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Add configure option to disable stack protector.

--- a/configure.ac

+++ b/configure.ac

@@ -209,7 +209,18 @@

 CFLAGS="$saved_CFLAGS $SYMBOL_VISIBILITY"

 AC_SUBST(SYMBOL_VISIBILITY)

-if test $ac_cv_c_compiler_gnu = yes ; then

+ac_build_stack_protector=yes

+AC_ARG_ENABLE(stack-protector,

+     AS_HELP_STRING([--disable-stack-protector],[Disable compiler stack hardening]),

+     [

+       if test "x$enableval" = "xno"; then

+         ac_build_stack_protector=$enableval

+       fi

+     ], [

+       ac_build_stack_protector=yes

+     ])

+if test "x$ac_build_stack_protector" = "xyes"; then

+if test "x$ac_cv_c_compiler_gnu" = "xyes" ; then

 saved_CFLAGS="$CFLAGS"

 CFLAGS="$CFLAGS -fstack-protector-all"

 AC_MSG_CHECKING([if ${CC} supports -fstack-protector-all])

@@ -218,6 +229,7 @@

         STACK_PROTECTOR="-fstack-protector-all" ],

         AC_MSG_RESULT([no]))

 CFLAGS="$saved_CFLAGS $STACK_PROTECTOR"

+fi

 fi

 CFLAGS="$CFLAGS -W"