Problem with int types persists on nettle 2.4 and gnutls 3.0.19 on Solaris 9 Sparc
nisse at lysator.liu.se
Fri Apr 27 17:24:20 CEST 2012
Simon Josefsson <simon at josefsson.org> writes:
> Yes. Understanding what the differences is, and which one is right,
> seems useful first though. If the problem is in gnulib, we can fix
> that and GnuTLS will have the new variant soon.
Quoting my investigation from an old (off-list) email thread, from
November last year:
And the problem seems to be that inttypes.h doesn't define int_fast8_t
types. And then AX_CREATE_STDINT_H (used by nettle) and gnulib (used by
gnutls) both decide to define them, and they do that in an incompatible
From a quick look at gl/stdint.h.in and on posted error messages, I
think glib uses long for all of int_fast8_t, int_fast16_t and
int_fast32_t, and int64_t for int_fast64_t, while nettle uses int8_t,
int, int32_t and int64_t.
>> Actually, one ought to have a look at the definitions in the stdint.h
>> provided by gcc (and at the definitions in the solaris10 stdint.h), and
>> make sure the definitions of the int_fast* types are equivalent.
>> Otherwise one might end up with subtle ABI differences and errors when
>> linking together code compiled by different compilers.
I did a quick check. The following seems to be the correct sizes:
This is using sizeof on the types defined in stdint.h, trying:
gcc -m32 on solaris 9
gcc -m64 on solaris 9
cc -m32 on solaris 10
cc -m64 on solaris 10
Remarkably enough, they all agree. I also get the same sizes from
nettle-stdint.h, for both 32 bit and 64 bit configurations. So I think
nettle (or really, AX_CREATE_STDINT_H) gets this right.
While if I understand gl correctly, it uses 4,4,4,8 for a 32-bit build
and 8,8,8,8 for a 64-bit build (the size of long is different). This
seems wrong. Sure, these are perfectly ok sizes according to C99, but
they differ from the sparc conventions (and possibly conventions for
other architectures as well).
Niels Möller. PGP-encrypted email is preferred. Keyid C0B98E26.
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