[cfe-dev] extending C with Clang

[Wei Li]

Dear All:

I am  extending C language for my research work and using Clang for
this. I am adding some annotations which are not part of C language
but will be helpful for my specific work.

 Now consider the following:

int  foo() { return 1; }

is a legal  expression in C and is acceptable by the Clang. Now if I
introduce a new annotation say "Wei"  and write the above expression
as

int foo() Wei { return 1;}

I have to make changes in Clang at the front end to make it work. I
see my extension as super set of C. That is my work should accept the
legal C program as well.

Now here is the problem. When I make changes in the Clang . It accepts
the new annotation but breaks the C programs. My understanding is that
as I am adding to C so if my stuff works, any legal C  program should
also work. But its not happening. I am not a compiler person. I am an
engineer. Any suggestions? why clang is doing this or am I doing
something    which is not compatible with the C grammar.?

-- 
Regards,

Wei Li