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    SubjectRe: Userspace compiler support of "long long"
    On Wed, 27 Jun 2007 15:57:15 -0700 Randy Dunlap wrote:

    > On Wed, 27 Jun 2007 18:30:52 -0400 Kyle Moffett wrote:
    >
    > > On Jun 27, 2007, at 13:32:40, Adrian Bunk wrote:
    > > > AFAIR the Intel compiler claims to be gcc.
    > > >
    > > > But these are by far not the only C compilers under Linux, and the
    > > > more important points are:
    > > >
    > > > Is there any userspace Linux compiler that does not support "long
    > > > long"?
    > >
    > > Don't know, but I'd guess not.
    > >
    > >
    > > > If yes, is there any other way to tell that something is a 64bit
    > > > int on 32bit architectures?
    > >
    > > Not that I know of. Probably the straight #else conditional is OK.
    > > We should also merge up the types since *EVERY* linux architecture
    > > has these same types:
    > >
    > > typedef signed char __s8;
    > > typedef unsigned char __u8;
    > > typedef signed short __s16;
    > > typedef unsigned short __u16;
    > > typedef signed int __s32;
    > > typedef unsigned int __u32;
    > >
    > > Then all 64-bit archs have:
    > > typedef signed long __s64;
    > > typedef unsigned long __u64;
    > >
    > > While all 32-bit archs have:
    > > typedef signed long long __s64;
    > > typedef unsigned long long __u64;
    > >
    > > The only trick is if you care about building 32-bit compat code using
    > > 64-bit linux kernel headers. In that case we should probably just
    > > make all archs use "long long" for their 64-bit integers, unless
    > > there's some platform I'm not remembering where "long long" is 128-
    > > bits or bigger. The other benefit is that people could then just use
    > > the printf format "%llu" for 64-bit integers instead of having to
    > > conditionalize it all over the place.
    > >
    > > I'm working on a patch now.
    >
    > LDD3 ch. 11 says that long on Sparc64 is 32 bits.
    > Same for "ppc" (don't know which power* arch. they mean by that).

    Hm, I suppose that table only applies to userspace, not kernel...

    ---
    ~Randy
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