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This function will strip '-isysroot PATH' and '-arch ARCH' from the
compile flags if the user has specified one them in extra_compile_flags.
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build, without a way to remove an architecture. Furthermore GCC will
barf if multiple '-isysroot' arguments are present.
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r c C s" t st| t| t| | S )a Customize Python build configuration variables.
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environment may be very different from the build
environment, i.e. different OS levels, different
built tools, different available CPU architectures.
This customization is performed whenever
distutils.sysconfig.get_config_vars() is first
called. It may be used in environments where no
compilers are present, i.e. when installing pure
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and detection of unavailable archs is deferred
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