如何在 Windows 10 下使用 hmatrix 正确构建 cabal 项目？

Question

使用 Windows 10 64 位，Cabal-3.4.0.0，ghc-8.10.7。我使用命令在 MSYS2 环境中安装了 OpenBLAS pacman -S mingw-w64-x86_64-openblas。然后，我用命令

成功安装了hmatrix-0.20.2

cabal install --lib hmatrix --flags=openblas --extra-include-dirs="C:\ghcup\msys64\mingw64\include\OpenBLAS" --extra-lib-dirs="C:\ghcup\msys64\mingw64\bin" --extra-lib-dirs="C:\ghcup\msys64\mingw64\lib"

我正在尝试使用 cabal build cabalhmatrix 和 Main

构建简单的测试项目

module Main where

import Numeric.LinearAlgebra

main :: IO ()
main = do
  putStrLn $ show $ vector [1,2,3] * vector [3,0,-2]

但现在我得到了输出

Resolving dependencies...
Build profile: -w ghc-8.10.7 -O1
In order, the following will be built (use -v for more details):
- hmatrix-0.20.2 (lib) (requires build)
- cabalhmatrix-0.1.0.0 (exe:cabalhmatrix) (first run)
Starting     hmatrix-0.20.2 (lib)

Failed to build hmatrix-0.20.2. The failure occurred during the configure
step.
Build log (
C:\cabal\logs\ghc-8.10.7\hmatrix-0.20.2-6dd2e8f2795550e4dd624770ac98c326dacc0cac.log
):
Warning: hmatrix.cabal:21:28: Packages with 'cabal-version: 1.12' or later
should specify a specific version of the Cabal spec of the form
'cabal-version: x.y'. Use 'cabal-version: 1.18'.
Configuring library for hmatrix-0.20.2..
cabal-3.4.0.0.exe: Missing dependencies on foreign libraries:
* Missing (or bad) C libraries: blas, lapack
This problem can usually be solved by installing the system packages that
provide these libraries (you may need the "-dev" versions). If the libraries
are already installed but in a non-standard location then you can use the
flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are.If
the library files do exist, it may contain errors that are caught by the C
compiler at the preprocessing stage. In this case you can re-run configure
with the verbosity flag -v3 to see the error messages.

cabal-3.4.0.0.exe: Failed to build hmatrix-0.20.2 (which is required by
exe:cabalhmatrix from cabalhmatrix-0.1.0.0). See the build log above for
details.

我应该怎么做才能正确构建该包？我想我需要在编译期间以某种方式将参数 --flags=openblas --extra-include-dirs="C:\ghcup\msys64\mingw64\include\OpenBLAS" --extra-lib-dirs="C:\ghcup\msys64\mingw64\bin" --extra-lib-dirs="C:\ghcup\msys64\mingw64\lib" 传递给 hmatrix，但不知道该怎么做。老实说，我不明白这些参数（cabal、ghc、ghc-pkg 或其他）究竟是为了什么程序，以及为什么 cabal 试图再次安装 hmatrix。我在目录 "C:\cabal\store\ghc-8.10.7\hmatrix-0.20.2-e917eca0fc7690010007a19f4f2a3602d86df0f0".

中看到 hmatrix

已创建 cabal.project 文件：

packages: .

package hmatrix
  flags: +openblas
  extra-include-dirs: C:\ghcup\msys64\mingw64\include\OpenBLAS
  extra-lib-dirs: C:\ghcup\msys64\mingw64\bin, C:\ghcup\msys64\mingw64\libenter code here

将 libopenblas.dll 位置添加到 PATH 变量 cabal 项目后正在运行。

Answer 1

即使有 --lib 标志，通常最好在 Cabal 不安装库 的假设下工作。永远不要安装库，而只是依赖它——并在必要时让 Cabal 安装、更新等。

但是你怎么能传递必要的标志呢？ 有了cabal.project file.

packages: .

package hmatrix
   flags: openblas
   extra-include-dirs: C:\ghcup\msys64\mingw64\include\OpenBLAS
   ...

把这个文件和cabalhmatrix.cabal放在你自己项目的工作目录下。然后该目录中的运行 cabal build 将使用带有合适库等标志的 hmatrix 安装。

如何在 Windows 10 下使用 hmatrix 正确构建 cabal 项目？

How to correctly build cabal project using hmatrix under Windows 10?

windows

haskell

cabal

hmatrix

openblas