[Bug c/80036] New: Source line not printed for diagnostic if expanded from a macro

[joriswu at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80036

            Bug ID: 80036
           Summary: Source line not printed for diagnostic if expanded
                    from a macro
           Product: gcc
           Version: 7.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joriswu at gmail dot com
  Target Milestone: ---

If a diagnostic is printed for code that expands from a macro, and the macro is
defined in a header file, the source line is not shown. Only the include stack
is :

macros.h:

extern void print_it(const char *fmt, int i);
#define print_int(x) print_it("%d",(x))


code.c:

#include "macros.h"


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.