[PATCH 2/5] getopt-posix: avoid spurious failure on Solaris

[Eric Blake]

* m4/getopt.m4 (gl_GETOPT_CHECK_HEADERS): Check for getopt_clip as
an indicator that setting optind=1 is sufficient for reset.

Signed-off-by: Eric Blake <address@hidden>
---
 ChangeLog    |    4 ++++
 m4/getopt.m4 |   11 ++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index d796015..7de81f4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-04-13  Eric Blake  <address@hidden>

+       getopt-posix: avoid spurious failure on Solaris
+       * m4/getopt.m4 (gl_GETOPT_CHECK_HEADERS): Check for getopt_clip as
+       an indicator that setting optind=1 is sufficient for reset.
+
        getopt-posix: avoid spurious failure on FreeBSD
        * m4/getopt.m4 (gl_GETOPT_CHECK_HEADERS): Check for optreset even
        in POSIX mode, since the m4 test uses it.
diff --git a/m4/getopt.m4 b/m4/getopt.m4
index 0ee5821..8d3d8b6 100644
--- a/m4/getopt.m4
+++ b/m4/getopt.m4
@@ -1,4 +1,4 @@
-# getopt.m4 serial 25
+# getopt.m4 serial 26
 dnl Copyright (C) 2002-2006, 2008-2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -79,8 +79,13 @@ AC_DEFUN([gl_GETOPT_CHECK_HEADERS],
   dnl Existence of the variable, in and of itself, is not a reason to replace
   dnl getopt, but knowledge of the variable is needed to determine how to
   dnl reset and whether a reset reparses the environment.
+  dnl Solaris supports neither optreset nor optind=0, but keeps no state that
+  dnl needs a reset beyond setting optind=1; detect Solaris by getopt_clip.
   if test -z "$gl_replace_getopt"; then
-    AC_CHECK_DECLS([optreset], [], [],
+    AC_CHECK_DECLS([optreset], [],
+      [AC_CHECK_DECLS([getopt_clip], [], [],
+        [[#include <getopt.h>]])
+      ],
       [[#include <getopt.h>]])
   fi

@@ -99,7 +104,7 @@ AC_DEFUN([gl_GETOPT_CHECK_HEADERS],
 #include <stdlib.h>
 #include <string.h>

-#if !HAVE_DECL_OPTRESET
+#if !HAVE_DECL_OPTRESET && !HAVE_DECL_GETOPT_CLIP
 # define OPTIND_MIN 0
 #else
 # define OPTIND_MIN 1
-- 
1.6.6.1