Question: How can I figure out, how many files needs to be recompiled *before* I start the build process.

Sometimes I don't remember how many basic header files I changed so a Rebuild All would be better than a simple build. There seams to be no option for this, but IMHO it must be possible (f.e. XCode give me this information).

**Update:**

My problem is not, that Visual Studio doesn't know what to compile. I need to know how much it *will* compile so that I can decide if I can make a quick test with my new code or if I should write more code till I start the "expensive" build process. Or if my boss ask "When can I have the new build?" the best answer is not "It is done when it is done!".

It's really helpful when the IDE can say *"compile 200 of 589 files"* instead of *"compile x,y, ..."*

Answer: 
RRSIG is not a record, it's a hashed digest of a valid DNS Record. You can query a DNSKEY record, set want\_dnssec=True and get a DNSKEY Record, and an "RRSIG of a DNSKEY Record".

More generally, RRSIG is just a signature of a valid record (such as a DS Record).

So when you ask the server 

```
myresolver.query('sources.org', 'RRSIG')

```

It doesn't know what you are asking for. RRSIG in itself has no meaning, you need to specify *RRSIG of what?*
If you try this, what happens?

```
print myresolver.query('sources.org', 'ANY', 'RRSIG')

```