hurd: Fix static-PIE startup

hurd initialization stages use RUN_HOOK to run various initialization
functions.  That is however using absolute addresses which need to be
relocated, which is done later by csu.  We can however easily make the
linker compute relative addresses which thus don't need a relocation.
The new SET_RELHOOK and RUN_RELHOOK macros implement this.

1 files changed, 4 insertions, 4 deletions

diff --git a/sysdeps/mach/hurd/brk.c b/sysdeps/mach/hurd/brk.c
index a4294b9eae..088c99b2c8 100644
--- a/sysdeps/mach/hurd/brk.c
+++ b/sysdeps/mach/hurd/brk.c
@@ -21,6 +21,8 @@
 #include <lock-intern.h>	/* For `struct mutex'.  */
 #include <vm_param.h>
 
+#include "set-hooks.h"
+
 
 /* Initial maximum size of the data segment (this is arbitrary).  */
 #define	DATA_SIZE	(128 * 1024 * 1024)
@@ -130,7 +132,7 @@ _hurd_set_brk (vm_address_t addr)
   return 0;
 }
 
-static void
+static void attribute_used_retain
 init_brk (void)
 {
   vm_address_t pagend;
@@ -160,7 +162,5 @@ init_brk (void)
 	/* Couldn't allocate the memory.  The break will be very short.  */
 	_hurd_data_end = pagend;
     }
-
-  (void) &init_brk;		/* Avoid ``defined but not used'' warning.  */
 }
-text_set_element (_hurd_preinit_hook, init_brk);
+SET_RELHOOK (_hurd_preinit_hook, init_brk);