Hi,
I'm rather surprised that now, in the "sane default world", only __i386
is defined, whereas __i686 is not on x86_64 -m32, I need -march=i686 on
the command line (together with -m32).
I noticed that while analyzing libstdc++/43394, where I was surprised
that some preprocessor lines, legacy code actually, in the library code
for parallel mode do not "notice" that we have now a better default:
#elif defined(__GNUC__) && defined(__i386) && \
(defined(__i686) || defined(__pentium4) || defined(__athlon))
return __sync_fetch_and_add(__ptr, __addend);
... indeed, such lines want __i686 in order to safely enable the builtin
and still find it undefined.
If - as it's probably the case - I'm a bit confused about the meaning of
those __i?86 macros, what people suggest instead? I suspect my
__GCC_HAVE_SYNC_COMPARE_AND_SWAP_* could be put to good use, still I'm
still curious about the exact semantics of the __i?86 macros...
Thanks in advance,
Paolo.
