Question

我想用一个包剪裁器http://hackage.haskell.org/package/clipper来检测复杂多边形的交集。它是C ++包的FFI。如果你运行

，它可以正常工作

cabal build --with-gcc=/usr/bin/g++

但不是。有没有办法将gcc选项放入cabal文件中，或者让我的堆栈项目用g ++构建依赖项？

出于某种原因设置$ PATH不起作用：

%  cabal build --with-gcc=g++
Building clipper-0.0.1...
Preprocessing library clipper-0.0.1...
[1 of 1] Compiling Algebra.Clipper  ( dist/build/Algebra/Clipper.hs, dist/build/Algebra/Clipper.o )
In-place registering clipper-0.0.1...

%  PATH=$(pwd):$PATH gcc
g++: fatal error: no input files
compilation terminated.

%  PATH=$(pwd):$PATH cabal build 
Building clipper-0.0.1...
Preprocessing library clipper-0.0.1...
In file included from Clipper.hsc:27:0:
cbits/clipper.hpp:29:18: fatal error: vector: Dosiero aŭ dosierujo ne ekzistas
compilation terminated.
compiling dist/build/Algebra/Clipper_hsc_make.c failed (exit code 1)
command was: /usr/bin/gcc -c dist/build/Algebra/Clipper_hsc_make.c -o dist/build/Algebra/Clipper_hsc_make.o -fno-stack-protector -D__GLASGOW_HASKELL__=710 -Dlinux_BUILD_OS=1 -Dx86_64_BUILD_ARCH=1 -Dlinux_HOST_OS=1 -Dx86_64_HOST_ARCH=1 -Icbits -Idist/build/autogen -include dist/build/autogen/cabal_macros.h -I/usr/local/haskell/ghc-7.10.2-x86_64/lib/ghc-7.10.2/base_GDytRqRVSUX7zckgKqJjgw/include -I/usr/local/haskell/ghc-7.10.2-x86_64/lib/ghc-7.10.2/integ_2aU3IZNMF9a7mQ0OzsZ0dS/include -I/usr/local/haskell/ghc-7.10.2-x86_64/lib/ghc-7.10.2/include -I/usr/local/haskell/ghc-7.10.2-x86_64/lib/ghc-7.10.2/include/

同样，根据以下@ErikR的建议更改Setup.hs并没有帮助。

% runghc Setup.hs build
"Hello, I am running"
fomg
BuildFlags
  { buildProgramPaths = []
  , buildProgramArgs = []
  , buildDistPref = Flag "dist"
  , buildVerbosity = Flag Normal
  , buildNumJobs = NoFlag
  , buildArgs = []
 }
fimg
BuildFlags
  { buildProgramPaths = [ ( "gcc" , "/usr/bin/g++" ) ]
  , buildProgramArgs = []
  , buildDistPref = Flag "dist"
  , buildVerbosity = Flag Normal
  , buildNumJobs = NoFlag
  , buildArgs = []
  }
Building clipper-0.0.1...
Preprocessing library clipper-0.0.1...
In file included from Clipper.hsc:27:0:
(etc)

请注意，它在buildHook行崩溃，所以为了打印标记我需要更改顺序。

Answer 1

尝试这个更简单的自定义Setup.hs文件：

import Distribution.Simple
import System.Environment

main = do
  args <- getArgs
  defaultMainArgs $ ["--with-gcc=c++"] ++ args

原始答案

一些想法：

（1）创建一个名为gcc的包装器脚本，调用g++。将脚本尽早放入PATH中，以便运行gcc来运行脚本而不是真正的gcc。也许只有在构建clipper包时才有这个包装脚本。

（2）编写自定义Setup.hs。

将clipper.cabal文件中的build-type字段修改为Custom，而不是Simple

将Setup.hs文件替换为：

import Distribution.Simple
import Distribution.Simple.Setup
import Distribution.Simple.LocalBuildInfo
import Distribution.PackageDescription
import Text.Show.Pretty

main = do
  let hooks = simpleUserHooks

      myBuild :: PackageDescription -> LocalBuildInfo -> UserHooks -> BuildFlags -> IO ()
      myBuild pkgd buildinfo uhooks flags = do
        putStrLn $ ppShow flags
        let flags' = flags { buildProgramPaths = [("gcc","g++")] ++ (buildProgramPaths flags) }
        buildHook hooks pkgd buildinfo uhooks flags'
        putStrLn $ ppShow flags'
      hooks' = hooks { buildHook = myBuild }

  defaultMainWithHooks hooks'

注意：不需要导入Text.Show.Pretty，因此如果您没有安装它，可以删除它和ppShow调用。

上述Setup.hs与使用--with-gcc=g++调用cabal具有相同的效果。

使用c ++和stack / cabal编译Haskell包

1 个答案: