Add mingw64 build file so that we can track it.

support/BUILD-MINGW64.sh

@@ -0,0 +1,65 @@
+rm -rf mingw64
+
+rm -rf double-mingw64
+mkdir double-mingw64
+cd double-mingw64
+../configure --prefix=`pwd`/../mingw64 --host=x86_64-w64-mingw32 --with-gcc-arch=nocona --enable-portable-binary --disable-alloca --with-our-malloc16 --with-windows-f77-mangling --enable-shared --disable-static --enable-threads --with-combined-threads --enable-sse2 && make -j4 && make install
+cp -f tests/.libs/bench.exe `pwd`/../mingw64/bin/bench.exe
+cd ..
+
+rm -rf single-mingw64
+mkdir single-mingw64
+cd single-mingw64
+../configure --prefix=`pwd`/../mingw64 --host=x86_64-w64-mingw32 --with-gcc-arch=nocona --enable-portable-binary --disable-alloca --with-our-malloc16 --with-windows-f77-mangling --enable-shared --disable-static --enable-threads --with-combined-threads --enable-sse --enable-float && make -j4 && make install
+cp -f tests/.libs/bench.exe `pwd`/../mingw64/bin/benchf.exe
+cd ..
+
+rm -rf ldouble-mingw
+mkdir ldouble-mingw
+cd ldouble-mingw
+../configure --prefix=`pwd`/../mingw64 --host=x86_64-w64-mingw32 --with-gcc-arch=nocona --enable-portable-binary --disable-alloca --with-our-malloc16 --with-windows-f77-mangling --enable-shared --disable-static --enable-threads --with-combined-threads --enable-long-double && make -j4 && make install
+cp -f tests/.libs/bench.exe `pwd`/../mingw64/bin/benchl.exe
+cd ..
+
+cd mingw64/bin
+for dll in *.dll; do
+    def=`basename $dll .dll`.def
+    echo "LIBRARY $dll" > $def
+    echo EXPORTS >> $def
+    x86_64-w64-mingw32-nm $dll | grep ' T _' | sed 's/.* T _//' | grep fftw >> $def
+done
+cd ../..
+
+perl -pi -e 's,^ * #define FFTW_DLL,*/\n#define FFTW_DLL\n/*,' mingw64/include/fftw3.h
+
+cat > README-WINDOWS <<EOF
+This .zip archive contains DLL libraries and the associated header (.h)
+and module-definition (.def) files of FFTW compiled for Win32.  It
+also contains the corresponding bench.exe test/benchmark programs
+and wisdom utilities.
+
+There are three libraries: single precision (float), double precision,
+and extended precision (long double).  To use the third library,
+your compiler must have sizeof(long double) == 12.
+
+In order to link to these .dll files from Visual C++, you need to
+create .lib "import libraries" for them, and can do so with the "lib"
+command that comes with VC++.  In particular, run:
+     lib /machine:i386 /def:libfftw3-3.def
+     lib /machine:i386 /def:libfftw3f-3.def
+     lib /machine:i386 /def:libfftw3l-3.def
+
+The single- and double-precision libraries use SSE and SSE2, respectively,
+but should also work on older processors (the library checks at runtime
+to see whether SSE/SSE2 is supported and disables the relevant code if not).
+
+They were compiled by the GNU C compiler for MinGW, specifically:
+EOF
+x86_64-w64-mingw32-gcc --version |head -1 >> README-WINDOWS
+cp -f tests/README README-bench
+
+fftw_vers=`grep PACKAGE_VERSION double-mingw64/config.h |cut -d" " -f3 |tr -d \"`
+zip=fftw-${fftw_vers}-dll64.zip
+rm -f $zip
+zip -vj $zip mingw64/bin/*.dll mingw64/bin/*.exe
+zip -vjgl $zip mingw64/bin/*.def mingw64/include/* README COPYING COPYRIGHT NEWS README-WINDOWS README-bench