Xavier de Gaye added the comment:
The MULTIARCH triplet:
* is used by the build system in the suffix of the name of the _sysconfigdata
private module, it may have any value (including being empty) when the platform
is non-multiarch - for example cross-compiling for an Android emulator with the
'foo-bar-foobar' MULTIARCH triplet works just fine (without the patch)
* is not used by the interpreter
* the Python user may not use it (sys.implementation_multiarch is private)
* is not used in the standard library, except by the sysconfig modules to get
the name of the _sysconfigdata module (and it may be empty)
* is not needed any more to cross-compile non-multiarch platforms (even
without the patch) since issue 28046, where platform-specific directories have
been removed
On Android the MULTIARCH triplet adds the burden of having to maintain the list
of Android processors and abis in configure.ac through a set of complex
conditionals (see below [1]) whose correctness is uncertain and not verified.
This is useless and removed since it is not needed anymore.
[1] The Android set of conditionals in configure.ac:
#if defined(__ANDROID__)
# if defined(__x86_64__) && defined(__LP64__)
x86_64-linux-android
# elif defined(__i386__)
i686-linux-android
# elif defined(__aarch64__) && defined(__AARCH64EL__)
# if defined(__ILP32__)
aarch64_ilp32-linux-android
# else
aarch64-linux-android
# endif
# elif defined(__ARM_EABI__) && defined(__ARMEL__)
arm-linux-androideabi
# elif defined(__mips_hard_float) && defined(_MIPSEL)
# if _MIPS_SIM == _ABIO32
mipsel-linux-android
# elif _MIPS_SIM == _ABI64
mips64el-linux-android
# else
# error unknown platform triplet
# endif
# else
# error unknown platform triplet
# endif
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