@echo off

set list=
set list=%list% global.h
set list=%list% MyFunction.c

set path_32=C:\MinGW32\bin\
set path_64=C:\MinGW64\bin\
set dll_32=.\MyCustomDll_x86.dll
set dll_64=.\MyCustomDll_x64.dll
echo ==================================================================================
if exist %dll_32% ( attrib -h -r -s %dll_32% )
if exist %dll_64% ( attrib -h -r -s %dll_64% )

echo Compiling DLL-32bits
%path_32%gcc.exe -O2 -lm -mdll -m32 %list% -o %dll_32%

echo Compiling DLL-64bits
%path_64%x86_64-w64-mingw32-gcc.exe -O2 -lm -mdll -m64 %list% -o %dll_64%
echo ==================================================================================