bz#15007: Fix mismatch of guards for qecvt

[Andreas Jaeger]

On 04/11/2013 11:16 PM, Roland McGrath wrote:
 > [...]
> The original intent of all the __USE_* macros was that they would always be
> used singly.  That's why we have __USE_MISC at all instead of just using
> "#if defined __USE_BSD || defined __USE_SVID" everywhere.  That is, all the
> headers would only ever have simple "#ifdef __USE_FOO" conditionals (never
> nested), specifically so that features.h is the one and only place where
> all the complex interrelationships have to be understood.  The hope was to
> avoid ever dealing with exactly the kind of confusion we are having now.
> But this has now become quite muddled.
>
> It would be a worthy project for someone to go in and clean this all up
> again.  All the interactions probably necessitate some new __USE_* macros
> at finer grain.  But the situation can probably be simplified nowadays
> because I think we could drop _BSD_SOURCE and _SVID_SOURCE entirely from
> the API (they've gone the way of K&R C).  For all modern source code, it
> seems reasonable enough to support just the various standard-specified
> feature macros plus _GNU_SOURCE.  (By implication we'd drop __FAVOR_BSD and
> the things it enables.  For struct tcphdr/udphdr we could perhaps use some
> anonymous unions to support both the original (BSD) and the Linuxoid field
> names.)

I'm adding this to the wiki at:
http://sourceware.org/glibc/wiki/Development_Todo/Master#Cleanup

thanks for the explanation,
Andreas
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