Question

我在Arch，ghc 8.2.1和cabal 2.0上有最新的软件包，尝试使用cabal构建ncurses软件包：

$ cabal configure
Resolving dependencies...
Configuring ncurses-0.2.16...
$ cabal build
Preprocessing library for ncurses-0.2.16..
Building library for ncurses-0.2.16..

<no location info>: error:
    module ‘UI.NCurses’ cannot be found locally

所述模块是我正在尝试构建的包的一部分，其源文件位于lib目录中。似乎在cabal文件中指定了所有内容，但为什么它无法找到它？

我尝试使用runhaskell构建它，但是遇到了同样的错误。

部分文件：

extra-source-files:
  cbits/hsncurses-shim.c
  cbits/hsncurses-shim.h
  cbits/mavericks-c2hs-workaround.h

source-repository head
  type: git
  location: https://john-millikin.com/code/haskell-ncurses/

source-repository this
  type: git
  location: https://john-millikin.com/code/haskell-ncurses/
  tag: haskell-ncurses_0.2.16

-- Do not use default to using pkg-config to find ncurses libraries, because
-- the .pc files are missing or broken in many installations.
flag use-pkgconfig
  default: False
  manual: True
  description:
    Use pkg-config to set linker and include flags.

flag force-narrow-library
  default: False
  manual: True
  description:
    Force including and linking against ncurses instead of ncursesw. This is
    only useful on systems that have the ncursesw package installed
    incorrectly. On most systems this will cause compile- or run-time errors.
library
  hs-source-dirs: lib
  ghc-options: -Wall -O2
  include-dirs: cbits

  build-depends:
      base >= 4.6 && < 5.0
    , containers >= 0.2
    , text >= 0.7
    , transformers >= 0.2

  build-tools:
    c2hs >= 0.15

  if flag(use-pkgconfig)
    if flag(force-narrow-library)
      cc-options: -DHSNCURSES_NARROW_HEADER
      pkgconfig-depends: ncurses, panel
    else
      pkgconfig-depends: ncursesw, panelw
  else
    -- MacOS has a version of ncurses where the narrow- and wide-character
    -- builds have been merged into a single header/dylib.
    --
    -- Explicitly linking against libpthread.so fixes a build problem on
    -- platforms where the linker doesn't automatically follow dependencies.
    if os(darwin) || os(freebsd) || flag(force-narrow-library)
      cc-options: -DHSNCURSES_NARROW_HEADER
    if os(darwin) || flag(force-narrow-library)
      extra-libraries: panel ncurses pthread
    else
      extra-libraries: panelw ncursesw pthread

  c-sources: cbits/hsncurses-shim.c

  exposed-modules:
    UI.NCurses
    UI.NCurses.Panel

  other-modules:
    UI.NCurses.Enums
    UI.NCurses.Compat
    UI.NCurses.Types

Answer 1

我遇到了同样的问题。尽管安装了c2hs并且在PATH中，我依赖的库仍然无法使用相同的错误消息进行安装。

我的解决方案是在我想要构建的项目中运行cabal clean并使用cabal configure重新配置它。

我怀疑在之前的构建过程中有一个hickup，让cabal认为c2hs正常运行，在这种情况下没有。

ghc无法找到它正在尝试构建的模块

1 个答案: