From: brantley@coraid.com (Brantley Coile)
Subject: [TUHS] why the leading under score added to function names?
Date: Mon, 20 Feb 2012 18:34:26 -0600 [thread overview]
Message-ID: <96DE558D-5FE2-4F6F-BC83-18EC727162FA@coraid.com> (raw)
In-Reply-To: <alpine.BSF.2.00.1202211012090.62608@aneurin.horsfall.org>
correct. we could link to assembler code with _entry points and not worry about symbol collisions in the rest of the code.
iPhone email
On Feb 20, 2012, at 6:23 PM, "Dave Horsfall" <dave at horsfall.org> wrote:
> On Mon, 20 Feb 2012, arnold at skeeve.com wrote:
>
> [...]
>
>> I'm pretty sure this dates back to PDP-11 days. I'm wondering "why?".
>> Why did the C compiler prepend an underscore to function names?
>
> Sure was the PDP-11 :-) I vaguely recall that it was to make sure that
> user functions did not conflict with predefined assembler functions, as
> that would be a pain to diagnose (much like having swap overlap root).
>
> -- Dave
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next prev parent reply other threads:[~2012-02-21 0:34 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-20 20:52 arnold
2012-02-20 23:21 ` Dave Horsfall
2012-02-21 0:34 ` Brantley Coile [this message]
2012-02-21 2:50 ` Warner Losh
2012-02-21 3:33 ` John Cowan
2012-02-21 3:41 ` Steve Nickolas
2012-02-21 18:18 ` ron
2012-02-22 19:17 arnold
2012-02-22 21:22 ` Dave Horsfall
2012-02-22 22:47 ` A. P. Garcia
2012-02-23 4:30 ` Greg 'groggy' Lehey
2012-02-25 18:45 ` Random832
2012-02-25 19:24 ` Steve Nickolas
2012-02-25 20:39 ` John Cowan
2012-02-25 22:15 ` Random832
2012-02-26 13:28 ` Ronald Natalie
2012-02-27 1:30 ` random832
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