使用 Stack 构建包 regex-posix-0.96.0.0 时出错

Question

我正在尝试使用 Stack 编译一个新的 Haskell 项目，但我收到此错误消息：

$ stack build
WARNING: Ignoring regex-posix's bounds on base (<0 && >=4.3 && <4.16); using base-4.14.1.0.
Reason: trusting snapshot over cabal file dependency information.
regex-posix                 > configure
regex-posix                 > Configuring regex-posix-0.96.0.0...
regex-posix                 > build
regex-posix                 > Preprocessing library for regex-posix-0.96.0.0..
regex-posix                 > compiling .stack-work\dist4b403a\build\Text\Regex\Posix\Wrap_hsc_make.c failed (exit code 1)
regex-posix                 > rsp file was: ".stack-work\dist\274b403a\build\Text\Regex\Posix\hsc5BFC.rsp"
regex-posix                 > command was: C:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\ghc-8.10.4\lib\../mingw/bin\gcc.exe -c .stack-work\dist4b403a\build\Text\Regex\Posix\Wrap_hsc_make.c -o .stack-work\dist4b403a\build\Text\Regex\Posix\Wrap_hsc_make.o -D__GLASGOW_HASKELL__=810 -Dmingw32_BUILD_OS=1 -Dx86_64_BUILD_ARCH=1 -Dmingw32_HOST_OS=1 -Dx86_64_HOST_ARCH=1 -Icbits -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\include -I.stack-work\dist4b403a\build\cbits -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\include -I.stack-work\dist4b403a\build\autogen -I.stack-work\dist4b403a\build\global-autogen -include .stack-work\dist4b403a\build\autogen\cabal_macros.h -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\msys2-20180531\mingw64\include -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\ghc-8.10.4\lib\bytestring-0.10.12.0\include -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\ghc-8.10.4\lib\base-4.14.1.0\include -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\ghc-8.10.4\lib\integer-gmp-1.0.3.0\include -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\ghc-8.10.4\lib/include -IC:\Users\mark\AppData\Local\Programs\stack\x86_64-windows\ghc-8.10.4/lib/include/
regex-posix                 > error: Wrap.hsc:96:10: fatal error: regex.h: No such file or directory
regex-posix                 > compilation terminated.
regex-posix                 >
Progress 1/2

--  While building package regex-posix-0.96.0.0 (scroll up to its section to see the error) using:
      C:\sr\setup-exe-cache\x86_64-windows\Cabal-simple_Z6RU0evB_3.2.1.0_ghc-8.10.4.exe --builddir=.stack-work\dist4b403a build --ghc-options " -fdiagnostics-color=always"
    Process exited with code: ExitFailure 1

我不明白最初的警告。在查看 regex-posix package 的依赖项时，它确实将 base (>=4.3 && <4.16) 列为依赖项，但是 <0 来自哪里？

我在 stack.yaml 中将解析器设置为 LTS 18.0:

resolver: lts-18.0

根据documentation of LTS 18.0，它使用base-4.14.1.0。如果版本控制是字典序的，我认为 4.14.1.0 符合 regex-posix 要求的范围（如果我们暂时忽略奇怪的 <0约束）。

以下是我的package.yaml的相关部分：

dependencies:
- base >= 4.7 && < 5
- regex-posix >= 0.96

library:
  source-dirs: src
  ghc-options:
  - -Wall

我的stack版本：

$ stack --version
Version 2.7.1, Git revision 8afe0c2932716b0441cf4440d6942c59568b6b19 x86_64 hpack-0.34.4

我在 Windows 10.

FWIW，我并不是很关心 regex-posix 本身。实际上，我正在尝试设置一个测试项目，并且 test-framework 取决于 regex-posix.

如何解决这个问题以便我可以编译我的代码？

Answer 1

错误与版本无关，这只是一个警告。真正的错误是关于底层 C 库缺少“regex.h”header。 header 几乎总是出现在 posix 平台上（比如 linux），但不出现在 Windows 上。参见 https://github.com/haskell-hvr/regex-posix/issues/4

特别是 Paul Johnson 的 this comment：

Correction to the above: you don't need mingw64. You just need to install with the _regex-posix-clib flag enabled (note the underscore).

With plain cabal: cabal install regex-posix -f _regex-posix-clib

In Stack, add the following to your stack.yaml:
extra-deps:
   - regex-posix-clib-2.7

flags:
   regex-posix:
      _regex-posix-clib: true

在该线程中还有关于 <0 版本的评论：https://github.com/haskell-hvr/regex-posix/issues/4#issuecomment-699786233

使用 Stack 构建包 regex-posix-0.96.0.0 时出错

Error building package regex-posix-0.96.0.0 with Stack

haskell

haskell-stack