Re: [PATCH bpf-next] selftests/bpf: Fix const qualifier warning in fexit_bpf2bpf.c

[Menglong Dong <menglong.dong@linux.dev>]

On 2026/3/6 06:21 Varun R Mallya <varunrmallya@gmail.com> write:
> Building selftests with
> clang 23.0.0 (6fae863eba8a72cdd82f37e7111a46a70be525e0) triggers
> the following error:
> 
>   tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c:117:12:
>   error: assigning to 'char *' from 'const char *' discards qualifiers
>   [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
> 
> The variable `tgt_name` is declared as `char *`, but it stores the
> result of strstr(prog_name[i], "/"). Since `prog_name[i]` is a
> `const char *`, the returned pointer should also be treated as
> const-qualified.
> 
> Update `tgt_name` to `const char *` to match the type of the underlying
> string and silence the compiler warning.
> 
> Signed-off-by: Varun R Mallya <varunrmallya@gmail.com>
> ---
>  tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
> index 23d933f1aec6..92c20803ea76 100644
> --- a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
> +++ b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
> @@ -111,7 +111,7 @@ static void test_fexit_bpf2bpf_common(const char *obj_file,
>  		struct bpf_link_info link_info;
>  		struct bpf_program *pos;
>  		const char *pos_sec_name;
> -		char *tgt_name;
> +		const char *tgt_name;

I have been suffering from this build error too. So,

Acked-by: Menglong Dong <menglong.dong@linux.dev>

>  		__s32 btf_id;
>  
>  		tgt_name = strstr(prog_name[i], "/");
> -- 
> 2.53.0
> 
> 
>