While working on OpenBSD/amd64 support for XFree86, I found out that the C preprocessor symbol for AMD64 machines was changed from __x86_64__ to __AMD64__. But looking at what gcc defines on different AMD63 systems (*BSD, Linux), it looks __AMD64__ is never used. Generally __amd64__ is defined.
linux.cf add -D__AMD64__ to StandardCppDefines, so the code actually works there.
Also, in many places where checks are done for 64 bits arches, the test is in the form
#if defined(_LP64) || defined(__alpha__) .... || defined(__AMD64__).
Since on the BSDs gcc defines _LP64, these conditions will be true. But there are a few cases where the _LP64 test is missing.
Any clues on how to fix that correctly (after 4.4) ? Instead of enumerating all the LP64 arches in several different places, it would be better imho to make sure _LP64 is defined and only testing on this.
For other cases (where the dependance is not a general LP64 problem, but AMD64 specific, it would be more logic imho to use __amd64__.
Matthieu
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