Tools: move to compiling 64-bit Windows executables

Co-authored-by: davidbuzz@gmail.com
Co-authored-by: robertlong13

cygwin has dropped 32-bit support

Tools/scripts/cygwin_build.sh

@@ -8,13 +8,22 @@
 
 set -x
 
+# TOOLCHAIN=i686-pc-cygwin
+TOOLCHAIN=x86_64-pc-cygwin
+GPP_COMPILER="${TOOLCHAIN}-g++"
+
+$GPP_COMPILER -print-sysroot
+
+SYS_ROOT=$($GPP_COMPILER -print-sysroot)
+echo "SYS_ROOT=$SYS_ROOT"
+
 git config --global --add safe.directory /cygdrive/d/a/ardupilot/ardupilot
 
 rm -rf artifacts
 mkdir artifacts
 
 (
-    python ./waf --color yes --toolchain i686-pc-cygwin --board sitl configure 2>&1
+    python ./waf --color yes --toolchain $TOOLCHAIN --board sitl configure 2>&1
     python ./waf plane 2>&1
     python ./waf copter 2>&1
     python ./waf heli 2>&1
@@ -22,8 +31,6 @@ mkdir artifacts
     python ./waf sub 2>&1
 ) | tee artifacts/build.txt
 
-i686-pc-cygwin-g++ -print-sysroot
-
 # copy both with exe and without to cope with differences
 # between windows versions in CI
 cp -v build/sitl/bin/arduplane artifacts/ArduPlane.elf.exe
@@ -38,7 +45,14 @@ cp -v build/sitl/bin/arducopter-heli artifacts/ArduHeli.elf
 cp -v build/sitl/bin/ardurover artifacts/ArduRover.elf
 cp -v build/sitl/bin/ardusub artifacts/ArduSub.elf
 
-cp -v /usr/i686-pc-cygwin/sys-root/usr/bin/*.dll artifacts/
+# Find all cyg*.dll files returned by cygcheck for each exe in artifacts
+# and copy them over
+for exe in artifacts/*.exe; do 
+    echo $exe
+    cygcheck $exe | grep -oP 'cyg[^\s\\/]+\.dll' | while read -r line; do
+      cp -v /usr/bin/$line artifacts/
+    done
+done
 
 git log -1 > artifacts/git.txt
 ls -l artifacts/