From: Amos Jeffries <amosjeffries@squid-cache.org>
Date: Sun, 1 Aug 2010 13:34:08 +0000 (-0600)
Subject: Hack: define top_build_prefix for old autotools
X-Git-Tag: SQUID_3_1_6~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fdf4f92a8f49b7e426a50f9db1ece1cf2aeabe71;p=thirdparty%2Fsquid.git

Hack: define top_build_prefix for old autotools

This hack was removed during the libtool 2.2 upgrade.

The issue shows up as bundle builds failing to link libltdl/libltdlc.la
when they should in fact be linking ../libltdl/libltdlc.la in src/Makefile

It is caused by the macros of libtool 2.2 assuming the presence of
top_build_prefix but since autoconf 2.62 that was replaced with
ac_top_build_prefix and is no longer automatically defined in Makefile's.

Some distros also seem to have back-ported the removal of top_build_prefix
into their old autoconf causing macro version tests to fail.
---

diff --git a/configure.in b/configure.in
index 2bf7ab3398..cdc4bcbe37 100644
--- a/configure.in
+++ b/configure.in
@@ -72,6 +72,14 @@ else
 fi
 
 LT_INIT([dlopen])
+if ! test "${ac_top_build_prefix}" = "";
+then
+	# LTDL v3-v7 macros assume the autoconf 2.62 variable top_build_prefix is defined
+	# But from autoconf 2.64 its called ac_top_build_prefix and not automatically added to the Makefile
+	# This fixes Linux LTDLv3-v7, and BSD LTDL v2.2
+	top_build_prefix=${ac_top_build_prefix}
+	AC_SUBST(top_build_prefix)
+fi
 LTDL_INIT
 LT_LIB_DLLOAD