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Re: [PATCH 2/4] enhance overflow and truncation detection in strncpy and strncat (PR 81117)
On 08/14/2017 12:09 PM, Joseph Myers wrote:
On Mon, 14 Aug 2017, Martin Sebor wrote:
I assumed every attribute needed to define an identifier but
nothing broke after I removed it so it looks like you're right
variable attributes don't need one. Go figure. It would be
nice if there was a comment above the block that mentioned that.
I'll try to remember to add one separately.
builtin-attrs.def is only for attributes used in defining built-in
functions. If no built-in function uses an attribute, it should not be
defined there.
Okay, thanks for confirming that. Here's a patch to make it
clear. Please let me know if it's okay to commit.
Martin
2017-08-14 Martin Sebor <msebor@redhat.com>
* builtin-attrs.def: Add comments.
Index: gcc/builtin-attrs.def
===================================================================
--- gcc/builtin-attrs.def (revision 251097)
+++ gcc/builtin-attrs.def (working copy)
@@ -18,7 +18,9 @@ along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* This header provides a declarative way of describing the attributes
- that are applied to some functions by default.
+ that are applied to some built-in functions by default. Attributes
+ that apply to types or variables but not functions need not and
+ should not be defined here.
Before including this header, you must define the following macros.
In each case where there is an ENUM, it is an identifier used to
@@ -85,7 +87,7 @@ DEF_LIST_INT_INT (5,0)
DEF_LIST_INT_INT (5,6)
#undef DEF_LIST_INT_INT
-/* Construct trees for identifiers. */
+/* Construct trees for identifiers used in function attributes. */
DEF_ATTR_IDENT (ATTR_ALLOC_SIZE, "alloc_size")
DEF_ATTR_IDENT (ATTR_COLD, "cold")
DEF_ATTR_IDENT (ATTR_CONST, "const")