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Summary

This is related to #15948 (closed)

Make-based build fails on Windows with pre-existing MSYS2/MinGW toolchain. So pacman MinGW package can't be created.

Steps to reproduce

1. Install MSYS/MinGW toolchain
2. Install packages base-devel msys2-devel mingw-w64-i686-toolchain mingw-w64-x86_64-toolchain
3. Install dependencies from provided PKGBUILD through pacman

makedepends=("${MINGW_PACKAGE_PREFIX}-python3-sphinx"
             "${MINGW_PACKAGE_PREFIX}-llvm"
             'make'
             'perl')
optdepends=("${MINGW_PACKAGE_PREFIX}-llvm: use LLVM for an optimized backend")

2. git clone https://github.com/msys2/MINGW-packages.git
3. cd MINGW-packages/mingw-w64-ghc
4. makepkg-mingw -sCLf --skippgpcheck

Result:

mingw-w64-ghc-8.6.5-1-x86_64-build.log

ghc-stage1.exe: could not detect mingw toolchain

Environment

• GHC version used: 8.6.5 (still not fixed in 8.10.1 too)

Optional:

• Operating System: Windows 8.1 Enterprise 64-bit
• System Architecture:

P.S. This issue doesn't related to Happy and Alex issues anymore. See logs.