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    SubjectRe: X32 psABI status update
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    On Thursday, March 17, 2011 01:21:16 H.J. Lu wrote:
    > On Wed, Mar 16, 2011 at 7:57 PM, Mike Frysinger <vapier@gentoo.org> wrote:
    > > ok, took long enough, but that answers most things. your usage of "x32-"
    > > prefixed binaries in the documentation seems to imply a lot more than the
    > > fact you just picked those locally to avoid system collisions. this
    > > isnt a wiki page, otherwise i'd clean things up for you.
    >
    > Any suggestion how to create a wiki page for x32?

    seems like the sites.google.com documentation says it includes wiki support.
    http://sites.google.com/site/projectwikitemplate_en/

    ive never used google sites before, so i dont know how to actually enable it
    on the admin side of things.

    > > in looking at the gcc files, it doesnt seem like there's any defines
    > > setup to declare x32 directly. instead, you'd have to do something
    > > like: #ifdef __x86_64__
    > > # if __SIZEOF_LONG__ == 8
    > > /* x86_64 */
    > > # else
    > > /* x32 */
    > > # endif
    > > #endif
    > >
    > > any plans on adding an __x32__ (or whatever) cpp symbol to keep people
    > > from coming up with their own special/broken crap ? or are there some
    > > already that i'm not seeing ?
    >
    > The idea is in most cases, you only need to check __x86_64__ since x32 and
    > x86-64 are very close. In some cases, x32 is very different from x86_64,
    > like assembly codes on long and pointer, you can check __x86_64__ and
    > __LP64__. In glibc, I used a different approach by using macros REG_RAX,
    > .., MOV_LP, ADD_LP, SUB_LP and CMP_LP in assembly codes.

    arm/mips/ppc sets up explicit ABI defines to clearly differentiate between
    things. while __LP64__ should work here, it seems like a poor substitute.
    how about builtin_define("__X32__") ? or __ABI_X32__ ? doesnt seem like i386
    has a standard in this regard to piggy off of.
    -mike
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