From ad0556cbf7c1b0dfc3180a010f2a14d9597c3222 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Tue, 6 Nov 2007 12:39:47 +0100
Subject: [PATCH] r25874: force specific versions for LEX and YACC.

We often have problems with old yacc and bison versions
and it seem the combination of LAX and YACC also matters.

So we now list all supported version combinations explicit.
flex-2.5.33:bison-2.3 only for now.

metze
---
 source/heimdal_build/config.m4 | 48 ++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/source/heimdal_build/config.m4 b/source/heimdal_build/config.m4
index d53c8599e82..18ecbb75cdb 100644
--- a/source/heimdal_build/config.m4
+++ b/source/heimdal_build/config.m4
@@ -180,8 +180,56 @@ SMB_ENABLE(KERBEROS_LIB, NO)
 SMB_ENABLE(asn1_compile, NO)
 SMB_ENABLE(compile_et, NO)
 
+#
+# We need bison -y and flex in new versions
+# Otherwise we get random runtime failures
+#
+LEX_YACC_COMBINATIONS=""
+LEX_YACC_COMBINATIONS="$LEX_YACC_COMBINATIONS flex-2.5.33:bison-2.3"
+
 AC_PROG_LEX
+LEX_BASENAME=`basename "$LEX"`
+if test x"$LEX_BASENAME" = x"flex"; then
+	# "flex 2.5.33"
+	FLEX_VERSION=`$LEX --version | cut -d ' ' -f2`
+	AC_MSG_CHECKING(flex version)
+	AC_MSG_RESULT($FLEX_VERSION)
+	FLEX_MAJOR=`echo $FLEX_VERSION | cut -d '.' -f1`
+	FLEX_MINOR=`echo $FLEX_VERSION | cut -d '.' -f2`
+	FLEX_RELEASE=`echo $FLEX_VERSION | cut -d '.' -f3`
+
+	LEX_VERSION="flex-$FLEX_MAJOR.$FLEX_MINOR.$FLEX_RELEASE"
+fi
+
 AC_PROG_YACC
+YACC_BASENAME=`basename "$YACC"`
+if test x"$YACC_BASENAME" = x"bison -y"; then
+	# bison (GNU Bison) 2.3
+	BISON_VERSION=`$YACC --version | head -1 | cut -d ' ' -f4`
+	AC_MSG_CHECKING(bison version)
+	AC_MSG_RESULT($BISON_VERSION)
+	BISON_MAJOR=`echo $BISON_VERSION | cut -d '.' -f1`
+	BISON_MINOR=`echo $BISON_VERSION | cut -d '.' -f2`
+
+	YACC_VERSION="bison-$BISON_MAJOR.$BISON_MINOR"
+fi
+
+AC_MSG_CHECKING(working LEX YACC combination)
+LEX_YACC="no"
+if test x"$LEX_VERSION" != x"" -a x"$YACC_VERSION" != x""; then
+	V="$LEX_VERSION:$YACC_VERSION"
+	for C in $LEX_YACC_COMBINATIONS; do
+		if test x"$V" = x"$C"; then
+			LEX_YACC=$V
+			break;
+		fi
+	done
+fi
+if test x"$LEX_YACC" = x"no"; then
+	LEX=false
+	YACC=false
+fi
+AC_MSG_RESULT($LEX_YACC)
 
 # Portions of heimdal kerberos are unpacked into source/heimdal
 # of the samba source tree.