Date: Tue, 23 Jan 2001 11:58:06 -0800 (PST) From: John Polstra <jdp@polstra.com> To: arch@freebsd.org Cc: bde@zeta.org.au Subject: Re: Request For Review: libc/libc_r changes to allow -lc_r Message-ID: <200101231958.f0NJw6P24271@vashon.polstra.com> In-Reply-To: <Pine.BSF.4.21.0101221935540.27700-100000@besplex.bde.org> References: <Pine.BSF.4.21.0101221935540.27700-100000@besplex.bde.org>
next in thread | previous in thread | raw e-mail | index | archive | help
In article <Pine.BSF.4.21.0101221935540.27700-100000@besplex.bde.org>,
Bruce Evans <bde@zeta.org.au> wrote:
>
> (1) Underscores are verbose and ugly.
> (2) _foo is usually sufficient. _[a-z] is not entirely in the user
> namespace like you are claimed. From the 1990 ISO standard:
> "All identifiers that begin with an underscore are always
> reserved for use as identifiers with file scope in both the
> ordinary identifier and tag name spaces". In practice, this
> means that the implementation can use names beginning with
> _[a-z] except for macro names and global variables that are
> used in macros. E.g., errno must be defined as (*__error())
> and not as (*_error()), since the latter would break the
> standard-conforming application code:
> #include <errno.h>
> void foo(void) { int _error = errno; }
> A single underscore is sufficient in all other cases. E.g.,
> struct member names are in a nested namespace so they don't
> conflict with variable names at all. They may still need a
> single underscore so that they don't conflict with macro
> names.
> (3) We have some precedence for using _foo.
> (4) NetBSD uses _foo (at least in old versions).
So did SVR4, which (I think) introduced weak symbols.
John
--
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200101231958.f0NJw6P24271>