# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1315768540 -7200
# Node ID 4adac94541e02ff307ba3b747c0ed43e0d3bca9c
# Parent  550b8b7d6140de4788708d490f560336c3f8280b
strings: Don't assume <strings.h> exists.

* lib/strings.in.h: Include <strings.h> only if HAVE_STRINGS_H is 1.
* m4/strings_h.m4 (gl_HEADER_STRINGS_H_BODY): Set HAVE_STRINGS_H.
* modules/strings (Makefile.am): Substitute HAVE_STRINGS_H.
* doc/posix-headers/strings.texi: Mention the MSVC problem.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2011-09-11  Bruno Haible  <bruno@clisp.org>
+
+	strings: Don't assume <strings.h> exists.
+	* lib/strings.in.h: Include <strings.h> only if HAVE_STRINGS_H is 1.
+	* m4/strings_h.m4 (gl_HEADER_STRINGS_H_BODY): Set HAVE_STRINGS_H.
+	* modules/strings (Makefile.am): Substitute HAVE_STRINGS_H.
+	* doc/posix-headers/strings.texi: Mention the MSVC problem.
+
 2011-09-11  Bruno Haible  <bruno@clisp.org>
 
 	dirent: Don't assume <dirent.h> exists.
diff --git a/doc/posix-headers/strings.texi b/doc/posix-headers/strings.texi
--- a/doc/posix-headers/strings.texi
+++ b/doc/posix-headers/strings.texi
@@ -15,6 +15,9 @@
 Portability problems not fixed by Gnulib:
 @itemize
 @item
+This header file is missing on some platforms:
+MSVC 9.
+@item
 This header file defines symbols, such as @samp{index}, often used for
 variables, making debugging harder.
 @end itemize
diff --git a/lib/strings.in.h b/lib/strings.in.h
--- a/lib/strings.in.h
+++ b/lib/strings.in.h
@@ -30,7 +30,9 @@
 #endif
 
 /* The include_next requires a split double-inclusion guard.  */
-#@INCLUDE_NEXT@ @NEXT_STRINGS_H@
+#if @HAVE_STRINGS_H@
+# @INCLUDE_NEXT@ @NEXT_STRINGS_H@
+#endif
 
 #ifndef _@GUARD_PREFIX@_STRINGS_H
 #define _@GUARD_PREFIX@_STRINGS_H
diff --git a/m4/strings_h.m4 b/m4/strings_h.m4
--- a/m4/strings_h.m4
+++ b/m4/strings_h.m4
@@ -1,5 +1,5 @@
 # Configure a replacement for <strings.h>.
-# serial 5
+# serial 6
 
 # Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
@@ -16,7 +16,14 @@
 AC_DEFUN([gl_HEADER_STRINGS_H_BODY],
 [
   AC_REQUIRE([gl_HEADER_STRINGS_H_DEFAULTS])
+
   gl_CHECK_NEXT_HEADERS([strings.h])
+  if test $ac_cv_header_strings_h = yes; then
+    HAVE_STRINGS_H=1
+  else
+    HAVE_STRINGS_H=0
+  fi
+  AC_SUBST([HAVE_STRINGS_H])
 
   dnl Check for declarations of anything we want to poison if the
   dnl corresponding gnulib module is not in use.
diff --git a/modules/strings b/modules/strings
--- a/modules/strings
+++ b/modules/strings
@@ -24,6 +24,7 @@
 	$(AM_V_GEN)rm -f $@-t $@ && \
 	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
 	  sed -e 's|@''GUARD_PREFIX''@|${gl_include_guard_prefix}|g' \
+	      -e 's|@''HAVE_STRINGS_H''@|$(HAVE_STRINGS_H)|g' \
 	      -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
 	      -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
 	      -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \