[muldvarp]

Which part of the standard is ignored? Again, the standard is _very_ explicit about what undefined behavior means. If you don't like that you can either try to change the standard or use the numerous command line options provided by most compilers to tell your compiler that you would like certain undefined behaviors have a defined meaning.

Saying that compilers shouldn't ignore code with undefined behavior is like saying compilers shouldn't ignore the body of an if-statement just because the condition evaluated to false.

[torstenvl]

You're right on one point: the standard is very explicit.

And because it is explicit—a fact you yourself just admitted—the fact that silent erasure of non-dead code is not a listed option in response to UB means that it is not allowed.

[muldvarp]

The standard is explicit that the behavior of code with undefined behavior is well... undefined and that implementations can do whatever they want.

[torstenvl]

Reasonable people can disagree as to whether that interpretation is valid.

No reasonable person can say that it is explicit. It simply, factually, is not. At no point in any version of the C Standard does the text "implementations can do whatever they want" appear.

I have no time for blatant and insulting dishonesty. We're done here.

[muldvarp]

"3.4.3 undefined behavior

behavior, upon use of a nonportable or erroneous program construct or of erroneous data, for which this International Standard imposes no requirements"

It is _very_ explicit. The following note is (as all notes are) not normative. So even if the note would cast any doubt (it really doesn't), it can safely be ignored.