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four things will affect general binary compatibility:
CPU architecture and vendor
initial options:
i486-pc (any CPU with Intel 80486 microarchitecture)
x86_64-pc (any CPU with AMD64 or Intel 64 architecture)
arm*-* (some SoC with a microprocessor implementing some ARM ISA)
planned future options:
i586-pc (any CPU with Intel P5 microarchitecture)
i686-pc (any CPU with Intel P6 or any successive microarchitecture)
mips*-*
powerpc*-*
kernel
initial options:
linux
different hardware targets will be built with different configs
planned future options:
knetbsd
system libraries
initial options:
eglibc
portable C/C++ library: works with almost any kernel
optimized for speed rather than for space (big and fast)
planned future options:
uclibc*
different configurations of uClibc can be ABI-incompatible
only works with Linux
optimized for space rather than for speed (small and slow)
example architecture string:
x86_64-pc-linux-eglibc
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