[PATCH v2 3/3] cache.h: eliminate SHA-1 deprecation warnings on OS X 10.8

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Mac OS X Mountain Lion prints warnings when building git:

	warning: 'SHA1_Init' is deprecated
	(declared at /usr/include/openssl/sha.h:121)

Silence the warnings by using the Common Digest SHA-1
functions for SHA1_Init(), SHA1_Update(), and SHA1_Final().

Add a COMMON_DIGEST_SHA1 knob to the Makefile to allow
choosing this implementation and define it by default on Darwin.

Signed-off-by: David Aguilar <davvid@xxxxxxxxx>
---
Unchanged since last time; rebased to 3/3.

 Makefile | 7 +++++++
 cache.h  | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/Makefile b/Makefile
index 25282b4..8b2f9cc 100644
--- a/Makefile
+++ b/Makefile
@@ -1055,6 +1055,7 @@ ifeq ($(uname_S),Darwin)
 		endif
 	endif
 	COMMON_DIGEST_HMAC = YesPlease
+	COMMON_DIGEST_SHA1 = YesPlease
 	NO_REGEX = YesPlease
 	PTHREAD_LIBS =
 endif
@@ -1390,10 +1391,16 @@ ifdef PPC_SHA1
 	LIB_OBJS += ppc/sha1.o ppc/sha1ppc.o
 	LIB_H += ppc/sha1.h
 else
+ifdef COMMON_DIGEST_SHA1
+	BASIC_CFLAGS += -DCOMMON_DIGEST_FOR_SHA1=1
+	SHA1_HEADER = <CommonCrypto/CommonDigest.h>
+	EXTLIBS += $(LIB_4_CRYPTO)
+else
 	SHA1_HEADER = <openssl/sha.h>
 	EXTLIBS += $(LIB_4_CRYPTO)
 endif
 endif
+endif
 
 ifdef COMMON_DIGEST_HMAC
 	BASIC_CFLAGS += -DCOMMON_DIGEST_FOR_HMAC=1
diff --git a/cache.h b/cache.h
index 94ca1ac..e2b24c6 100644
--- a/cache.h
+++ b/cache.h
@@ -10,11 +10,18 @@
 
 #include SHA1_HEADER
 #ifndef git_SHA_CTX
+#ifdef COMMON_DIGEST_FOR_SHA1
+#define git_SHA_CTX	CC_SHA1_CTX
+#define git_SHA1_Init	CC_SHA1_Init
+#define git_SHA1_Update	CC_SHA1_Update
+#define git_SHA1_Final	CC_SHA1_Final
+#else
 #define git_SHA_CTX	SHA_CTX
 #define git_SHA1_Init	SHA1_Init
 #define git_SHA1_Update	SHA1_Update
 #define git_SHA1_Final	SHA1_Final
 #endif
+#endif
 
 #include <zlib.h>
 typedef struct git_zstream {
-- 
1.8.3.rc1.47.g41936fa

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