https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881
--- Comment #6 from Andrew Pinski ---
The best way to do this is to use asm instead:
extern "C" int close(int);
extern __typeof__ (close) close __attribute__ ((__warning__ ("The symbol close
refers to the system function. Use safe_close
--- Comment #5 from rguenth at gcc dot gnu dot org 2010-04-25 20:13 ---
(In reply to comment #4)
(In reply to comment #2)
It is called directly because safe_close's value is replaced in the
indirect call. Since safe_close is static and not changed in the code
at all, it is
--- Comment #1 from bruno at clisp dot org 2010-04-24 22:49 ---
Created an attachment (id=20479)
-- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20479action=view)
test case
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43881
--- Comment #2 from pinskia at gmail dot com 2010-04-24 23:12 ---
Subject: Re: New: warning attached to a function is emitted even though the
function is not being called
It is called directly because safe_close's value is replaced in the
indirect call. Since safe_close is static
--- Comment #3 from bruno at clisp dot org 2010-04-24 23:54 ---
When the line
static int (*safe_close) (int fd) = close;
is changed to
static int (*safe_close) (int fd) = ((void)0, close);
the warning also disappears, but then the generate code is suboptimal:
the variable safe_close
--- Comment #4 from bruno at clisp dot org 2010-04-24 23:58 ---
(In reply to comment #2)
It is called directly because safe_close's value is replaced in the
indirect call. Since safe_close is static and not changed in the code
at all, it is marked as read only and the initialized
