[PATCH] __attribute__((fallthrough)) can't simply be ignored

[Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>]

Currently, sparse has the attribute 'fallthrough' in its list of
known-but-ignored attributes (like almost every GCC's attributes).

But this attribute is a statement attribute, something which is
currently not supported (it's interpreted as the attribute of an empty
declaration which doesn't play well with -Wdeclaration-after-statement).

Fix this by stopping to consider this attribute as known. This will
allow __has_attribute(fallthrough) to correctly play its role.

Note: a more complete solution will need to parse this statement
      attribute and maybe be able to make the distinction between
      statement attributes, label attributes (also currently ignored),
      and type, function & variable attributes.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
 gcc-attr-list.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/gcc-attr-list.h b/gcc-attr-list.h
index 9acb982fd..ae0b611fb 100644
--- a/gcc-attr-list.h
+++ b/gcc-attr-list.h
@@ -47,7 +47,6 @@ GCC_ATTR(error)
 GCC_ATTR(exception)
 GCC_ATTR(exception_handler)
 GCC_ATTR(externally_visible)
-GCC_ATTR(fallthrough)
 GCC_ATTR(far)
 GCC_ATTR(fast_interrupt)
 GCC_ATTR(fastcall)
-- 
2.19.0