[PATCH] version-etc: pacify Oracle Studio 12.6

[Paul Eggert]

Without this patch, it complains: "version-etc.h", line 64:
warning: token-less macro argument (E_TOKENLESS_MACRO)" when in
pedantic mode.
* lib/version-etc.h (version_etc): Port to C89 macro rules.
---
 ChangeLog         | 8 ++++++++
 lib/attribute.h   | 2 +-
 lib/version-etc.h | 2 +-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index f57bdaf16..a826969a8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2020-09-28  Paul Eggert  <eggert@cs.ucla.edu>
+
+       version-etc: pacify Oracle Studio 12.6
+       Without this patch, it complains: "version-etc.h", line 64:
+       warning: token-less macro argument (E_TOKENLESS_MACRO)" when in
+       pedantic mode.
+       * lib/version-etc.h (version_etc): Port to C89 macro rules.
+
 2020-09-27  Bruno Haible  <bruno@clisp.org>
 
        Avoid "warning: The macro `AC_DECL_SYS_SIGLIST' is obsolete".
diff --git a/lib/attribute.h b/lib/attribute.h
index d8d6286c0..b97514655 100644
--- a/lib/attribute.h
+++ b/lib/attribute.h
@@ -80,7 +80,7 @@
 /* Attributes for variadic functions.  */
 
 /* The variadic function expects a trailing NULL argument.
-   ATTRIBUTE_SENTINEL () - The last argument is NULL.
+   ATTRIBUTE_SENTINEL () - The last argument is NULL (requires C99).
    ATTRIBUTE_SENTINEL ((N)) - The (N+1)st argument from the end is NULL.  */
 /* Applies to: functions.  */
 #define ATTRIBUTE_SENTINEL(pos) _GL_ATTRIBUTE_SENTINEL (pos)
diff --git a/lib/version-etc.h b/lib/version-etc.h
index 813084c3d..dd1edafd8 100644
--- a/lib/version-etc.h
+++ b/lib/version-etc.h
@@ -61,7 +61,7 @@ extern void version_etc (FILE *stream,
                          const char *command_name, const char *package,
                          const char *version,
                          /* const char *author1, ..., NULL */ ...)
-  _GL_ATTRIBUTE_SENTINEL ();
+  _GL_ATTRIBUTE_SENTINEL ((0));
 
 /* Display the usual "Report bugs to" stanza.  */
 extern void emit_bug_reporting_address (void);
-- 
2.17.1