RFR: Improve missing symbols handling

[Maurizio Cimadamore]

Seems like an useful follow up. Just to make sure I understand, if -l is 
specified, we get same behavior as before. If -l is NOT specified, then 
the behavior would differ (as we now do the check), and therefore we 
need the 'ignore' option explicitly, if we want to suppress logging. Right?

Maurizio





On 03/05/2019 17:43, Henry Jen wrote:
> Hi,
>
> Please review a webrev[1] that add the missing —missing-symbols warn support, and turn on symbol checking against default library by default.
>
> This is kind of a follow up to JDK-8223247, as that simply assume we are using the default libraries within JVM if no -l option is provided. This webrev now will
>
> - Same behavior as before if both -l and -L are provided.
> - Symbol check is turned on always. If there is no -l provided, jextract will check symbols against the default library.
> - Default is to issue warnings without -l, exclude with explicit -l. This is mostly backward compatible as it doesn’t change generated code/classes, but show warnings to inform user about potential missing libraries.
>
> To be 100% compatible with before, use '—missing-symbols ignore’
>
> Thoughts?
>
> Cheers,
> Henry
>
> [1] http://cr.openjdk.java.net/~henryjen/panama/missingSymbols/webrev/