From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 2 Aug 2020 23:24:50 +0000 (-0700)
Subject: Work around ksh93 bug that broke config.status
X-Git-Tag: v2.69c~56
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3ba414b2c4f599de1a3834b7074c3d47ff746341;p=thirdparty%2Fautoconf.git

Work around ksh93 bug that broke config.status

* lib/autoconf/status.m4 (_AC_OUTPUT_HEADER):
Use ‘>&1’, which is a no-op, to work around a bug in ksh93
Version JM 93t+ 2010-03-05 as used in OpenIndiana.
The bug causes ‘printf "foo"’ to mistakenly succeed in
some cases even though the underlying ‘write’ syscall fails.
The ‘>&1’ causes the printf to fail, as it should.
---

diff --git a/lib/autoconf/status.m4 b/lib/autoconf/status.m4
index d2ab8235..dd2cb407 100644
--- a/lib/autoconf/status.m4
+++ b/lib/autoconf/status.m4
@@ -880,7 +880,7 @@ m4_define([_AC_OUTPUT_HEADER],
   #
   if test x"$ac_file" != x-; then
     {
-      AS_ECHO(["/* $configure_input  */"]) \
+      AS_ECHO(["/* $configure_input  */"]) >&1 \
       && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs"
     } >"$ac_tmp/config.h" \
       || AC_MSG_ERROR([could not create $ac_file])
@@ -892,7 +892,7 @@ m4_define([_AC_OUTPUT_HEADER],
 	|| AC_MSG_ERROR([could not create $ac_file])
     fi
   else
-    AS_ECHO(["/* $configure_input  */"]) \
+    AS_ECHO(["/* $configure_input  */"]) >&1 \
       && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs" \
       || AC_MSG_ERROR([could not create -])
   fi