[tardedmeme]

It means the C standard does not specify what the program does. Other documents may still specify what the program does. And the program definitely still does something, whether specified or not.

[chowells]

> And the program definitely still does something, whether specified or not.

No. It most definitely does not mean this. Go read the series this is part of: https://blog.llvm.org/2011/05/what-every-c-programmer-should...

It is absolutely critical that people programming in C understand what real compilers in the real world do.

[tardedmeme]

Are you saying the programs in the blog post don't do things? I think they do things. The whole blog post is talking about which things they do.