Why warn about #include_next in system headers?

[Neil Booth]

Franz Sirl wrote:-

> while compiling kdelibs-2.1beta2 with gcc-20010204 there are a lot of
> 
> /usr/include/limits.h:124:3: warning: #include_next is a GCC extension
> 
> I find this warning rather useless in systemheaders, in this case glibc 
> _wants_ to use the GCC extension, so why warn?

There are only 2 reasons I can think of:

1) You asked for warnings in system headers
2) For some reason CPP doesn't think the file it appears in is a
system header.

Neil.