From 61e50f10c276009bf9472fdd797bf6be60fc2a83 Mon Sep 17 00:00:00 2001
From: Damien Miller <djm@mindrot.org>
Date: Mon, 8 May 2000 20:49:37 +1000
Subject:  - Configure caching and cleanup patch from Andre Lucas'   
 <andre.lucas@dial.pipex.com>

---
 aclocal.m4 | 40 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 5 deletions(-)

(limited to 'aclocal.m4')

diff --git a/aclocal.m4 b/aclocal.m4
index 65783346..16345e12 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1,15 +1,45 @@
-dnl $Id: aclocal.m4,v 1.1 2000/05/01 23:57:51 damien Exp $
+dnl $Id: aclocal.m4,v 1.2 2000/05/08 10:49:37 damien Exp $
 dnl
 dnl OpenSSH-specific autoconf macros
 dnl
 
-dnl AC_PATH_ENTROPY_PROG(variablename, command):
+
+dnl OSSH_CHECK_HEADER_FOR_FIELD(field, header, symbol)
+dnl Does AC_EGREP_HEADER on 'header' for the string 'field'
+dnl If found, set 'symbol' to be defined. Cache the result.
+dnl TODO: This is not foolproof, better to compile and read from there
+AC_DEFUN(OSSH_CHECK_HEADER_FOR_FIELD, [
+# look for field '$1' in header '$2'
+	dnl This strips characters illegal to m4 from the header filename
+	ossh_safe=`echo "$2" | sed 'y%./+-%__p_%'`
+	dnl
+	ossh_varname="ossh_cv_$ossh_safe""_has_"$1
+	AC_MSG_CHECKING(for $1 field in $2)
+	AC_CACHE_VAL($ossh_varname, [
+		AC_EGREP_HEADER($1, $2, [ dnl
+			eval "$ossh_varname=yes" dnl
+		], [ dnl
+			eval "$ossh_varname=no" dnl
+		]) dnl
+	])
+	ossh_result=`eval "echo "$"$ossh_varname"`
+	if test -n "`echo $ossh_varname`"; then
+		AC_MSG_RESULT($ossh_result)
+		if test "x$ossh_result" = "xyes"; then
+			AC_DEFINE($3)
+		fi
+	else
+		AC_MSG_RESULT(no)
+	fi
+])
+
+dnl OSSH_PATH_ENTROPY_PROG(variablename, command):
 dnl Tidiness function, sets 'undef' if not found, and does the AC_SUBST
-AC_DEFUN(AC_PATH_ENTROPY_PROG, [
-	AC_PATH_PROG([$1], [$2])
+AC_DEFUN(OSSH_PATH_ENTROPY_PROG, [
+	AC_PATH_PROG($1, $2)
 	if test -z "[$]$1" ; then
 		$1="undef"
 	fi
-	AC_SUBST([$1])
+	AC_SUBST($1)
 ])
 
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