[Bug target/124371] New: [16 Regression] Build fails for x86_64-pc-cygwin due to implicit declaration of function 'kill_all_images'

[Evgeny.Karpov at arm dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124371

            Bug ID: 124371
           Summary: [16 Regression] Build fails for x86_64-pc-cygwin due
                    to implicit declaration of function 'kill_all_images'
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Evgeny.Karpov at arm dot com
  Target Milestone: ---

The patch below introduces a regression for x86_64-pc-cygwin target.

https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=df7d47635cc6326c6eb87ed05debf3367018ea3c

libgfortran/caf/shmem/supervisor.c:438:19: error: implicit declaration of
function 'kill_all_images' [-Wimplicit-function-declaration]

Perhaps it might be properly fixed by this change.

--- a/libgfortran/caf/shmem/supervisor.c
+++ b/libgfortran/caf/shmem/supervisor.c
@@ -300,7 +300,7 @@ startWorker (image *im __attribute__ ((unused)),
   return true;
 }

-#ifndef WIN32
+#ifdef HAVE_FORK
 static void
 kill_all_images (supervisor *m)
 {