hurd: fix build with -fstack-protector-strong

libmachuser and libhurduser also need stack_chk_fail_local and they do not
link against libc_nonshared.

       * mach/stack_chk_fail_local.c: New file.
       * hurd/stack_chk_fail_local.c: New file.
       * mach/Machrules ($(interface-library)-routines): Add
       stack_chk_fail_local.
       * mach/Versions (GLIBC_2.4): Add __stack_chk_fail.
       * hurd/Versions (GLIBC_2.4): Add __stack_chk_fail.

ChangeLog

@@ -1,6 +1,12 @@
 2017-08-27  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
 	* sysdeps/mach/hurd/bits/sysmacros.h: New file.
+	* mach/stack_chk_fail_local.c: New file.
+	* hurd/stack_chk_fail_local.c: New file.
+	* mach/Machrules ($(interface-library)-routines): Add
+	stack_chk_fail_local.
+	* mach/Versions (GLIBC_2.4): Add __stack_chk_fail.
+	* hurd/Versions (GLIBC_2.4): Add __stack_chk_fail.
 
 2017-08-25  H.J. Lu  <hongjiu.lu@intel.com>
 

hurd/Versions

@@ -129,6 +129,10 @@ libc {
     # functions used in macros & inline functions
     __errno_location;
   }
+  GLIBC_2.4 {
+    # functions used by RPC stubs
+    __stack_chk_fail
+  }
 
   HURD_CTHREADS_0.3 {
     # weak refs to libthreads functions that libc calls iff libthreads in use

hurd/stack_chk_fail_local.c

@@ -0,0 +1 @@
+#include <debug/stack_chk_fail_local.c>

mach/Machrules

@@ -221,7 +221,7 @@ endif
 
 ifdef interface-library
 
-$(interface-library)-routines = $(interface-routines)
+$(interface-library)-routines = $(interface-routines) stack_chk_fail_local
 extra-libs += $(interface-library)
 extra-libs-others += $(interface-library)
 

mach/Versions

@@ -54,6 +54,10 @@ libc {
     # This was always there, but not exported as it should have been.
     mig_strncpy;
   }
+  GLIBC_2.4 {
+    # functions used by RPC stubs
+    __stack_chk_fail
+  }
   GLIBC_2.23 {
     __mach_host_self_;
   }

mach/stack_chk_fail_local.c

@@ -0,0 +1 @@
+#include <debug/stack_chk_fail_local.c>