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New instructions for building nvim in Windows

[WIP]

Windows/MSYS2

In Windows we build using the toolchain provided by MSYS2 - the resulting binaries DO NOT link against the MSYS2 runtime.

Start by installing the necessary dependencies

pacman -S mingw-w64-x86_64-gcc mingw-w64-x86_64-libtool mingw-w64-x86_64-cmake \
mingw-w64-x86_64-make mingw-w64-x86_64-perl mingw-w64-x86_64-python2 \
mingw-w64-x86_64-pkg-config mingw-w64-x86_64-unibilium gperf

Building in cmd.exe

Set your PATH to include the mingw64 tools

set PATH=c:\msys64\mingw64\bin;%PATH%

The following is not always required, but sometimes mingw32-make fails to invoke the correct compiler

set CC=gcc

Build using the MinGW Makefiles generator

mkdir .deps
cd .deps
cmake  -G "MinGW Makefiles" ..\third-party\
mingw32-make
cd ..
mkdir build
cd build
cmake -G "MinGW Makefiles" -DGPERF_PRG="C:\msys64\usr\bin\gperf.exe" ..
mingw32-make

Building inside the MSYS2 MinGW64 shell

To build from inside the MinGW64 shell install mingw64-x86_64-lua51-mpack and use the MSYS Makefiles generator.

mkdir .deps
cd .deps
cmake -G "MSYS Makefiles" -DUSE_BUNDLED_LUAROCKS=NO ../third-party
make
cd ..
mkdir build
cd build
cmake -G "MSYS Makefiles" ..
make

Currently there is no way to run tests and some development tasks inside the MSYS2 shell, because .bat files cannot be executed there, and path conversions do not work well with some of the lua tools.

mingw and python greenlet

see https://github.com/python-greenlet/greenlet/issues/20

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