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Question: Is there any harm in removing this block from pyconfig.h?
#ifndef PY_LONG_LONG
#	define PY_LONG_LONG __int64
#	define PY_LLONG_MAX _I64_MAX
#	define PY_LLONG_MIN _I64_MIN
#	define PY_ULLONG_MAX _UI64_MAX
#endif
pyconfig.h contains this small snippet:
/* 64 bit ints are usually spelt __int64 unless compiler has overridden */
#define HAVE_LONG_LONG 1
#ifndef PY_LONG_LONG
#	define PY_LONG_LONG __int64
#	define PY_LLONG_MAX _I64_MAX
#	define PY_LLONG_MIN _I64_MIN
#	define PY_ULLONG_MAX _UI64_MAX
#endif
However, in pyport.h, I can see that PY_LONG_LONG may also be defined
here, except the tokens are slightly different:
#ifdef HAVE_LONG_LONG
	#ifndef PY_LONG_LONG
		#define PY_LONG_LONG long long
		
		#if defined(LLONG_MAX)
			/* If LLONG_MAX is defined in limits.h, use that. */
			#define PY_LLONG_MIN LLONG_MIN
			#define PY_LLONG_MAX LLONG_MAX
			#define PY_ULLONG_MAX ULLONG_MAX
		#elif defined(__LONG_LONG_MAX__)
			/* Otherwise, if GCC has a builtin define, use that. */
			#define PY_LLONG_MAX __LONG_LONG_MAX__
			#define PY_LLONG_MIN (-PY_LLONG_MAX-1)
			#define PY_ULLONG_MAX (__LONG_LONG_MAX__*2ULL + 1ULL)
		#else
			/* Otherwise, rely on two's complement. */
			#define PY_ULLONG_MAX (~0ULL)
			#define PY_LLONG_MAX ((long long)(PY_ULLONG_MAX>>1))
			#define PY_LLONG_MIN (-PY_LLONG_MAX-1)
		#endif /* LLONG_MAX */
	#endif
#endif /* HAVE_LONG_LONG */

This turns out to refer to PC/pyconfig.h, not the top-level pyconfig.h.
It's not clear to me why you say that block of code is no longer used; can you expand on why that's the case?

I think there is harm in removing this block; it would cause PY_LONG_LONG not to be defined anymore. Closing as invalid.