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To: overseers@gcc.gnu.org
From: joris <joriswu@gmail.com>
Subject: GCC bugzilla
Message-ID: <7b76e9bc-5b62-ecc2-49cc-501c4740aada@gmail.com>
Date: Sun, 12 Mar 2017 09:46:00 -0000
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Hi,

I wanted to create a user account for GCC bugzilla in order to file a bug.

In case you have a place for such report, a summary is here :


The diagnostic -Wmaybe-uninitialized does not print the offending line 
if the offending code happens inside a function-like macro


GCC 7.0 snapshot 7.0.1 20170305 (experimental)


macros.h:

#define print_int(x) print_it("%d",(x))


code.c:

#include "macros.h"

extern void print_it(const char *fmt, int i);

void test(void)

{

   int unint;

   print_int(uninit);

}

gcc  -c -Wall test.c

In file included from test.c:1:0:
test.c: In function 'test':
macros.h:1:22: warning: 'uninit' is used uninitialized in this function 
[-Wuninitialized]
  #define print_int(x) print_it("%d",(x))
                       ^~~~~~~~
test.c:7:7: note: 'uninit' was declared here
    int uninit;
        ^~~~~~

so the offending line print_int() is not shown.

Regards,

Joris Wu