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

[Roel Janssen]

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.

The patch looks good to me.  You consciously keep the dependencies for
this package as small as possible, which I agree with.

Kind regards,
Roel Janssen