Generate vppinfra/config.h from config.in script (same as we do for vlib/config.h)

Change-Id: I55549b589e34a62d3704f788fce801392de22f46
Signed-off-by: Neale Ranns <nranns@cisco.com>

src/configure.ac

@@ -10,6 +10,7 @@ AC_CONFIG_FILES([ \
   vpp-api/java/Makefile \
   vpp-api/vapi/Makefile \
   vlib/config.h \
+  vppinfra/config.h \
 ])
 AC_CONFIG_MACRO_DIR([m4])
 

src/vppinfra.am

@@ -13,17 +13,6 @@
 
 lib_LTLIBRARIES += libvppinfra.la
 
-BUILT_SOURCES += vppinfra/config.h
-
-vppinfra/config.h:
-	@echo "/** Autogenerated by Autotools **/" > $@
-	@echo "#ifndef included_clib_config_h" >> $@
-	@echo "#define included_clib_config_h" >> $@
-	@echo "#ifndef CLIB_LOG2_CACHE_LINE_BYTES " >> $@
-	@echo "#define CLIB_LOG2_CACHE_LINE_BYTES " @LOG2_CACHE_LINE_BYTES@ >> $@
-	@echo "#endif " >> $@
-	@echo "#endif " >> $@
-
 TESTS = 
 
 if ENABLE_TESTS

src/vppinfra/config.h.in

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_clib_config_h
+#define included_clib_config_h
+
+#ifndef CLIB_LOG2_CACHE_LINE_BYTES
+#define CLIB_LOG2_CACHE_LINE_BYTES @LOG2_CACHE_LINE_BYTES@
+#endif
+
+#endif