From 2c016c64f533171e1342c1914754b017026c8ad5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tatuya=20JINMEI=20=E7=A5=9E=E6=98=8E=E9=81=94=E5=93=89?=
 <jinmei@isc.org>
Date: Wed, 11 Nov 2009 08:46:47 +0000
Subject: [PATCH] 2757.	[cleanup]	Enable internal symbol table for
 backtrace only for 			systems that are known to work. 
 Currently, BSD 			variants, Linux and Solaris are
 supported. [RT# 20202]

9.7.0rc1
---
 CHANGES      |  4 ++++
 configure.in | 26 +++++++++++++++++++-------
 2 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/CHANGES b/CHANGES
index f4c4583f3e..0fa2895f28 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+2761.	[cleanup]	Enable internal symbol table for backtrace only for
+			systems that are known to work.  Currently, BSD
+			variants, Linux and Solaris are supported. [RT# 20202]
+
 2760.	[cleanup]	Corrected named-compilezone usage summary. [RT #20533]
 
 2759.	[doc]		Add information about .jbk/.jnw files to 
diff --git a/configure.in b/configure.in
index c8b476c9e9..c36f43992d 100644
--- a/configure.in
+++ b/configure.in
@@ -18,7 +18,7 @@ AC_DIVERT_PUSH(1)dnl
 esyscmd([sed "s/^/# /" COPYRIGHT])dnl
 AC_DIVERT_POP()dnl
 
-AC_REVISION($Revision: 1.488 $)
+AC_REVISION($Revision: 1.489 $)
 
 AC_INIT(lib/dns/name.c)
 AC_PREREQ(2.59)
@@ -1367,8 +1367,7 @@ AC_ARG_ENABLE(symtable,
                           [[all|minimal(default)|none]]],
 		want_symtable="$enableval",  want_symtable="minimal")
 case $want_symtable in
-yes|all|minimal)
-	
+yes|all|minimal)     # "yes" is a hidden value equivalent to "minimal"
 	if test "$PERL" = ""
 	then
 		AC_MSG_ERROR([Internal symbol table requires perl but no perl is found.
@@ -1377,10 +1376,23 @@ Install perl or explicitly disable the feature by --disable-symtable.])
 	if test "$use_libtool" = "yes"; then
 		AC_MSG_WARN([Internal symbol table does not work with libtool.  Disabling symbol table.])
 	else
-		MKSYMTBL_PROGRAM="$PERL"
-		if test $want_symtable = all; then
-			ALWAYS_MAKE_SYMTABLE="yes"
-		fi
+		# we generate the internal symbol table only for those systems
+		# known to work to avoid unexpected build failure.  Also, warn
+		# about unsupported systems when the feature is enabled
+		#  manually.
+		case $host_os in
+		freebsd*|netbsd*|openbsd*|linux*|solaris*|darwin*)
+			MKSYMTBL_PROGRAM="$PERL"
+			if test $want_symtable = all; then
+				ALWAYS_MAKE_SYMTABLE="yes"
+			fi
+			;;
+		*)
+			if test $want_symtable = yes -o $want_symtable = all
+			then
+				AC_MSG_WARN([this system is not known to generate internal symbol table safely; disabling it])
+			fi
+		esac
 	fi
 	;;
 *)