dillon at apollo.backplane.com
Sat Aug 30 10:30:23 PDT 2003
This is precisely what I did a few days ago in DragonFly. The warnings
were getting annoying.
<dillon at backplane.com>
:On Sat, Aug 30, 2003 at 12:49:15PM -0400, Garrett Wollman wrote:
:> In article <20030830161813.GA28890 at twisted.net> you write:
:> >Any chance that someone will finally commit the fixes to prevent the
:> >POSIX_C_SOURCE warnings from showing up? I saw a number of posts on this
:> >topic, but it still seems like it's not "officially committed"
:> >/usr/include/sys/cdefs.h:273: warning: `_POSIX_C_SOURCE' is not defined
:> >/usr/include/sys/cdefs.h:279: warning: `_POSIX_C_SOURCE' is not defined
:> The warnings are wrong, so you should probably ask the GCC people
:> about that.
:The warnings are not wrong (see below), but anyway, since -stable uses
:the "ancient" GCC 2.95.4, the GCC people are not likely to
:give a damn in either case. They usually don't care about the older
:>  That is to say, any identifier used in a preprocessor expression
:> (after macro expansion) is defined to have a value of zero, and GCC
:> should not be complaining about this.
:The code is correct, which is why GCC only gives a warning and not an
:error. Code looking like that are usually an indication of a
:programmer error though, so GCC is perfectly right in warning about
:it. This is similar to the compiler warning about unused variables,
:which isn't a bug either but often indicates a programmer mistake.
:To make gcc shut up, you can apply the following patch to cdefs.h
:which makes the warnings go away, without changing the semantics of the
:include file in any way.
:RCS file: /ncvs/src/sys/sys/cdefs.h,v
:retrieving revision 18.104.22.168
:diff -u -r22.214.171.124 cdefs.h
:--- cdefs.h 18 Sep 2002 04:05:13 -0000 126.96.36.199
:+++ cdefs.h 29 Jan 2003 21:23:30 -0000
:@@ -269,6 +269,8 @@
: * Our macros begin with two underscores to avoid namespace screwage.
: /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
: #if _POSIX_C_SOURCE == 1
: #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
:@@ -280,6 +282,8 @@
: #undef _POSIX_C_SOURCE
: #define _POSIX_C_SOURCE 199209
:+#endif /* _POSIX_C_SOURCE */
: /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
: #ifdef _XOPEN_SOURCE
:<Insert your favourite quote here.>
:ertr1013 at student.uu.se
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