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See epic for more information.

We're asking all maintainers to execute the following programme:

For each pair of types that are comparable:

add a private compare as a back-end for <=> that can be out-of-line (cf. ~~QTBUG-100276~~)
a classification (incl. user docs! (QTBUG-104110)) into exactly one of
- strong
- partial
- weak
add tests for all relational operators (QTBUG-104108)
all traditional relational operators (==, !=, <, >, <=, >=) that work in C++20 (incl. synthesized ones) should also work in C++17.

Explore how much of this we can hide behind macros, and define such macros.

depends on

QTBUG-104108 As a user of QTestLib, I want to use QCOMPARE_op with C++20's spaceship operator <=>

QTBUG-104110 Support easy, yet precise, documenting of relational operators

is required for

QTBUG-104111 Modernize comparisons [Core: Date/Time]

For Gerrit Dashboard: QTBUG-104113
#	Subject	Branch	Project	Status	CR	V
490932,6	[normative] QUIP-0020: C++20 Comparison	master	meta/quips	Status: NEW	+1	0
474834,2	Introduce QStrongOrdering and QWeakOrdering	dev	qt/qtbase	Status: ABANDONED	-2	0
475447,63	Implement compare helper macros	dev	qt/qtbase	Status: MERGED	+2	0
478199,54	Implement helper Qt::compareThreeWay() function for built-in types	dev	qt/qtbase	Status: MERGED	+2	0
507045,11	Overcome MSVC bugs when detecting C++20 comparison	dev	qt/qtbase	Status: ABANDONED	+1	0
507383,40	Teach Qt::compareThreeWay() to support native float16 types	dev	qt/qtbase	Status: MERGED	+2	0
508464,37	Long live qCompareThreeWay()	dev	qt/qtbase	Status: MERGED	+2	0
518702,15	Implement checking of op<=> in the compare test helpers	dev	qt/qtbase	Status: MERGED	+2	0
523348,4	Move the definition of a native float from qfloat16.h to qtypes.h	dev	qt/qtbase	Status: MERGED	+2	0
523513,2	Move the definition of a native float from qfloat16.h to qtypes.h	6.6	qt/qtbase	Status: MERGED	+2	0
523665,3	Move the definition of a native float from qfloat16.h to qtypes.h	tqtc/lts-6.5	qt/tqtc-qtbase	Status: MERGED	+2	0