I've been working on updating the Debian packages for the 5.9.10 release and
this has thrown up a couple of issues along the way that I think are worthy of
some wider discussion.
1) Since the default version of java on different architectures is different,
there is a requirement to use the -source and -target arguments for javac in
order ensure a consistent version requirements across all architectures.
Currently there is no way to pass additional command line options to the java
compiler, unlike most other languages. The cmake support for java (which we
don't currently fully use) does have a CMAKE_JAVA_COMPILE_FLAGS option which I
tried to implement (basically added this to the javac command line then set it
with -DCMAKE_JAVA_COMPILE_FLAGS="-source 1.5 -target 1.5". This should (?)
work. I've tried various ways of quoting this arguments and I either end up
with the whole lot being treated as a single argument to javac (which doesn't
work) or it gets treated as a list, with semicolons being inserted between the
options (which also doesn't work). What is the "preferred" way of dealing with
variables like this which are actually multiple options? For now I've hacked
in by patching the custom commands in the CMakeLists.txt files, but a cmake
variable based approach would be cleaner and less intrusive.
2) I've been trying to add multiarch support to the packages so different
versions of the library can be installed on the same machine (e.g. 32 and 64
bit versions). Debian (and Ubuntu) achieve this by have a /usr/lib/{arch}
directory for putting libraries in. This is fine, but only 1 version of
executable binaries can be installed in /usr/bin. The problem arises with the
tk support where the plserver executable is actually called by the libraries
and drivers, but not directly by the user. Thinking about this, I think it is
an ideal candidate for installing in a libexec directory (i.e. somewhere for
executables called by other executables). I would propose putting it in
/usr/lib/plplot5.9.10/bin or similar rather than /usr/bin. On multiarch
systems it would be in /usr/lib/{arch}/plplot5.9.10/bin. This is what I am
doing for the Debian packages. Do people think this would be a sensible change
more widely? If so, I'll commit it to svn. I like to keep the changes for the
Debian packages to a minimum where possible.
Andrew
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