[PATCH i-g-t] lib/igt_core: Workaround igt_thread failure when libunwind is not present

[Kamil Konieczny]

Hi Jeevaka,
On 2025-05-21 at 18:31:20 +0000, Jeevaka Prabu Badrappan wrote:
> igt_thread test expects the test failure accompanied by a stack trace
> and it matches the trace prefix "Stack trace: " to determine test result.
> 
> With the commit "Add a dummy workaround when libunwind is not present",
> this trace prefix "Stack trace: " is not printed, resulting in an
> igt_thread test failure.
> 
> There are 2 solutions to fix this issue:
> 1. Print the trace "Stack trace: not implemented"
> 2. Run the failure test only if libunwind is present.
> 
> This patch implements the first approach.

Looks good, I tested it with container build-debian-minimal so

Reviewed-by: Kamil Konieczny <kamil.konieczny at linux.intel.com>

Btw I will adjust a little your subject and description and
will merge it soon as this fixes our GitLab CI pipeline.

Regards,
Kamil

> 
> Signed-off-by: Jeevaka Prabu Badrappan <jeevaka.badrappan at intel.com>
> ---
>  lib/igt_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/igt_core.c b/lib/igt_core.c
> index f698494e1..b06cdfd89 100644
> --- a/lib/igt_core.c
> +++ b/lib/igt_core.c
> @@ -378,7 +378,7 @@ static int _igt_dynamic_tests_executed = -1;
>  static void print_backtrace(void)
>  {
>  #ifndef HAVE_LIBUNWIND
> -	igt_info("backtrace not implemented\n");
> +	igt_info("Stack trace: not implemented\n");
>  #else
>  	unw_cursor_t cursor;
>  	unw_context_t uc;
> @@ -2242,7 +2242,7 @@ xprintf(const char *fmt, ...)
>  static void print_backtrace_sig_safe(void)
>  {
>  #ifndef HAVE_LIBUNWIND
> -	igt_info("backtrace not implemented\n");
> +	igt_info("Stack trace: not implemented\n");
>  #else
>  	unw_cursor_t cursor;
>  	unw_context_t uc;
> -- 
> 2.49.0
>