Enable more debug logging for Cygwin

Author: Your Name

.github/scripts/toolchain/build-cygwin.sh

@@ -18,6 +18,10 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$CYGWIN_BUILD_PATH/Makefile" ]]; then
                 --enable-debug \
                 --enable-debugging \
                 --disable-lto"
+            CFLAGS="$CFLAGS -DDEBUG"
+            CXXFLAGS="$CXXFLAGS -DDEBUG"
+            CFLAGS_FOR_TARGET="$CFLAGS_FOR_TARGET -DDEBUG"
+            CXXFLAGS_FOR_TARGET="$CXXFLAGS_FOR_TARGET -DDEBUG"
         fi
 
         (cd $CYGWIN_SOURCE_PATH/winsup && ./autogen.sh)
@@ -27,7 +31,10 @@ if [[ "$RUN_CONFIG" = 1 ]] || [[ ! -f "$CYGWIN_BUILD_PATH/Makefile" ]]; then
 
         # ADDED: --disable-doc
         # ADDED: --disable-dumper
-        CXXFLAGS_FOR_TARGET="-Wno-error -Wno-narrowing" \
+        CFLAGS="$CFLAGS" \
+        CXXFLAGS="$CXXFLAGS" \
+        CFLAGS_FOR_TARGET="$CFLAGS_FOR_TARGET" \
+        CXXFLAGS_FOR_TARGET="$CXXFLAGS_FOR_TARGET -Wno-error -Wno-narrowing" \
         $CYGWIN_SOURCE_PATH/configure \
             --prefix=$TOOLCHAIN_PATH \
             --build=$HOST \