Move discard_const hack to memory.hso it can be used by Samba 3.

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/util/memory.h b/lib/util/memory.h
index de01492aa2..cfc13ab836 100644
--- a/lib/util/memory.h
+++ b/lib/util/memory.h
@@ -88,6 +88,31 @@
 #define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
 #endif
 
+/**
+  this is a warning hack. The idea is to use this everywhere that we
+  get the "discarding const" warning from gcc. That doesn't actually
+  fix the problem of course, but it means that when we do get to
+  cleaning them up we can do it by searching the code for
+  discard_const.
+
+  It also means that other error types aren't as swamped by the noise
+  of hundreds of const warnings, so we are more likely to notice when
+  we get new errors.
 
+  Please only add more uses of this macro when you find it
+  _really_ hard to fix const warnings. Our aim is to eventually use
+  this function in only a very few places.
+
+  Also, please call this via the discard_const_p() macro interface, as that
+  makes the return type safe.
+*/
+#ifndef discard_const
+#define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
+#endif
+
+/** Type-safe version of discard_const */
+#ifndef discard_const_p
+#define discard_const_p(type, ptr) ((type *)discard_const(ptr))
+#endif
 
 #endif /* _SAMBA_MEMORY_H_ */