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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>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2022-11-07 22:23:11 +01:00 committed by Taylor Blau
parent dc1cf3580e
commit fb8d7add06
1 changed files with 5 additions and 0 deletions
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Makefile
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@ -500,6 +500,11 @@ include shared.mak
# Define BLK_SHA1 to make use of optimized C SHA-1 routines bundled
# with git (in the block-sha1/ directory).
#
# Define NO_APPLE_COMMON_CRYPTO on OSX to opt-out of using the
# "APPLE_COMMON_CRYPTO" backend for SHA-1, which is currently the
# default on that OS. On macOS 01.4 (Tiger) or older,
# NO_APPLE_COMMON_CRYPTO is defined by default.
#
# If don't enable any of the *_SHA1 settings in this section, Git will
# default to its built-in sha1collisiondetection library, which is a
# collision-detecting sha1 This is slower, but may detect attempted