[cfe-dev] running analysis across translation units

[Ella Oikawa via cfe-dev]

Hi Aaron,

According to my investigation, you can enable CTU analysis with
`experimental-enable-naive-ctu-analysis=true` and `ctu-dir` parameters when
executing clang.
And before your analysis, you should create the external definition mapping
file with `clang-extdef-mapping` or `clang-func-mapping` (depending on your
clang's version, see clang/tools/).
With the mapping file, CTU analysis can find the desired FunctionDecls
outside current TU when CTU analysis is enabled.

An example of invoking clang with CTU analysis enabled:
```
$ clang++ -cc1 -analyze -analyzer-checker=YOUR_REQUIRED_CHECKERS -o
OUTPUT_DIRECTORY/
-analyzer-config experimental-enable-naive-ctu-analysis=true
-analyzer-config ctu-dir=PATH_TO_FIND_MAPPING_FILE/ FILE_TO_BE_ANALYZED.cpp
```

The latest version of CTU analysis is now under merging, hope there will be
some official documents someday.

Hope this helps.

Regards,
Ella

AAA C via cfe-dev <cfe-dev at lists.llvm.org> 于2019年5月26日周日 下午2:36写道：

> Hello,
>
> Is there a way to analyze multiple translation units / files using clang?
> I'm trying to implement a simple analysis to match up each function call to
> its potential FunctionDecls, where the decls might be defined in multiple
> files.
>
> Thanks,
> Aaron
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> cfe-dev at lists.llvm.org
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>
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