Added auxiliary methods for saving and restoring configuration state.

diff --git a/acinclude/squid-util.m4 b/acinclude/squid-util.m4
new file mode 100644 (file)
index 0000000..0b34c42
--- /dev/null
+++ b/acinclude/squid-util.m4
@@ -0,0 +1,78 @@
+dnl 
+dnl AUTHOR: Francesco Chemolli
+dnl
+dnl SQUID Web Proxy Cache          http://www.squid-cache.org/
+dnl ----------------------------------------------------------
+dnl Squid is the result of efforts by numerous individuals from
+dnl the Internet community; see the CONTRIBUTORS file for full
+dnl details.   Many organizations have provided support for Squid's
+dnl development; see the SPONSORS file for full details.  Squid is
+dnl Copyrighted (C) 2001 by the Regents of the University of
+dnl California; see the COPYRIGHT file for full details.  Squid
+dnl incorporates software developed and/or copyrighted by other
+dnl sources; see the CREDITS file for full details.
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+
+dnl save main environment variables to variables to the namespace defined by the
+dnl first argument (prefix)
+dnl e.g. SQUID_SAVEFLAGS([foo]) will save CFLAGS to foo_CFLAGS etc.
+dnl Saved variables are:
+dnl CFLAGS, CXXFLAGS, LDFLAGS, LIBS plus any variables specified as
+dnl second argument
+AC_DEFUN([SQUID_STATE_SAVE],[
+$1_CFLAGS="${CFLAGS}"
+$1_CXXFLAGS="${CXXFLAGS}"
+$1_LDFLAGS="${LDFLAGS}"
+$1_LIBS="${LIBS}"
+$1_squid_saved_vars="$2"
+for squid_util_var_tosave in $2
+do
+    squid_util_var_tosave2="$1_${squid_util_var_tosave}"
+    eval "${squid_util_var_tosave2}=\"${squid_util_var_tosave}\""
+done
+])
+
+dnl commit the state changes: deleting the temporary state defined in SQUID_STATE_SAVE
+dnl with the same prefix. It's not necessary to specify the extra variables passed
+dnl to SQUID_STATE_SAVE again, they will be automatically reclaimed.
+AC_DEFUN([SQUID_STATE_COMMIT],[
+unset $1_CFLAGS
+unset $1_$CXXFLAGS
+unset $1_LDFLAGS
+unset $1_LIBS
+for squid_util_var_tosave in $$1_squid_saved_vars
+do
+    unset ${squid_util_var_tosave2}
+done
+])
+
+dnl rollback state to the call of SQUID_STATE_SAVE with the same namespace argument.
+dnl all temporary state will be cleared, including the custom variables specified
+dnl at call time. It's not necessary to explicitly name them, they will be automatically
+dnl cleared.
+AC_DEFUN([SQUID_STATE_ROLLBACK],[
+CFLAGS="${$1_CFLAGS}"
+CXXFLAGS="${$1_CXXFLAGS}"
+LDFLAGS="${$1_LDFLAGS}"
+LIBS="${$1_LIBS}"
+for squid_util_var_tosave in $$1_squid_saved_vars
+do
+    squid_util_var_tosave2="$1_${squid_util_var_tosave}"
+    eval "${squid_util_var_tosave}=\$${squid_util_var_tosave2}"
+done
+SQUID_STATE_COMMIT($1)
+])
+

diff --git a/configure.in b/configure.in
index 611b883eadb5d99f3c1169715d95538b05aa4b88..8cd52c2a99922908d1173cdc509a99d08975dc7d 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -14,6 +14,7 @@ AC_REVISION($Revision$)dnl
 AC_PREFIX_DEFAULT(/usr/local/squid)
 AM_MAINTAINER_MODE
 
+m4_include([acinclude/squid-util.m4])
 m4_include([acinclude/compiler-flags.m4])
 
 PRESET_CFLAGS="$CFLAGS"