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bpo-45723: Add helper macros and more caching to configure.ac
Almost all checks are now cached by AC_CACHE_CHECK(). Common patterns are replaced by helper macros. Variable names now use naming scheme ``ac_cv_func_$funcname``, ``ac_cv_lib_$library_$funcname``, or ``ac_cv_header_$headername_h``. ``SYS_SELECT_WITH_SYS_TIME`` is no longer used. ``uuid_create`` and ``uuid_enc_be`` are provided by libc on BSD. It is safe to use ``AC_CHECK_FUNCS`` here. Caching speeds up ./configure -C from ~ 4s to 2.6s on my system. Signed-off-by: Christian Heimes <christian@python.org>
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‎Misc/NEWS.d/next/Build/2021-11-05-15-09-49.bpo-45723.gfSxur.rst

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configure.ac now uses custom helper macros and ``AC_CACHE_CHECK`` to
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simplify and speed up configure runs.

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