https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108231
Bug ID: 108231
Summary: g++ mistakenly reports ambiguity between equivalent
function declarations
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bruno at clisp dot org
Target Milestone: ---
Created attachment 54156
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54156&action=edit
test case
The attached code, i1.cc, contains two equivalent function declarations for the
function 'free'. They are equivalent because they have the same signature and
both have "C" linkage.
In lines 9, 10, 12, 13, referencing the function 'free' works fine.
However, referencing it in line 17, as part of a
__attribute__ ((__malloc__ (free, 1)))
attribute, leads to an error "‘malloc’ attribute argument 1 is ambiguous".
I would expect no error, no warning.
How to reproduce:
$ g++ -S i1.cc
i1.cc:17:67: error: ‘malloc’ attribute argument 1 is ambiguous
17 | __attribute__ ((__malloc__)) __attribute__ ((__malloc__ (free, 1)));
| ^
i1.cc:17:67: note: use a cast to the expected type to disambiguate
