___divti3 and ___umodti3 missing on Darwin

[Geoff Keating]

On 05/08/2006, at 5:19 PM, Jack Howarth wrote:

>     While testing the state of gfortran in gcc trunk at -m64 on  
> MacOS X 10.4
> I discovered a huge number of test failures (848 compared to 26  
> with -m32).
> Almost all of these failures appear to be due to two undefined  
> symbols in
> libgfortran's shared library in the ppc64 version...
>
> http://gcc.gnu.org/ml/fortran/2006-08/msg00112.html
>
> The symbols, ___divti3 and ___umodti3,  are not present in darwin- 
> libgcc.10.4.ver
> or darwin-libgcc.10.5.ver found in gcc/config/rs6000 but they are  
> present
> in the libgcc-std.ver in the gcc directory. I haven't found  
> anything in
> bugzilla about this issue, however it really should be addressed  
> before
> gcc 4.2 is released.

I believe this is a problem in libgcc.a and/or optabs.c, it should  
support __divti3.  Apparently TImode is supposed to be supported by  
generic code, I see this comment in targhooks.c:

    By default we guess this means that any C type is supported.  If
    we can't map the mode back to a type that would be available in C,
    then reject it.  Special case, here, is the double-word arithmetic
    supported by optabs.c.  */

Here 'double-word' means 128-bits, TImode, since a word is 64 bits on  
ppc64.
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