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Working under openjdk-11; Currently testing for openjdk-8. Afterwards, openjdk-6, openjdk-7, and whatever additional implementations we wish to support. Even though it emits Java 5 bytecode (version 49.0), the result can be run on openjdk-11, the compiler seems to work fine. This patch reworks ABCL-CONTRIB strategy to introspect the value of the the Java system property "java.class.path". This may not be sufficient to find the contribs under all possible ways that the implementation may be hosted. Currently, JSS does not work. The first stumbling block is enumerating all available loadable classfiles using the new java.lang.module.ModuleView abstraction. JSS certainly does not work but the ABCL-CONTRIB works for implementations with access to a filesystem on which CL:DIRECTORY can work. To provide some background to the issues here, ABCL-CONTRIB is deliberately packaged separately from the contents of `abcl.jar` in order to: 1. Keep the base ANSI implementation plus the included ASDF version in a single artifact with no other dependencies. 2. Push the decision to potentially infringe on licenses explicitly to the user. The knowledgable User may use the build-time option for the inclusion of code in system.lisp and the AIO packaging mechanism to create an unified "All-in-one" artifact. Since ASDF is always included as part of the base `abcl.jar`, we may rely on its presence to find additional artifacts to add as additional code to abcl, aka. "the abcl contribs". Currently, this is achieved by the following strategies, tried sequentially until one is found to be successful: 1. Introspecting for an implementation of "org.abcl-contrib" as declared in the system jar manifest. 2. Attempting to locate a jar file named `abcl-contrib{MUMBLE}.jar`, on the filesystem by searching directories referenced on the class path. 3. Replacing the occurance of 'abcl' with 'abcl-contrib' in the the name of the system jar pathname, and then introspecting the contents. It would probably be helpful to add the following strategies to find members of ABCL-CONTRIB: 4. Locating an `abcl-contrib.asd` artifact via the usual ASDF conventions. 5. Retrieving the contents of ABCL-CONTRIB from the network via a "cool URI". 6. (Java 11) Appropiate use of Java modules to describe graphs of loadable ABCL artifacts.
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