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Re: [PATCH 2/2] bswap: add NO_UNALIGNED_LOADS define

From
Eric Sunshine <sunshine@sunshineco.com>
Date
Dec 29, 2015, 06:42 UTC
Message-ID
<CAPig+cQ_u2Y6Z6SO3JQ0XtaoRCPf7r_gnEh-kTj0mn36ahEoHg@mail.gmail.com>
In-Reply-To
<20151229063600.GB30340@sigill.intra.peff.net>
On Tue, Dec 29, 2015 at 1:36 AM, Jeff King <peff@peff.net> wrote:
> The byte-swapping code automatically decides, based on the
> platform, whether it is sensible to cast an do a potentially
s/an/and/ or something?
Show 14 quoted lines
> unaligned ntohl(), or to pick individual bytes out of an
> array.
>
> It can be handy to override this decision, though, when
> turning on compiler flags that will complain about unaligned
> loads (such as -fsanitize=undefined). This patch adds a
> macro check to make this possible.
>
> There's no nice Makefile knob here; this is for prodding at
> Git's internals, and anybody using it can set
> "-DNO_UNALIGNED_LOADS" in the same place they are setting up
> "-fsanitize".
>
> Signed-off-by: Jeff King <peff@peff.net>
Previous: Jeff KingNext: Jeff King
Message 10 of 12 in “compiling with -fsanitize=undefined”
  1. 0/2 compiling with -fsanitize=undefinedJeff King, Dec 29, 2015
  2. 1/2 avoid shifting signed integers 31 bitsJeff King, Dec 29, 2015
  3. Junio C HamanoDec 30, 2015
  4. Jeff KingDec 30, 2015
  5. Duy NguyenDec 31, 2015
  6. Jeff KingDec 31, 2015
  7. Junio C HamanoJan 4, 2016
  8. Jeff KingJan 4, 2016
  9. 2/2 bswap: add NO_UNALIGNED_LOADS defineJeff King, Dec 29, 2015
  10. Eric SunshineDec 29, 2015
  11. Jeff KingDec 29, 2015
  12. Jeff KingDec 29, 2015

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