Builds fail due to use of preview features & removed arguments

[Ty Young]

Hi,


As of the merging of Records into JDK proper, source code compiling 
fails using a standard command line of:


bash configure --disable-warnings-as-errors


which fails with:


/home/ty/Downloads/jdk-master/src/java.compiler/share/classes/javax/lang/model/util/AbstractElementVisitor14.java:30: 
warning: [preview] RecordComponentElement is an API that is part of a 
preview feature
import javax.lang.model.element.RecordComponentElement;
                                ^
/home/ty/Downloads/jdk-master/src/java.compiler/share/classes/javax/lang/model/util/SimpleElementVisitor14.java:30: 
warning: [preview] RecordComponentElement is an API that is part of a 
preview feature
import javax.lang.model.element.RecordComponentElement;
                                ^
error: warnings found and -Werror specified


...which was not the case in 13. I'm assuming this is happening now 
because JDK source code actually utilizes the feature preview where as 
with other preview features before simply existed but weren't used in 
source.


I've been told by a JDK developer from the Project Panama mailing list 
that it *does* compile for them, but I'm not aware of the command line 
arguments that JDK developers use. Is this documented somewhere? Should 
it be failing by default like this?


Additionally, the argument --with-libclang-include-aux seems to have 
been deprecated in 14. This, as was told to me by a Panama JDK 
developer, is needed to specify clang headers for custom source builds. 
What is the correct way to specify those now in 14?