siteconfig: generate configuration data caches for autoconf

siteinfo: Use configuration caches when available

Generate cached configuration data for autoconf for the package
based on a list of header, types, and functions to eliminate the
need for all subesequent package builds to do the actual tests
via the cross compiler and sysroot.  The cache files are
stored in the sysroot in ${STAGING_DATADIR}/${TARGET_SYS}_config_site.d.
Siteinfo appends any files it finds in that directory to the normal
CONFIG_SITE.  All of the cache values set the variables only if not
already set so they may be overridden by any of the normal site files.

Signed-off-by: Jeff Polk <jeff.polk@windriver.com>

meta/classes/siteconfig.bbclass

@@ -0,0 +1,31 @@
+siteconfig_do_siteconfig() {
+	if [ ! -d ${FILE_DIRNAME}/site_config ]; then
+		exit 0
+	fi
+	mkdir ${WORKDIR}/site_config
+	gen-site-config ${FILE_DIRNAME}/site_config \
+		>${WORKDIR}/site_config/configure.ac
+	cd ${WORKDIR}/site_config
+	autoconf
+        CONFIG_SITE="" ./configure ${CONFIGUREOPTS} --cache-file ${PN}_cache
+	sed -n -e "/ac_cv_c_bigendian/p" -e "/ac_cv_sizeof_/p" \
+		-e "/ac_cv_type_/p" -e "/ac_cv_header_/p" -e "/ac_cv_func_/p" \
+		< ${PN}_cache > ${PN}_config
+	mkdir -p ${SYSROOT_DESTDIR}${STAGING_DATADIR}/${TARGET_SYS}_config_site.d
+	cp ${PN}_config ${SYSROOT_DESTDIR}${STAGING_DATADIR}/${TARGET_SYS}_config_site.d
+}
+
+# Ugly integration with sstate_task_postfunc for now.  The normal package 
+# sysroot components must be installed in order to generate the cache, but
+# the site cache must be generated before the staging archive is generated.
+python sstate_task_postfunc () {
+    shared_state = sstate_state_fromvars(d)
+    sstate_install(shared_state, d)
+    if shared_state['name'] == 'populate-sysroot':
+        bb.build.exec_func('do_siteconfig', d)
+        sstate_clean(shared_state, d)
+        sstate_install(shared_state, d)
+    sstate_package(shared_state, d)
+}
+
+EXPORT_FUNCTIONS do_siteconfig

meta/classes/siteinfo.bbclass

@@ -96,6 +96,13 @@ def siteinfo_get_files(d):
                if os.path.exists(fname):
                        sitefiles += fname + " "
 
+       # Now check for siteconfig cache files
+       path_siteconfig = os.path.join(bb.data.getVar('STAGING_DATADIR', d, 1), bb.data.getVar('TARGET_SYS', d, 1) + "_config_site.d")
+       if os.path.isdir(path_siteconfig):
+               for i in os.listdir(path_siteconfig):
+                       fname = os.path.join(path_siteconfig, i)
+                       sitefiles += fname + " "
+
        bb.debug(1, "SITE files " + sitefiles);
        return sitefiles
 

scripts/gen-site-config

@@ -0,0 +1,53 @@
+#! /bin/sh
+#  Copyright (c) 2005-2008 Wind River Systems, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+cat << EOF
+AC_PREREQ(2.57)
+AC_INIT([site_wide],[1.0.0])
+
+EOF
+
+# Disable as endian is set in the default config
+#echo AC_C_BIGENDIAN
+#echo
+
+if [ -e $1/types ] ; then
+  while read type ; do
+    echo "AC_CHECK_SIZEOF([$type])"
+  done < $1/types
+
+  echo
+fi
+
+if [ -e $1/funcs ]; then
+  while read func ; do
+    echo "AC_CHECK_FUNCS([$func])"
+  done < $1/funcs
+
+  echo
+fi
+
+if [ -e $1/headers ]; then
+  while read header ; do
+    echo "AC_CHECK_HEADERS([$header])"
+  done < $1/headers
+
+  echo
+fi
+
+cat << EOF
+AC_OUTPUT
+EOF