cache.h: eliminate SHA-1 deprecation warnings on Mac OS X

As of Mac OS X 10.7, Apple deprecated all OpenSSL functions due to
OpenSSL ABI instability, thus leading to build diagnostics such as:

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

Silence the warnings by using Apple's CommonCrypto SHA-1 replacement
functions for SHA1_Init(), SHA1_Update(), and SHA1_Final().

COMMON_DIGEST_FOR_OPENSSL is defined to instruct
<CommonCrypto/CommonDigest.h> to provide compatibility macros
associating OpenSSL SHA-1 functions with their CommonCrypto
counterparts.

[es: reworded commit message]

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Makefile b/Makefile
index cd24c942249a4b175868ffdca27e81392877d29d..5e7cadf0173eb6ea5b02dbabedc527327b975fa4 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1396,11 +1396,17 @@ ifdef PPC_SHA1
        SHA1_HEADER = "ppc/sha1.h"
        LIB_OBJS += ppc/sha1.o ppc/sha1ppc.o
        LIB_H += ppc/sha1.h
+else
+ifdef APPLE_COMMON_CRYPTO
+       COMPAT_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