On Fri, Jan 24, 2014 at 05:09:29PM +0100, Dodji Seketeli wrote:
> * input.c (read_line_num): Gracefully handle non-file locations or
> empty caches.
>
> diff --git a/gcc/input.c b/gcc/input.c
> index 547c177..b05e1da 100644
> --- a/gcc/input.c
> +++ b/gcc/input.c
> @@ -600,7 +600,8 @@ static bool
> read_line_num (fcache *c, size_t line_num,
> char ** line, ssize_t *line_len)
> {
> - gcc_assert (line_num > 0);
> + if (!c || line_num < 1)
> + return false;
>
> if (line_num <= c->line_num)
> {
Ok.
> --- /dev/null
> +++ b/gcc/testsuite/c-c++-common/cpp/warning-zero-location.c
> @@ -0,0 +1,6 @@
> +/*
> + { dg-options "-D _GNU_SOURCE" }
> + { dg-do compile }
> + */
> +
> +#define _GNU_SOURCE /* { dg-warning "redefined" } */
I doubt this would fail without the patch though, because
fno-diagnostics-show-caret is added by default to flags.
So, I'd say you need also -fdiagnostics-show-caret in dg-options to
reproduce it.
Jakub
