What could C/C++ “lose” if they defined a standard ABI?

Question

The title says everything. I am talking about C/C++ specifically, because both consider this as \"implementation issue\". I think, defining a standard interface can ease bui

Answer 1

Rather than a generic ABI for all platforms (which would be disastrous as it would only be optimal for only one platform). The standard's committee could say that each platform will conform to a specific ABI.

But: Who defines it (the first compiler through the door?). In which case they get an excessive competitive advantage. Or a committee after 5 years of compilers (which would be another horrible idea).

Also it does not give the compiler leaway to do further research into new optimization strategies, you would be stuck with the tricks available at the point where the standard was defined.