Every once in a while we encounter projects using some custom file extension for files that we could in principle extract, but since the extractor doesn't know about the extension the files are skipped.
To handle this, the legacy extractor has a `--file-type` option that one can use to specify a file type to use for all files in that particular extraction. So far, `AutoBuild` has nothing of the sort.
This PR proposes to introduce an environment variable `LGTM_INDEX_FILETYPES` to allow a similar customisation. In the fullness of time, this variable would be set through `lgtm.yml` in the usual way, but for now it is undocumented and for internal use only.
Specifically, `LGTM_INDEX_FILETYPES` is a newline-separated list of ".extension:filetype" pairs, specifying that files with the given `.extension` should be extracted as type `filetype`, where
`filetype` is one of `js`, `html`, `json`, `typescript` or `yaml`.
For example, `.jsm:js` causes all `.jsm` files to be extracted as JavaScript.
This can also be used to override default file types: for example, by specifying `.js:typescript` all JavaScript files will be extracted as TypeScript.
The configuration in `DefaultOptions.qll` assumed that a call to any
top-level function named `error` would exit the program. This is not
true.
The assumption was probably about `error(3)`, which is a GNU extension.
It only exits if its first argument it not 0. Furthermore, projects such
as openssh may define their own function named `error` with different
behaviour. Because the GNU `error` function is non-standard, it's
perfectly fine to shadow it with a project-specific definition.
This change removes two FPs from `PointlessComparison.qll` on
https://github.com/openssh/openssh-portable.
In the precense of multiple core libraries, `getAThrownException()` would return
multiple copies of the same exception, say `System.OverflowException`, one for each
core library. With this change we try to identify which core library a given control
flow element was compiled against, and only return the corresponding version.
