[PATCH] libstdc++: implement locale support for AIX

[CHIGOT, CLEMENT]

Hi Rainer,

> This alone makes the patch inacceptable in its present form: breaking
> the libstdc++ ABI is a non-starter.  However, I suspect this can be
> avoided somehow.
Thanks for having tried and I agree the patch isn't ready at all. I've just
wanted to see how behave on other systems and it seems that it might
not work as is.
However, is the C++ ABI not standard ? I don't have this test failing on
AIX, AFAIK. Strange.


> +FAIL: 22_locale/classification/isblank.cc execution test
>
> /vol/gcc/src/hg/master/solaris/libstdc++-v3/testsuite/22_locale/classification/isblank.cc:38: void test02(): Assertion 'std::isblank(L' ', std::locale::classic())' failed.
>
> It turns out that this is caused by ieee_1003.1-2008/ctype_members.cc
> using __bitmapsize = 11 in a couple of places, unlike the generic
> version which uses 15 to accomodate variations in <ctype.h> character
> classifications.
11 is the correct value on AIX and maybe also in Dragnofly/FreeBSD,
based on the value of Dragonfly model. However, big endian vs little
endian needs to be handled. I haven't fix that part on the current
patch I guess. (when bitmapsize = 15, there is no difference, endianness
doesn't matter). However, it might be simpler to set bitmapsize = 15
for everyone, instead of having some defines for that. Maybe.

> However, there are many more which I haven't even started to
> investigate.  I suspect there's one (or a few) reasons immediately
> obvious to someone familiar with the code.
Thanks for the list. I'll check if there is some common with AIX. But
wait until I push the new patch to start studying them.
It'll have the correct #ifdef based on configure and I'll try it on Linux.
Thus, it should be far better.


Thanks,
Clément