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Re: [jdt-dev] Non-javac compiler support for '--release N'
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Caution: the following illustrates the thorny road to disillusionment :)
Some pointers from previous attempts:
http://mail.openjdk.java.net/pipermail/compiler-dev/2018-December/012786.html
points to
http://mail.openjdk.java.net/pipermail/compiler-dev/2018-March/011736.html
last message in that thread points to
https://bugs.openjdk.java.net/browse/JDK-8199521
which is not moving since its creation 4 years ago.
I believe ecj *must* implement JEP 247, but as you can see from the
links nobody seems to be interested in making this possible (in a safe
way). What's more: Oracle insists in the right to break existing ecj
implementation with each new release of JDK => using older ecj with
newer JDK is at the mercy of Oracle. Of course it's ecj that get's
blamed when things go wrong.
It simply isn't a level playing field.
best,
Stephan
On 21.03.22 17:07, S A wrote:
Hi all,
to summarize my question, how is a non-javac compiler expected to
support the '--release N' option?
E.g. the Eclipse Java compiler utilizes the archive 'lib/ct.sym' that
is available in the JDK distributions. As far as I'm aware, the
structure of this archive has no official specification and there is
no guarantee that the current structure will remain stable. So are
other compilers meant to use this archive, or was it added exclusively
for javac?
You can e.g. see the class comment of the abstraction class that
Eclipse uses:
https://git.eclipse.org/c/jdt/eclipse.jdt.core.git/tree/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/util/CtSym.java
It's a somewhat lengthy attempt to describe the structure of the
archive. Should we (Eclipse/JDT maintainers) request a specification
for this file (that is adhered to)? Or are non-javac compilers meant
to implement '--release N' "on their own"?
I ask as we already had some issues in Eclipse, with the use of ct.sym
(if interested, see e.g.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=562727 and the list of
related tickets). It would be great to know the perspective of OpenJDK
developers on the "external" use of ct.sym.
Sorry if this has been asked before, or if this is not the correct
mailing list for the topic.
Best regards and thanks,
Simeon
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