duplicateExpression false positive for equal-valued dimensional constants

[Long Huang]

For example, when distinct distance and speed constants both equal 1.0. Cppcheck flags their intentional division.

Minimal reproduction

Save as equal-constants-minimal.cpp:

constexpr double DISTANCE_M = 1.0;
constexpr double SPEED_MPS = 1.0;
double TravelTimeSeconds() { return DISTANCE_M / SPEED_MPS; }

Run with Cppcheck 2.22.0:

cppcheck --enable=style --std=c++14 --template=gcc equal-constants-minimal.cpp

Expected

No duplicate-expression diagnostic solely because differently named constants have equal magnitudes. Distance divided by speed intentionally calculates time, the operands are not interchangeable physical quantities.

Actual

equal-constants-minimal.cpp:3:48: warning: Same expression on both sides of '/' because 'DISTANCE_M' and 'SPEED_MPS' represent the same value. [duplicateExpression]

[CHR]

Thanks for reporting, ticket is here: https://trac.cppcheck.net/ticket/15157