Introduce <pointer_guard.h>, extracted from <sysdep.h>

This allows us to define a generic no-op version of PTR_MANGLE and
PTR_DEMANGLE.  In the future, we can use PTR_MANGLE and PTR_DEMANGLE
unconditionally in C sources, avoiding an unintended loss of hardening
due to missing include files or unlucky header inclusion ordering.

In i386 and x86_64, we can avoid a <tls.h> dependency in the C
code by using the computed constant from <tcb-offsets.h>.  <sysdep.h>
no longer includes these definitions, so there is no cyclic dependency
anymore when computing the <tcb-offsets.h> constants.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/wcsmbs/wctob.c b/wcsmbs/wctob.c
index 573c2c9448..5dfbd7ab7e 100644
--- a/wcsmbs/wctob.c
+++ b/wcsmbs/wctob.c
@@ -22,7 +22,7 @@
 #include <wchar.h>
 #include <wcsmbsload.h>
 
-#include <sysdep.h>
+#include <pointer_guard.h>
 
 
 int