Enable BOLT on aarch64-unknown-linux-gnu - #1191
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Prevent the definition-matching regex from consuming whitespace between compiler arguments. Only definitions containing an explicit assignment should be moved into Makefile.extra. Other definitions should remain in Setup.local.
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Enable BOLT optimization during CPython build on the aarch64-unknown-linux-gnu platform.
To avoid llvm/llvm-project#146541 the
_ctypesextension is built as a shared module, causing the libffi trampoline code to exists in the extension rather than thepythonbinary.An alternative is to disable these static trampolines using
--disable-exec-static-trampwhen building libffi but this requires writable and executable memory segments which comes with security risks.