bug#26966: [PATCH 07/22] gnu: Add classpath.

[Ricardo Wurmus <rekado@elephly.net>]

Roel Janssen <roel@gnu.org> writes:

> Ricardo Wurmus writes:
>
>> * gnu/packages/java.scm (classpath): New variable.
>> ---
>>  gnu/packages/java.scm | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 58 insertions(+)
>>
>> diff --git a/gnu/packages/java.scm b/gnu/packages/java.scm
>> index 912825a92..e37fd7057 100644
>> --- a/gnu/packages/java.scm
>> +++ b/gnu/packages/java.scm
>> @@ -410,6 +410,64 @@ requirement for all GNU Classpath releases after version 0.93.")
>>  compiler for Java} (ecj) with a command line interface that is compatible with
>>  the standard javac executable.")))
>>
>> +;; Note: All the tool wrappers (e.g. for javah, javac, etc) fail with
>> +;; java.lang.UnsupportedClassVersionError.  They simply won't run on the old
>> +;; sablevm.  We use Classpath 0.99 to build JamVM, on which the Classpath
>> +;; tools do run.  Using these Classpath tools on JamVM we can then build the
>> +;; development version of GNU Classpath.
>> +(define classpath-on-sablevm
>> +  (package
>> +    (name "classpath")
>> +    (version "0.99")
>> +    (source (origin
>> +              (method url-fetch)
>> +              (uri (string-append "mirror://gnu/classpath/classpath-"
>> +                                  version ".tar.gz"))
>> +              (sha256
>> +               (base32
>> +                "1j7cby4k66f1nvckm48xcmh352b1d1b33qk7l6hi7dp9i9zjjagr"))))
>> +    (build-system gnu-build-system)
>> +    (arguments
>> +     `(#:configure-flags
>> +       (list (string-append "--with-ecj-jar="
>> +                            (assoc-ref %build-inputs "ecj-bootstrap")
>> +                            "/share/java/ecj-bootstrap.jar")
>> +             (string-append "JAVAC="
>> +                            (assoc-ref %build-inputs "ecj-javac-wrapper")
>> +                            "/bin/javac")
>> +             (string-append "JAVA="
>> +                            (assoc-ref %build-inputs "sablevm")
>> +                            "/bin/java-sablevm")
>> +             "GCJ_JAVAC_TRUE=no"
>> +             "ac_cv_prog_java_works=yes"  ; trust me
>> +             "--disable-Werror"
>> +             "--disable-gmp"
>> +             "--disable-gtk-peer"
>> +             "--disable-gconf-peer"
>> +             "--disable-plugin"
>> +             "--disable-dssi"
>> +             "--disable-alsa"
>> +             "--disable-gjdoc")
>> +       #:phases
>> +       (modify-phases %standard-phases
>> +         (add-after 'install 'install-data
>> +           (lambda _ (zero? (system* "make" "install-data")))))))
>> +    (native-inputs
>> +     `(("ecj-bootstrap" ,ecj-bootstrap)
>> +       ("ecj-javac-wrapper" ,ecj-javac-wrapper)
>> +       ("fastjar" ,fastjar)
>> +       ("sablevm" ,sablevm)
>> +       ("sablevm-classpath" ,sablevm-classpath)
>> +       ("libltdl" ,libltdl)
>> +       ("pkg-config" ,pkg-config)))
>> +    (home-page "https://www.gnu.org/software/classpath/")
>> +    (synopsis "Essential libraries for Java")
>> +    (description "GNU Classpath is a project to create core class libraries
>> +for use with runtimes, compilers and tools for the Java programming
>> +language.")
>> +    ;; GPLv2 or later, with special linking exception.
>> +    (license license:gpl2+)))
>> +
>>  (define-public java-swt
>>    (package
>>      (name "java-swt")
>
> So, this version is only used for allowing to build the development
> version later, which in turn provides a properly working version for
> reasonably new Java packages?
>
> I'm just trying to understand this properly.

GNU Classpath 0.98 or higher is needed to build JamVM.  0.99 is the
latest release.  We build this to get JamVM, but since 0.99 is very
limited in terms of Java 1.6 support our JamVM package will be rather
limited as well.  We use the jamvm-bootstrap package then to build a
more fully featured GNU Classpath and thus a fully featured JamVM.

--
Ricardo

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