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Re: [Bug-gnulib] Re: include-once-only macros
From: |
Paul Eggert |
Subject: |
Re: [Bug-gnulib] Re: include-once-only macros |
Date: |
Tue, 28 Sep 2004 09:48:29 -0700 |
User-agent: |
Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux) |
Simon Josefsson <address@hidden> writes:
> I thought that POSIX (or C99?) implied user code shouldn't use CPP
> symbols that began with '_'?
C99 reserves all identifiers that begin with an underscore and either
an uppercase letter or another underscore, for any use. (Some other
identifiers are also reserved, in some contexts.)
Hence _FOO_H is not portable C99 code; applications are supposed to
use FOO_H.
gnulib is in a bit of a weird state, since it's sort of an
"application" (subject to the above rules), and sort of a "library"
(thus it shouldn't infringe on the application space more than
necessary, and so it _should_ use names like _FOO_H).
Personally I think of gnulib more as an "application", since it's
intended to be dropped directly into application code. So I prefer
FOO_H to _FOO_H. But I'm not dogmatic about it.
> Does, for example, SVR4/Solaris then define DS_H?
No, Solaris uses e.g., "#ifndef _STDIO_H". But it has to use _[A-Z]
symbols, since it is part of the implementation.
- [Bug-gnulib] Re: licenses again, (continued)
- [Bug-gnulib] Re: licenses again, Paul Eggert, 2004/09/28
- [Bug-gnulib] Re: licenses again, Simon Josefsson, 2004/09/28
- Re: [Bug-gnulib] Re: licenses again, Paul Eggert, 2004/09/28
- Re: [Bug-gnulib] include-once-only macros, Bruno Haible, 2004/09/28
- [Bug-gnulib] Re: include-once-only macros, Simon Josefsson, 2004/09/28
- [Bug-gnulib] Re: include-once-only macros, Bruno Haible, 2004/09/28
- [Bug-gnulib] Re: include-once-only macros, Simon Josefsson, 2004/09/28
- Re: [Bug-gnulib] Re: include-once-only macros,
Paul Eggert <=
- [Bug-gnulib] Re: include-once-only macros, Simon Josefsson, 2004/09/28
- Re: [Bug-gnulib] Re: include-once-only macros, Paul Eggert, 2004/09/28
- Re: [Bug-gnulib] Re: include-once-only macros, Paul Eggert, 2004/09/28
- Re: [Bug-gnulib] Re: licenses again, Bruno Haible, 2004/09/23