如何在Windows 10环境下使用hmatrix正确构建阴谋项目？

Question

使用Windows 10 64位，Cabal-3.4.0.0，ghc-8.10.7.我用命令OpenBLAS在MSYS2环境中安装了pacman -S mingw-w64-x86_64-openblas。，我成功地用命令安装了hmart-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Main使用cabal build cabalhmatrix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]

但现在我得到了产出

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.

我该怎么做才能正确地构建这个包？我想我需要在编译过程中以某种方式将参数--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，但不知道如何做到这一点。老实说，我不明白这些争论究竟是什么程序(阴谋、ghc、ghc或其他什么)，以及为什么阴谋集团要再次安装hmatrix。我在"C:\cabal\store\ghc-8.10.7\hmatrix-0.20.2-e917eca0fc7690010007a19f4f2a3602d86df0f0"目录中看到了hmatrix。

创建的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

在向libopenblas.dll添加PATH位置之后，变量阴谋项目就开始工作了。

Answer 1

即使存在--lib标志，通常最好在假定Cabal不安装库的情况下工作。永远不要安装一个库，而只是依赖它-和让Cabal安装，更新等，只要有必要。

但是你怎么能传递必要的旗帜呢？用 。

packages: .

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

将该文件与cabalhmatrix.cabal一起放在您自己项目的工作目录中。然后，在该目录中运行cabal build将使用带有适当库等标志的hmatrix安装。