Pull in namespace.h when building all .c files using gcc's -include option,

so that we can provide asm labels for the memcpy/memset/__stack_smash_handler
calls that it generates ab initio.  Eliminate direct #includes of it.  Make
sure it's a dependency of all objects (unnecessary for asm, but close enough).

ok deraadt@

2 files changed, 18 insertions, 3 deletions

diff --git a/src/lib/libc/include/namespace.h b/src/lib/libc/include/namespace.h
index 939515251e..c8c864a266 100644
--- a/src/lib/libc/include/namespace.h
+++ b/src/lib/libc/include/namespace.h
@@ -1,4 +1,4 @@
-/*      $OpenBSD: namespace.h,v 1.5 2015/09/06 20:26:20 guenther Exp $  */
+/*      $OpenBSD: namespace.h,v 1.6 2015/09/10 18:13:46 guenther Exp $  */
 
 #ifndef _LIBC_NAMESPACE_H_
 #define _LIBC_NAMESPACE_H_
@@ -126,6 +126,8 @@
  *      ex: DEF_SYS(pread)
  */
 
+#include <sys/cdefs.h>  /* for __dso_hidden and __{weak,strong}_alias */
+
 #define HIDDEN(x)               _libc_##x
 #define CANCEL(x)               _libc_##x##_cancel
 #define WRAP(x)                 _libc_##x##_wrap
@@ -144,5 +146,19 @@
 #define DEF_WRAP(x)             __weak_alias(x, WRAP(x))
 #define DEF_SYS(x)              __strong_alias(_thread_sys_##x, HIDDEN(x))
 
+
+/*
+ * gcc will generate calls to the functions below.
+ * Declare and redirect them here so we always go
+ * directly to our hidden aliases.
+ */
+#include <sys/_types.h>
+void    *memcpy(void *__restrict, const void *__restrict, __size_t);
+void    *memset(void *, int, __size_t);
+void    __stack_smash_handler(const char [], int __attribute__((__unused__)));
+PROTO_NORMAL(memcpy);
+PROTO_NORMAL(memset);
+PROTO_NORMAL(__stack_smash_handler);
+
 #endif  /* _LIBC_NAMESPACE_H_ */
 
diff --git a/src/lib/libc/stdlib/hcreate.c b/src/lib/libc/stdlib/hcreate.c
index d0a377010e..cb547a8d36 100644
--- a/src/lib/libc/stdlib/hcreate.c
+++ b/src/lib/libc/stdlib/hcreate.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: hcreate.c,v 1.5 2014/08/10 02:15:18 guenther Exp $    */
+/*      $OpenBSD: hcreate.c,v 1.6 2015/09/10 18:13:46 guenther Exp $    */
 /*      $NetBSD: hcreate.c,v 1.5 2004/04/23 02:48:12 simonb Exp $       */
 
 /*
@@ -47,7 +47,6 @@
  * nobody had a copy in the office, so...
  */
 
-#include "namespace.h"
 #include <assert.h>
 #include <errno.h>
 #include <stdint.h>