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Note on binary architectures

CPU architecture labels used by Intel and others can be confusing and have changed over time. Here's a summary of the labels and directory names commonly used:

32, ia32, x86

legacy 32-bit x86 generations up to Pentium 4 and Intel Core.

em64t, intel64, Intel-64, x86_64, AMD-64

64-bit generations of the Xeon branded CPUs, and the Core 2 generation, mostly compatible with AMD's Opteron and later.

64, ia64, Itanium

Itanium – limited ia32 support, but none for x86_64; not used on Carbon.