[cfe-dev] #ident preprocessor directive is ignored ?

[Douglas Gregor]

On Oct 24, 2012, at 6:47 AM, Xavier Roche <roche+kml2 at exalead.com> wrote:

> Hi folks!
> 
> The #ident preprocessor directive seems to be missing (actually it seems to be /ignored/) - is it a known behavior ?
> 
> Ie. the following program:
> 
> #ident "$$Description: ident-test $$"
> int main(void) { return 0; }
> 
> Produces a binary without the given RCS string:
> 
> $ ident ident-test-clang
> ident-test-clang:
> 
> [ Yes, I admit that the venerable RCS strings are a bit outdated, but there is no other standard way AFAIK to include useful meta-data in libraries, such as version/build information. ]

Clang parses #ident and then throws the results away. It's never been important enough to anyone to actually pass this information through.

	- Doug