Re: commit eb32c992 causes trouble on older Debian

[Paul Eggert <eggert@cs.ucla.edu>]

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Thanks for reporting that. I installed the attached into Gnulib to try 
to work around the problem. Please give it a try (I haven't tested it on 
older Debian).

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From 7b152eb2c2fbabce7eb7b1f789ad6feb0966bbd9 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Tue, 27 Apr 2021 11:23:28 -0700
Subject: [PATCH] libc-config: fix include problem on older Debian

https://lists.gnu.org/r/bug-gnulib/2021-04/msg00198.html
* lib/cdefs.h: Use __GNULIB_CDEFS, not __GLIBC__,
to determine whether to include the bits/* files.
* lib/libc-config.h (__WORDSIZE): Remove.
(__GNULIB_CDEFS): New macro.
---
 ChangeLog         |  9 +++++++++
 lib/cdefs.h       |  6 +++---
 lib/libc-config.h | 10 +++-------
 3 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index bc7427cb0..a110509f6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2021-04-27  Paul Eggert  <eggert@cs.ucla.edu>
+
+	libc-config: fix include problem on older Debian
+	https://lists.gnu.org/r/bug-gnulib/2021-04/msg00198.html
+	* lib/cdefs.h: Use __GNULIB_CDEFS, not __GLIBC__,
+	to determine whether to include the bits/* files.
+	* lib/libc-config.h (__WORDSIZE): Remove.
+	(__GNULIB_CDEFS): New macro.
+
 2021-04-26  Paul Eggert  <eggert@cs.ucla.edu>
 
 	gnulib-tool: port better to current Autoconf
diff --git a/lib/cdefs.h b/lib/cdefs.h
index 9618152ab..b883b2566 100644
--- a/lib/cdefs.h
+++ b/lib/cdefs.h
@@ -489,9 +489,9 @@
       [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
 #endif
 
-/* The #ifndef lets Gnulib avoid including these on non-glibc
-   platforms, where the includes typically do not exist.  */
-#ifdef __GLIBC__
+/* Gnulib avoids including these, as they don't work on non-glibc or
+   older glibc platforms.  */
+#ifndef __GNULIB_CDEFS
 # include <bits/wordsize.h>
 # include <bits/long-double.h>
 #endif
diff --git a/lib/libc-config.h b/lib/libc-config.h
index f2c86144b..fabca2fa3 100644
--- a/lib/libc-config.h
+++ b/lib/libc-config.h
@@ -80,13 +80,9 @@
 # ifndef _FEATURES_H
 #  define _FEATURES_H 1
 # endif
-/* Define __WORDSIZE so that <cdefs.h> does not attempt to include
-   nonexistent files.  Make it a syntax error, since Gnulib does not
-   use __WORDSIZE now, and if Gnulib uses it later the syntax error
-   will let us know that __WORDSIZE needs configuring.  */
-# ifndef __WORDSIZE
-#  define __WORDSIZE %%%
-# endif
+/* Define __GNULIB_CDEFS so that <cdefs.h> does not attempt to include
+   nonexistent files.  */
+# define __GNULIB_CDEFS
 /* Undef the macros unconditionally defined by our copy of glibc
    <sys/cdefs.h>, so that they do not clash with any system-defined
    versions.  */
-- 
2.27.0