File dovecot-2.0_pie.patch of Package dovecot20

Index: configure.in
===================================================================
--- configure.in.orig
+++ configure.in
@@ -31,6 +31,15 @@ AC_ARG_ENABLE(devel-checks,
 		AC_DEFINE(DEBUG,, Build with extra debugging checks)
 	fi)
 
+AC_ARG_ENABLE(pie,
+[  --enable-pie           Enable PIE support (default)],
+  if test x$enableval = xno; then
+    want_pie=no
+  else
+    want_pie=yes
+  fi,
+  want_pie=no)
+
 AC_ARG_ENABLE(asserts,
 [  --enable-asserts        Enable asserts (default)],
 	if test x$enableval = xno; then
@@ -1678,6 +1687,28 @@ if test $want_gc != no; then
 fi
 
 dnl **
+dnl ** PIE check
+dnl **
+
+if test $want_pie = yes; then
+	AC_MSG_CHECKING([if we can use PIE])
+	# try to compile something with pie
+	old_cflags=$CFLAGS
+	CFLAGS="-pie -fPIE -DPIE -Werror"
+	AC_TRY_LINK([],,[
+		LIBS="$LIBS -pie"
+		# enforce -fPIC so all objects are compiled with it
+		CFLAGS="$old_cflags -fPIC -DPIC"
+		ac_want_pie="yes"
+	], [
+		# restore old CFLAGS
+		CFLAGS="$old_cflags"
+		ac_want_pie="no"
+	])
+	AC_MSG_RESULT($ac_want_pie)
+fi
+
+dnl **
 dnl ** userdb and passdb checks
 dnl **