So I'm actually talking about what the Go compilers themselves use for libc, not Go programs. From what I can tell it is: http://code.google.com/p/go/source/b

So I'm actually talking about what the Go compilers themselves use for libc, not Go programs. From what I can tell it is: http://code.google.com/p/go/source/browse/include/libc.h http://code.google.com/p/go/source/browse/include/libc.h Which is definitely not ANSI libc. Go programmers won't care about this, because it's an implementation detail, but we're talking about reading source code.