Thanks, Glenn, it's the column positions of the warning on line 9.

Flymake expects the warning to come after the note, but on
gcc 4 it comes before. No biggie, I'll just skip it based on the
output of gcc -v.

On Fri, Oct 20, 2017 at 12:55 AM, Glenn Morris <rgm@gnu.org> wrote:

>
> And here's the output with gcc 5.3 on the same system, where the test
> passes:
>
> cc    -c -o errors-and-warnings.o errors-and-warnings.c
> In file included from errors-and-warnings.c:3:0:
> some-problems.h:3:1: warning: data definition has no type or storage class
>  strange;
>  ^
> some-problems.h:3:1: warning: type defaults to 'int' in declaration of
> 'strange' [-Wimplicit-int]
> some-problems.h:5:1: error: unknown type name 'sint'
>  sint main();
>  ^
> errors-and-warnings.c: In function 'main':
> errors-and-warnings.c:9:12: warning: overflow in implicit constant
> conversion [-Woverflow]
>    char c = 1000; /* a note and a warning */
>             ^
> errors-and-warnings.c:11:8: error: redeclaration of 'c' with no linkage
>    char c; if (bla == (void*)3); /* an error, and two warnings */
>         ^
> errors-and-warnings.c:9:8: note: previous definition of 'c' was here
>    char c = 1000; /* a note and a warning */
>         ^
> errors-and-warnings.c:11:19: warning: comparison between pointer and
> integer
>    char c; if (bla == (void*)3); /* an error, and two warnings */
>                    ^
>
>


-- 
João Távora