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Makefile: document default SHA-1 backend on OSX
Since [1] the default SHA-1 backend on OSX has been APPLE_COMMON_CRYPTO. Per [2] we'll skip using it on anything older than Mac OS X 10.4 "Tiger"[3]. When "DC_SHA1" was made the default in [4] this interaction between it and APPLE_COMMON_CRYPTO seems to have been missed in. Ever since DC_SHA1 was "made the default" we've still used Apple's CommonCrypto instead of sha1collisiondetection on modern versions of Darwin and OSX. 1.61067954ce
(cache.h: eliminate SHA-1 deprecation warnings on Mac OS X, 2013-05-19) 2.9c7a0beee0
(config.mak.uname: set NO_APPLE_COMMON_CRYPTO on older systems, 2014-08-15) 3. We could probably drop "NO_APPLE_COMMON_CRYPTO", as nobody's likely to care about such on old version of OSX anymore. But let's leave that for now. 4.e6b07da278
(Makefile: make DC_SHA1 the default, 2017-03-17) Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Taylor Blau <me@ttaylorr.com>
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@ -500,6 +500,11 @@ include shared.mak
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# Define BLK_SHA1 to make use of optimized C SHA-1 routines bundled
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# with git (in the block-sha1/ directory).
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#
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# Define NO_APPLE_COMMON_CRYPTO on OSX to opt-out of using the
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# "APPLE_COMMON_CRYPTO" backend for SHA-1, which is currently the
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# default on that OS. On macOS 01.4 (Tiger) or older,
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# NO_APPLE_COMMON_CRYPTO is defined by default.
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#
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# If don't enable any of the *_SHA1 settings in this section, Git will
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# default to its built-in sha1collisiondetection library, which is a
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# collision-detecting sha1 This is slower, but may detect attempted
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