1 files changed, 49 insertions, 0 deletions
diff --git a/winsup/configure.cygwin b/winsup/configure.cygwin
new file mode 100755
index 000000000..6c4d08e30
--- /dev/null
+++ b/winsup/configure.cygwin
@@ -0,0 +1,49 @@
+addto_CPPFLAGS() {
+    local f
+    for f; do
+	case " $CPPFLAGS " in
+	    *\ $f\ *) ;;
+	    *) CPPFLAGS="$CPPFLAGS $f" ;;
+	esac
+    done
+}
+
+realdirpath() {
+    [ -z "$1" ] && return 1
+    (cd "$1" 2>/dev/null && pwd)
+    if test $? -ne 0; then
+	return 1
+    else
+	return 0
+    fi
+}
+
+for d in . .. ../.. ../../..; do
+    if test -e "$srcdir/$d/configure.cygwin"; then
+	winsup_srcdir=$(realdirpath "$srcdir/$d")
+	break
+    fi
+done
+
+if test -z "$winsup_srcdir"; then
+    echo "cannot find directory containing configure.cygwin" 1>&2
+    exit 1
+fi
+
+case "$srcdir" in
+    */newlib*)	lookfor=newlib ;;
+    */winsup*)	lookfor=winsup ;;
+    *)		lookfor=. ;;
+esac
+
+for d in . .. ../.. ../../..; do
+    if test -d "$d/$lookfor"; then
+	target_builddir=$(realdirpath "$d")
+	break
+    fi
+done
+
+if test -z "$target_builddir"; then
+    echo "cannot determine top build dir, looking for $lookfor" 1>&2
+    exit 1
+fi