbuntuDISTRIB_RELEASE = 14.04DISTRIB_CODENAME =可信任DISTRIB_DESCRIPTION ="Ubuntu 14.04 LTS" 

解决方案

您可以编写自己的Setup.hs和设置 Distribution.Simple.confHook .在挂钩函数中，修改 Distribution.PackageDescription.extraLibDirs 以包括目录.

请注意，您还需要在阴谋文件中将 build-type 更改为 Custom .

这里是指向 Setup.hs 的链接，在其中完成了我写的内容./p>

I have a C library "myboo" which has Makefile. I want to make a wrapper of this library. I don't want to install it into /usr/local since "myboo" is not a major module. Additionally it is recommended that I build "myboo" not as a dynamic library but as a static library.

I make custom Setup.py to build "myboo";

main :: IO ()
main = defaultMainWithHooks simpleUserHooks {
           preBuild = \a b -> makeLib a b >> preBuild simpleUserHooks a b
           }

makeLib :: Args -> BuildFlags -> IO ()
makeLib _ flags = do
  let verbosity = fromFlag $ buildVerbosity flags
  cflags <- lookupEnv "CFLAGS" >>= return . maybe "" id
  setEnv "CFLAGS" $ "-fPIC" ++ (' ' : cflags)
  rawSystemExit verbosity "env" ["make", "--directory=myboo", "libmyboo.a"]

And I arrange myboo.cabal to link my haskell codes to C library;

library
  exposed-modules:     MyBoo
  build-depends:       base >=4.7 && <4.8
  hs-source-dirs:      src
  default-language:    Haskell2010
  include-dirs: myboo
  extra-libraries: myboo
  extra-lib-dirs: myboo

When I run "cabal build", I got following messages.

myboo-0.1.0.0: library-dirs: myboo is a relative path which makes no sense (as
there is nothing for it to be relative to). You can make paths relative to the
package database itself by using ${pkgroot}. (use --force to override)

If I write "extra-lib-dirs: /absolute/path/to/working/dir/myboo", it seems that it works well. But it's not good way because /absolute/... is just a working directory.

How should I fix above error messages? My environment is here;

% ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.8.2
% cabal --version
cabal-install version 1.20.0.2
using version 1.20.0.0 of the Cabal library
% cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"

解决方案

You can write your own Setup.hs and setup Distribution.Simple.confHook. In your hook function, modify Distribution.PackageDescription.extraLibDirs to include the directory.

Note that you also need to change the build-type to Custom in your cabal file.

Here is a link to Setup.hs in which I did what I wrote.

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