[PATCH v6 1/2] cache.h: eliminate SHA-1 deprecation warnings on Mac OS X

[David Aguilar <davvid@gmail.com>]

Mac OS X 10.8 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 CommonCrytpo SHA-1
functions for SHA1_Init(), SHA1_Update(), and SHA1_Final().

Add a NO_COMMON_DIGEST_FOR_OPENSSL option to the Makefile to allow
users to opt out of using this library.  When defined, Git will
use OpenSSL instead.

COMMON_DIGEST_FOR_OPENSSL is defined to enable the OpenSSL
compatibility macros in CommonDigest.h.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: David Aguilar <davvid@gmail.com>
---
Changes since last time:

Name the Makefile variable after the #define for consistency.

 Makefile | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Makefile b/Makefile
index f698c1a..b0eb949 100644
--- a/Makefile
+++ b/Makefile
@@ -137,6 +137,10 @@ all::
 # specify your own (or DarwinPort's) include directories and
 # library directories by defining CFLAGS and LDFLAGS appropriately.
 #
+# Define NO_COMMON_DIGEST_FOR_OPENSSL if you are building on Darwin/Mac OS X
+# and do not want to use Apple's CommonCrypto library.  This allows you to
+# provide your own OpenSSL library, for example from MacPorts.
+#
 # Define BLK_SHA1 environment variable to make use of the bundled
 # optimized C SHA1 routine.
 #
@@ -1054,6 +1058,9 @@ ifeq ($(uname_S),Darwin)
 			BASIC_LDFLAGS += -L/opt/local/lib
 		endif
 	endif
+	ifndef NO_COMMON_DIGEST_FOR_OPENSSL
+		COMMON_DIGEST_FOR_OPENSSL = YesPlease
+	endif
 	NO_REGEX = YesPlease
 	PTHREAD_LIBS =
 endif
@@ -1389,10 +1396,16 @@ ifdef PPC_SHA1
 	LIB_OBJS += ppc/sha1.o ppc/sha1ppc.o
 	LIB_H += ppc/sha1.h
 else
+ifdef COMMON_DIGEST_FOR_OPENSSL
+	BASIC_CFLAGS += -DCOMMON_DIGEST_FOR_OPENSSL
+	SHA1_HEADER = <CommonCrypto/CommonDigest.h>
+else
 	SHA1_HEADER = <openssl/sha.h>
 	EXTLIBS += $(LIB_4_CRYPTO)
 endif
 endif
+endif
+
 ifdef NO_PERL_MAKEMAKER
 	export NO_PERL_MAKEMAKER
 endif
-- 
1.8.3.rc2.3.g81576a6