[PATCH] lib: work around talloc_steal usage from C++ code

[Jani Nikula <jani@nikula.org>]

Implicit typecast from 'void *' to 'T *' is okay in C, but not in
C++. In talloc_steal, an explicit cast is provided for type safety in
some GCC versions. Otherwise, a cast is required. Provide a template
function for this to maintain type safety, and redefine talloc_steal
to use it.

The template must be outside the extern "C" block (NOTMUCH_BEGIN_DECLS
and NOTMUCH_END_DECLS), but keep it within the GCC visibility #pragma.

No functional changes, apart from making the library build with
compilers other than recent GCC.

Signed-off-by: Jani Nikula <jani@nikula.org>

---

For background, see discussion starting at
id:"1333966665-10469-5-git-send-email-Vladimir.Marek@oracle.com"

Vladimir, please test this. Thanks.
---
 lib/notmuch-private.h |   22 ++++++++++++++++++++--
 1 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/lib/notmuch-private.h b/lib/notmuch-private.h
index ea836f7..3886e0c 100644
--- a/lib/notmuch-private.h
+++ b/lib/notmuch-private.h
@@ -495,8 +495,26 @@ notmuch_filenames_t *
 _notmuch_filenames_create (const void *ctx,
 			   notmuch_string_list_t *list);
 
-#pragma GCC visibility pop
-
 NOTMUCH_END_DECLS
 
+#ifdef __cplusplus
+/* Implicit typecast from 'void *' to 'T *' is okay in C, but not in
+ * C++. In talloc_steal, an explicit cast is provided for type safety
+ * in some GCC versions. Otherwise, a cast is required. Provide a
+ * template function for this to maintain type safety, and redefine
+ * talloc_steal to use it.
+ */
+#if !(__GNUC__ >= 3)
+template <class T> T *
+_notmuch_talloc_steal (const void *new_ctx, const T *ptr)
+{
+    return static_cast<T *> (talloc_steal (new_ctx, ptr));
+}
+#undef talloc_steal
+#define talloc_steal _notmuch_talloc_steal
+#endif
+#endif
+
+#pragma GCC visibility pop
+
 #endif
-- 
1.7.5.4