RFR: JDK-6604021: RMIC is defaulting to BOOT jdk version, needs to be rmic.jar

[Erik Joelsson]

On 2013-10-15 17:29, Volker Simonis wrote:
> Hi Erik, Alan,
>
> first of all I think this is a good change because it helps porters to
> build a complete JDK even if the newly build rmic wouldn't run.
>
> On the other hand I'm a little bit concerned if this change still
> allows it to bootstrap with a non-Oracle based bootstrap JDK. I
> remember that we had some problems with IBM J9 as bootstrap JDK
> because they have different default implementations of idlj and rmic
> (see http://hg.openjdk.java.net/ppc-aix-port/jdk7u/raw-file/tip/README-ppc.html#_TOC_ANCHOR_4_)
>
> Fortunately, the IBM J9 also contains the original Oracle idlj and
> rmic versions and with the old build it was possible to use them by
> specifying the two variables:
>
> IDLJ='$(ALT_BOOTDIR)/bin/java -cp $(ALT_BOOTDIR)/lib/tools.jar
> com.sun.tools.corba.se.idl.toJavaPortable.Compile'
> RMIC='$(ALT_BOOTDIR)/bin/java -cp $(ALT_BOOTDIR)/lib/tools.jar
> sun.rmi.rmic.Main'
>
> I'm not sure if this is still possible with the new build system.
>
> By the way, the main problem why the IBM J9 idlj and rmic didn't work
> out of the box were some command line options which were only
> supported by the Oracle implementation. It would therefore be very
> nice if you could completely remove such options from the build.
>
> And you can easily check this by trying the IBM J9 as bootstrap JDK on
> Linux/x86_64.
I tried building with J9, but it broke in Hotspot already so couldn't 
get to the relevant parts of the build. But as David pointed out, this 
should work as we aren't running the rmic or idlj in the bootjdk at all now.

/Erik
> Thank you and best regards,
> Volker
>
>
> On Tue, Oct 15, 2013 at 4:40 PM, Alan Bateman <Alan.Bateman at oracle.com> wrote:
>> On 15/10/2013 15:30, Erik Joelsson wrote:
>>> Currently the RMI stubs in the jdk are built with the newly built rmic
>>> binary at the end of the build. This patch changes that and instead builds a
>>> bootstrap version of the rmic classes, much like bootstrap javac in
>>> langtools, which runs on the bootjdk, but generates classes for the new jdk.
>>> The new solution is more friendly to cross compilation.
>>>
>>> A few notes on the patch:
>>>
>>> * In src/share/classes/sun/tools/tree/Node.java, I had to change a call to
>>> a jdk8 only constructor in java.lang.InternalError.
>>> * The packages included when compiling rmic were just picked by extending
>>> for each missing class until the compilation succeeded. If someone knows of
>>> a crucial package or class that needs to be included, please say so.
>>> * I renamed a parameter to SetupJavaCompilation. I do not consider the
>>> parameter a hack anymore, but a necessary option for this case.
>>> * In RMICompilation, the dependency file is now a real touch file instead
>>> of a virtual one. This was needed for proper dependencies in
>>> GenerateClasses.gmk.
>>> * All of corba is compiled twice since I have no idea which parts would
>>> actually be needed. This doesn't add much build time since it can be run
>>> effectively in parallel with the rest of the corba build.
>>> * I put the compilation of bootstrap rmic in GenerateClasses.gmk directly
>>> instead of Tools.gmk. This was to not add much compile time, since Tools.gmk
>>> is included and therefore parsed a lot.
>>>
>>> Bug: https://bugs.openjdk.java.net/browse/JDK-6604021
>>> Webrev: http://cr.openjdk.java.net/~erikj/6604021/webrev.01/
>>>
>>> /Erik
>> It's great to see a solution coming for this, it was always been troublesome
>> to run the newly built rmic.
>>
>> So what are the implications of this? I assume it means that we need to be
>> careful in sun.rmi.rmic, sun.tools.{asm,java,javac,tree,util} and restrict
>> API usage to what is available in the boot JDK - is that right?
>>
>> -Alan.