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><A
NAME="policy-gcj-native"
>2.5. Native Java Bytecode (gcj packages)</A
></H1
><P
> Java bytecode compiled into native code is referred to as
gcj-code and packages containing gcj-code as gcj-packages.
</P
><P
> gcj-packages has been added in order to improve
performance of Java libraries and programs. This is
particularly useful on architectures where the JVM
does not have a <ACRONYM
CLASS="acronym"
>JIT</ACRONYM
>. However, this performance comes
at the cost of size, extra compilation time and
creates architecture dependent packages.
</P
><P
> Packages <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must not</I
></SPAN
> ship gcj-code without the permission of
the Java team (<CODE
CLASS="email"
><<A
HREF="mailto:debian-java@lists.debian.org"
>debian-java@lists.debian.org</A
>></CODE
>). Source packages that shipped
gcj-packages as of March 22nd,2010, have been given this
permission through the ratification of this policy.
</P
><P
> A request for permission to add gcj should convince
the Java Team that the performance boost of adding
the gcj-packages out-weights the disadvantages.
</P
><P
> Source packages compiling gcj-packages <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> Build-Depend on
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>gcj-native-helper</I
></SPAN
> (formerly known as <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>default-jdk-builddep</I
></SPAN
>). The gcj-code <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>should</I
></SPAN
>
only be shipped for a selected set of architectures.
</P
><P
> The gcj-code <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> be installed in <TT
CLASS="filename"
>/usr/lib/gcj/</TT
>
and shipped separately from the original jar file. The gcj-package
<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> also install the classmap file generated by aot-compile in
<TT
CLASS="filename"
>/usr/share/gcj/classmap.d/</TT
>.
</P
><P
> The gcj-package <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> call rebuild-gcj-db in the postinst and
postrm script, if rebuild-gcj-db is present.
</P
><P
> The gcj-package <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> depend on the package providing the jar
file, it is a native compilation.
The package containing the jar file <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>must</I
></SPAN
> declare either a
Suggests or a Recommends relationship on the gcj-package.
</P
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