Generate Clang compilation database

[Jon Butler]

Hi all,

I'm writing some basic static analysis tools for Blink and Chromium, and I wondered if anyone could tell me the best way to provide the correct includes and defines to each file being analysed? For context, I'm using libtooling and running the script over a subtree of code. Clang docs seem to suggest that getting cmake to generate a JSON-formatted compilation database is the typical way to go about this, but with Chromium's slightly funky build system, I'm not sure that's an option.

I've seen a project called Build EAR (BEAR), which looks like it intercepts calls to the compiler and stashes the options used for each one, but I know a number of Googlers are using Clang, and I'm sure they've got a better / less hacky way.

Thanks in advance,

Jon

[James Robinson]

You can ask ninja what includes/flags/etc it would use for a given target.  That's how chromium.ycm_extra_conf.py works:

https://code.google.com/p/chromium/codesearch#chromium/src/tools/vim/chromium.ycm_extra_conf.py&q=ycm_extr&sq=package:chromium&l=13

There's a big of complexity here in mapping a file to a target (this guesses), but it works pretty well.

- James

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[Scott Graham]

I don't think the ycm script uses this, but there's also ninja -t compdb which might be close to what you want.

[Dirk Pranke]

This. I would be surprised if ninja -t compdb isn't what you want.

[Vivek Galatage]

I was also exploring this option and I got the ninja tool's "-t commands" option handy for this.

You could execute "ninja -C out\Release -t commands <target name>" which just outputs the commands those will be executed. Then we could write the logic to parse the correct includes and the defines from this output. 

Hope this helps! All the best.

[yezhang989]

Hi, Jon Butler.

 

Did you find a way to generate a compilation database for Blink and Chromium?

 

--yezhang

在 2014年2月27日星期四 UTC+8上午7:36:14，Jon Butler写道：

[Daniel Cheng]

https://cs.chromium.org/chromium/src/tools/clang/scripts/generate_compdb.py is a helper script that generates compile DBs for Chromium.

Daniel

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