[PATCH] thread: pacify GCC on Solaris 10

[Paul Eggert]

Problem reported by Kiyoshi KANAZAWA for grep (Bug#43666#29).
* lib/glthread/thread.h (gl_thread_self): Use ‘(pthread_t) 0’
instead of ‘(pthread_t) NULL’, to pacify GCC on Solaris 10
where pthread_t is unsigned int.
---
 ChangeLog             | 8 ++++++++
 lib/glthread/thread.h | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 4ec03efe4..875f3551a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2020-10-05  Paul Eggert  <eggert@cs.ucla.edu>
+
+       thread: pacify GCC on Solaris 10
+       Problem reported by Kiyoshi KANAZAWA for grep (Bug#43666#29).
+       * lib/glthread/thread.h (gl_thread_self): Use ‘(pthread_t) 0’
+       instead of ‘(pthread_t) NULL’, to pacify GCC on Solaris 10
+       where pthread_t is unsigned int.
+
 2020-10-04  Paul Eggert  <eggert@cs.ucla.edu>
 
        c-stack: avoid AS_IF
diff --git a/lib/glthread/thread.h b/lib/glthread/thread.h
index 4077b4518..403de34b2 100644
--- a/lib/glthread/thread.h
+++ b/lib/glthread/thread.h
@@ -232,7 +232,7 @@ extern const gl_thread_t gl_null_thread;
 extern const gl_thread_t gl_null_thread;
 # else
 #  define gl_thread_self() \
-     (pthread_in_use () ? pthread_self () : (pthread_t) NULL)
+     (pthread_in_use () ? pthread_self () : (pthread_t) 0)
 #  define gl_thread_self_pointer() \
      (pthread_in_use () ? (void *) pthread_self () : NULL)
 # endif
-- 
2.25.1