Re: redefined symbols issue

[Anders Magnusson <ragge%ludd.ltu.se@localhost>]

Iain Hibbert skrev 2014-04-20 20:07:
> Hello
>
> I found an issue when compiling NetBSD sources with pcc, which I am not
> sure where the 'fault' lies, as pcc handles this slightly differently than
> gcc (and clang) though the cause of it seems strange in its own right.
>
> The problem I face is that DBL_DIG, DBL_MAX, DBL_MIN, FLT_DIG, FLT_MAX and
> FLT_MIN are defined in <machine/limits.h> and <sys/float_ieee754.h> both,
> and during a build of (eg) libc/absvdi2.o, I get an error because they are
> defined slightly differently. For example, in <i386/limits.h> I see:
>
> #define DBL_DIG         15
>
> whereas in <sys/float_ieee754.h> there is effectively:
>
> #define DBL_DIG         __DBL_DIG__
This is actually disallowed in C99 6.10.3 clause 1 and 2.
A redefinition must be literally identical to be allowed.

-- Ragge