Re: Silly gcc bugs

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

Den 2016-02-07 kl. 22:36, skrev Mouse:
> > gchecksum.c:1122: warning: integer constant is too large for 'long' type
> > gchecksum.c:1123: warning: integer constant is too large for 'long' type
> > sha512_sum_init is of type Sha512sum, which is guint64, which is
> > supposedly guaranteed to be 64 bits.  However, the compiler doesn't
> > agree.  Changing:
> >     sha512->H[0] = 0x6a09e667f3bcc908;
> > to
> >     sha512->H[0] = 0x6a09e667f3bcc908ULL;
> > makes it work.  gcc bug?
> No.  This has nothing to do with the type of the LHS of the assignment.
> The issue is that the number on the RHS is an integer constant, which
> is defined by C to have type int or long (or perhaps the unsigned
> variants thereof), depending on the size of its value - but the number
> specified is too large for even long, so it's a choice between
> truncating bits away or violating the language spec and giving it a
> type even larger than long.  (Converting it to guint64 for the
> assignment happens later and is not relevant to the warning.)
C99 says (basically) that an integer constant should be put in a type where
it can fit, but at least int.  gcc 4.1.3 is not c99 though, so you must have
a trailing ULL or so as you wrote.

It might work if you add -std=cc99 or -std=gnu99 also.

-- Ragge