Add support for alternate SHA1 library implementations.

This one includes the Mozilla SHA1 implementation sent in by Edgar Toernig.
It's dual-licenced under MPL-1.1 or GPL, so in the context of git, we
obviously use the GPL version. 

Side note: the Mozilla SHA1 implementation is about twice as fast as the
default openssl one on my G5, but the default openssl one has optimized
x86 assembly language on x86. So choose wisely.

1 files changed, 11 insertions, 11 deletions

diff --git a/Makefile b/Makefile
index 562338ae0c..9573a1189d 100644
--- a/Makefile
+++ b/Makefile
@@ -29,22 +29,22 @@ LIB_H=cache.h object.h
 
 LIBS = $(LIB_FILE)
 LIBS += -lz
-LIBS += -lssl
+
+ifdef MOZILLA_SHA1
+  SHA1_HEADER="mozilla-sha1/sha1.h"
+  LIB_OBJS += mozilla-sha1/sha1.o
+else
+  SHA1_HEADER=<openssl/sha.h>
+  LIBS += -lssl
+endif
+
+CFLAGS += '-DSHA1_HEADER=$(SHA1_HEADER)'
 
 $(LIB_FILE): $(LIB_OBJS)
 	$(AR) rcs $@ $(LIB_OBJS)
 
 init-db: init-db.o
 
-fsck-cache: fsck-cache.o $(LIB_FILE) object.o commit.o tree.o blob.o
-	$(CC) $(CFLAGS) -o fsck-cache fsck-cache.o $(LIBS)
-
-rev-tree: rev-tree.o $(LIB_FILE) object.o commit.o tree.o blob.o
-	$(CC) $(CFLAGS) -o rev-tree rev-tree.o $(LIBS)
-
-merge-base: merge-base.o $(LIB_FILE) object.o commit.o tree.o blob.o
-	$(CC) $(CFLAGS) -o merge-base merge-base.o $(LIBS)
-
 %: %.o $(LIB_FILE)
 	$(CC) $(CFLAGS) -o $@ $< $(LIBS)
 
@@ -77,7 +77,7 @@ unpack-file.o: $(LIB_H)
 write-tree.o: $(LIB_H)
 
 clean:
-	rm -f *.o $(PROG) $(LIB_FILE)
+	rm -f *.o mozilla-sha1/*.o $(PROG) $(LIB_FILE)
 
 backup: clean
 	cd .. ; tar czvf dircache.tar.gz dir-cache