Is there a compiler flag that makes g++ warn on promotion? I am aware of g++ compiler flags for warning on conversion (such as -Wconversion, -Wsign-conversion), which makes sense as conversions are potentially quite dangerous, but I do not know of a similar flag for warning on promotion. I know (think?) that promotion should be harmless in general, but still, there may be some cases where I would like to be warned when unexpected promotions arise. I have been googling for that but with no success so far.
get g++ to warn on promotions
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You can always search in GNU warning options.
-Wdouble-promotion