Should C linkage (aka "extern (C)") be the default when using "betterC"?

[rempas]

Am I the only one that things this way? If I'm not wrong, other 
than some (mostly runtime) advantages that "betterC" offers, It 
is also necessary when someone wants to allow their library to 
generate binding for other languages.

So I would say that not having to type "extern(C):" in the top of 
every file, would be great. Another things we could have is a 
compiler switch to choose the default linkage we want. Unless 
this is possible and I just not know it...