> diff --git a/gcc/gcc.c b/gcc/gcc.c
> index a4323eb146e..e43f46246ad 100644
> --- a/gcc/gcc.c
> +++ b/gcc/gcc.c
> @@ -8268,6 +8268,44 @@ driver::maybe_run_linker (const char *argv0) const
> {
> int tmp = execution_count;
>
> + /* Detect jobserver and drop it if it's not working. */
> + const char *makeflags = env.get ("MAKEFLAGS");
> + if (makeflags != NULL)
> + {
> + const char *needle = "--jobserver-auth=";
> + const char *n = strstr (makeflags, needle);
> + if (n != NULL)
> + {
> + int rfd = -1;
> + int wfd = -1;
> +
> + bool jobserver
> + = ((sscanf(n, "--jobserver-auth=%d,%d", &rfd, &wfd) == 2)
> + && rfd > 0
> + && wfd > 0
> + && fcntl (rfd, F_GETFD) >= 0
> + && fcntl (wfd, F_GETFD) >= 0);
Yes, I suppose this is the test whether file descriptors are open that
should work in our context.
Honza
> +
> + /* Drop the jobserver if it's not working now. */
> + if (!jobserver)
> + {
> + unsigned offset = n - makeflags;
> + char *dup = xstrdup (makeflags);
> + dup[offset] = '\0';
> +
> + const char *space = strchr (makeflags + offset, ' ');
> + if (space != NULL)
> + strcpy (dup + offset, space);
> + xputenv (concat ("MAKEFLAGS=", dup, NULL));
> +
> + // TODO: remove
> + FILE *f = fopen ("/tmp/111x", "a");
> + fprintf (f, "dropping MAKEFLAGS\n");
> + fclose (f);
> + }
> + }
> + }
> +
> if (! have_c)
> {
> #if HAVE_LTO_PLUGIN > 0
> diff --git a/gcc/lto-wrapper.c b/gcc/lto-wrapper.c
> index 353187c6043..10b74d84af7 100644
> --- a/gcc/lto-wrapper.c
> +++ b/gcc/lto-wrapper.c
> @@ -1430,6 +1430,13 @@ run_gcc (unsigned argc, char *argv[])
> jobserver or number of cores. */
> auto_parallel = 1;
> jobserver = jobserver_active_p ();
> +
> +FILE *f = fopen ("/tmp/111x", "a");
> +fprintf (f, "%d %s\n", jobserver, getenv ("MAKEFLAGS"));
> +fclose (f);
> +char buf[1024];
> +sprintf (buf, "ls -l /proc/%d/fd >> /tmp/111x", getpid ());
> +system (buf);
> }
>
> if (linker_output)
