Compilation with Intel icc 11.1 fails

[Anthony Green]

On Fri, Dec 23, 2011 at 10:42 AM, David Chin <david.w.h.chin@gmail.com> wrote:
> I discovered this while trying to compile Python-2.7.2 with icc 11.1,
> so I downloaded libffi-3.0.10 separately and tried compiling that. The
> compilation fails with this:
>
>    libtool: compile:  icc -DHAVE_CONFIG_H -I. -I.. -I. -I../include
> -Iinclude -I../src -g -O3 -ansi_alias -Wall -fexceptions -MT
> src/x86/ffi64.lo -MD -MP -MF src/x86/.deps/ffi64.Tpo -c
> ../src/x86/ffi64.c  -fPIC -DPIC -o src/x86/.libs/ffi64.o
>    ../src/x86/ffi64.c(44): error: identifier "__int128_t" is undefined
>        __int128_t sse[MAX_SSE_REGS];
>        ^
>
> I found an old thread from 2009 discussing this:
>    http://sourceware.org/ml/libffi-discuss/2009/msg00051.html
>
> I also found a post at Intel's forum suggesting a workaround:
>    http://software.intel.com/en-us/forums/showthread.php?t=56652
>
>> Engineering team is still working on this feature.  Here is a workaround:
>>
>> do
>>
>> typedef struct { int64_t m[2]; } __int128_t;
>>
>> and then change where the uint64_t is assigned to this to be:
>>
>> sse[x].m[0] = *(uint64_t*) v;
>> sse[x].m[1] = 0;
>>
>> and where the uint32_t is assigned to:
>>
>> sse[x].m[0] = *(uint32_t*) v;
>> sse[x].m[1] = 0;
>
> Are there plans to modify libffi to work around this deficiency in Intel icc?


I'm not aware of any plans, but patches are always welcome.

Thanks,

Anthony Green










>
> Thanks!
> --Dave Chin
> Email: david.w.h.chin AT gmail.com
> http://www.wfu.edu/~chindw/Work