[PATCH] Support for NO_OPENSSL

Support for completely OpenSSL-less builds. FSF considers distributing GPL
binaries with OpenSSL linked in as a legal problem so this is trouble
e.g. for Debian, or some people might not want to install OpenSSL
anyway. If you

	make NO_OPENSSL=1

you get completely OpenSSL-less build, disabling --merge-order and using
Mozilla's SHA1 implementation.

Ported from Cogito.

Signed-off-by: Petr Baudis <pasky@ucw.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -83,7 +83,7 @@ LIB_H=cache.h object.h blob.h tree.h commit.h tag.h delta.h epoch.h csum-file.h
 	pack.h pkt-line.h refs.h
 LIB_OBJS=read-cache.o sha1_file.o usage.o object.o commit.o tree.o blob.o \
 	 tag.o date.o index.o diff-delta.o patch-delta.o entry.o path.o \
-	 epoch.o refs.o csum-file.o pack-check.o pkt-line.o connect.o ident.o
+	 refs.o csum-file.o pack-check.o pkt-line.o connect.o ident.o
 
 LIB_H += rev-cache.h
 LIB_OBJS += rev-cache.o
@@ -105,6 +105,12 @@ LIB_OBJS += server-info.o
 LIBS = $(LIB_FILE)
 LIBS += -lz
 
+ifndef NO_OPENSSL
+	LIB_OBJS += epoch.o
+else
+	CFLAGS += '-DNO_OPENSSL'
+	MOZILLA_SHA1=1
+endif
 ifdef MOZILLA_SHA1
   SHA1_HEADER="mozilla-sha1/sha1.h"
   LIB_OBJS += mozilla-sha1/sha1.o

rev-list.c

@@ -548,9 +548,13 @@ int main(int argc, char **argv)
 			sort_in_topological_order(&list);
 		show_commit_list(list);
 	} else {
+#ifndef NO_OPENSSL
 		if (sort_list_in_merge_order(list, &process_commit)) {
 			die("merge order sort failed\n");
 		}
+#else
+		die("merge order sort unsupported, OpenSSL not linked");
+#endif
 	}
 
 	return 0;