mingw32 build with MSVCR80 about luafilesystem

[1linux]

How to solve the problem "unknown _findfirst" issue with luafilesystem / luarocks / mingw+MSVCR80

Background:
Starting with MSVCR71 Microsoft renamed a lot of routines for the sake of compatibility with 32/64 Windows.

luafilesystem (as of version 1.6.2) still uses the old "MSVCRT.dll" 32 Bit routines.

Current "luarocks" for Windows however uses MSVCR80.dll (as of November 2013)

So if you have a build environment with current luarocks and mingw32, you have the problem that luafilesystem is also built against MSVCR80.dll - and your lua program will fail using any of the lfs-functions.

The solution ist very simple: Don´t use MSVCR80.

The way ist not too hard. The caveat is: You cannot use the simple "luarocks install luafilesystem".
You have to do it by hand.

The way:

Start a Windows Command processor (cmd.exe)
Say "luarocks install luafilesystem"
-> Now you have a lfs.dll which does not work mit your installation (try it - if it works hooray you are done).

Otherwise continue:
Say "luaroks unpack luafilesystem"
-> luarocks fetches luafilesystem from the repo
Say "cd luafilesystem-1.6.2-1"
Say "cd luafilesystem-1.6.2"
Say "luarocks make"
-> It builds everything and installs it to your luarocks directory (still not functionning)
-> It builds with the following command:
mingw32-gcc -shared -o lfs.dll src/lfs.o c:/users/public/lua/LuaRocks/2.1/lua5.1.lib -lMSVCR80
-> "-lMSVCR80" is the enemy - it forces mingw32 to link against MSVCR80.dll
-> So take the same line without it:
Say "mingw32-gcc -shared -o lfs.dll src/lfs.o c:/users/public/lua/LuaRocks/2.1/lua5.1.lib"
Now there is a "lfs.dll" with around 64kb. Copy this dll to your lua installation directory

If size is a concern, you can make lfs.dll even smaller:
Say "strip lfs.dll"
-> Now around 19kb

If there is any better way, please tell!

Regards
Helmut