Move volatile build-time information into separate compilation unit

GNUmakefile

@@ -242,6 +242,7 @@ all: version config $(TARGET)
 
 version:
 	@echo "$(PNAME) $(VERSION)"
+	@touch version.c
 
 config:
 	@echo "via pkg-config: $(strip $(PKGS) $(TPKGS))"

main.c

@@ -38,6 +38,7 @@
 #include "cachemgr.h"
 #include "sys.h"
 #include "log.h"
+#include "version.h"
 
 #include <stdlib.h>
 #include <stdio.h>
@@ -65,12 +66,12 @@ extern int daemon(int, int);
 static void
 main_version(void)
 {
-	fprintf(stderr, "%s %s (built %s)\n", PNAME, VERSION, BUILD_DATE);
+	fprintf(stderr, "%s %s (built %s)\n", PNAME, version, build_date);
 	fprintf(stderr, "Copyright (c) 2009-2012, "
 	                "Daniel Roethlisberger <daniel@roe.ch>\n");
 	fprintf(stderr, "http://www.roe.ch/SSLsplit\n");
-	if (FEATURES[0]) {
-		fprintf(stderr, "Features: %s\n", FEATURES);
+	if (features[0]) {
+		fprintf(stderr, "Features: %s\n", features);
 	}
 	nat_version();
 	ssl_openssl_version();

version.c

@@ -0,0 +1,39 @@
+/*
+ * SSLsplit - transparent and scalable SSL/TLS interception
+ * Copyright (c) 2009-2012, Daniel Roethlisberger <daniel@roe.ch>
+ * All rights reserved.
+ * http://www.roe.ch/SSLsplit
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "version.h"
+
+/*
+ * Volatile build-time information which can change between make runs.
+ */
+
+const char *version = VERSION;
+const char *build_date = BUILD_DATE;
+const char *features = FEATURES;
+
+/* vim: set noet ft=c: */

version.h

@@ -0,0 +1,38 @@
+/*
+ * SSLsplit - transparent and scalable SSL/TLS interception
+ * Copyright (c) 2009-2012, Daniel Roethlisberger <daniel@roe.ch>
+ * All rights reserved.
+ * http://www.roe.ch/SSLsplit
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VERSION_H
+#define VERSION_H
+
+extern const char *version;
+extern const char *build_date;
+extern const char *features;
+
+#endif /* !VERSION_H */
+
+/* vim: set noet ft=c: */