Advanced includes/excludes for javac

[Roman Kennke-2]

Hi there,

I have a problem with the javac task that I cannot solve, maybe somebody
can help me. Let's say I have a directory layout like this:

src/proj1/Class1.java
src/proj1/Class2.java
src/proj2/Class1.java
src/proj2/Class2.java

Now I want to compile Class1 from proj1 and Class2 from proj2 and
exclude the other two. Also, I need to compile those in one go because
they depend on each other. I didn't find a way to implement this using
the srcdir attribute, or nested src tags. Any ideas?

Cheers, Roman

--
http://kennke.org/blog/

[Scot P. Floess]

Give this a try:

<javac ..>
  <include name="src/proj1/Class1.java src/proj2/Class2.java"/>
</javac>

This is not something I typically do...and don't have time to test it...

The javac task HTML has some more information on this...

On Mon, 23 Jun 2008, Roman Kennke wrote:

> Hi there,
>
> I have a problem with the javac task that I cannot solve, maybe somebody
> can help me. Let's say I have a directory layout like this:
>
> src/proj1/Class1.java
> src/proj1/Class2.java
> src/proj2/Class1.java
> src/proj2/Class2.java
>
> Now I want to compile Class1 from proj1 and Class2 from proj2 and
> exclude the other two. Also, I need to compile those in one go because
> they depend on each other. I didn't find a way to implement this using
> the srcdir attribute, or nested src tags. Any ideas?
>
> Cheers, Roman
>
> --
> http://kennke.org/blog/
>

Scot P. Floess
27 Lake Royale
Louisburg, NC  27549

252-478-8087 (Home)
919-754-4592 (Work)

Chief Architect JPlate   http://sourceforge.net/projects/jplate
Chief Architect JavaPIM  http://sourceforge.net/projects/javapim

Architect Keros          http://sourceforge.net/projects/keros

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@...
For additional commands, e-mail: user-help@...

[Roman Kennke-2]

Hi Scot,

> Give this a try:
>
> <javac ..>
>   <include name="src/proj1/Class1.java src/proj2/Class2.java"/>
> </javac>

I don't think this works because the include/exclude is always relative
to the src dirs. I think I could trick it by setting the source dir to
some common top-level dir of the two subprojects, but then the javac
task could not map the source to class files anymore and I would end up
compiling all the stuff all the time (something I'd like to avoid).

> The javac task HTML has some more information on this...

Yeah, I already read through it and tried a couple of options, but none
of them seemed to work, for example:

    <javac>
      <src>
        <pathelement location="proj1" />
        <exclude name="Class1.java" />
      </src>
      <src>
        <pathelement location="proj2" />
      </src>
    </javac>

doesn't work.

    <javac>
      <src>
        <fileset dir="proj1">
          <include name="Class1.java" />
        </fileset>
        <fileset dir="proj2">
          <include name="Class2.java" />
        </fileset>
      </src>
    </javac>

Doesn't work either. Etc etc. The basic problem is that javac only
accepts one set of includes/excludes per javac task, but I need one set
of includes/excludes per srcdir. I'm hoping that I simply overlooked
something...?

If this is really not possible, I'd think about extending the javac task
for that, OR implement a special task that can do this. Then I'd like to
discuss at which point you think I should add the includes/excludes.

/Roman

--
http://kennke.org/blog/

[Scot P. Floess]

Hmm...

I'm at a loss...

Just curious, why are you doing this or need to do this?

On Mon, 23 Jun 2008, Roman Kennke wrote:

> Hi Scot,
>
>> Give this a try:
>>
>> <javac ..>
>>   <include name="src/proj1/Class1.java src/proj2/Class2.java"/>
>> </javac>
>
> I don't think this works because the include/exclude is always relative
> to the src dirs. I think I could trick it by setting the source dir to
> some common top-level dir of the two subprojects, but then the javac
> task could not map the source to class files anymore and I would end up
> compiling all the stuff all the time (something I'd like to avoid).
>
>> The javac task HTML has some more information on this...
>
> Yeah, I already read through it and tried a couple of options, but none
> of them seemed to work, for example:
>
>    <javac>
>      <src>
>        <pathelement location="proj1" />
>        <exclude name="Class1.java" />
>      </src>
>      <src>
>        <pathelement location="proj2" />
>      </src>
>    </javac>
>
> doesn't work.
>
>     <javac>
>      <src>
>        <fileset dir="proj1">
>          <include name="Class1.java" />
>        </fileset>
>        <fileset dir="proj2">
>           <include name="Class2.java" />
>        </fileset>
>       </src>
>    </javac>
>
> Doesn't work either. Etc etc. The basic problem is that javac only
> accepts one set of includes/excludes per javac task, but I need one set
> of includes/excludes per srcdir. I'm hoping that I simply overlooked
> something...?
>
> If this is really not possible, I'd think about extending the javac task
> for that, OR implement a special task that can do this. Then I'd like to
> discuss at which point you think I should add the includes/excludes.
>
> /Roman
>
> --
> http://kennke.org/blog/
>

Scot P. Floess
27 Lake Royale
Louisburg, NC  27549

252-478-8087 (Home)
919-754-4592 (Work)

Chief Architect JPlate   http://sourceforge.net/projects/jplate
Chief Architect JavaPIM  http://sourceforge.net/projects/javapim

Architect Keros          http://sourceforge.net/projects/keros

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@...
For additional commands, e-mail: user-help@...

[Steve Loughran]

Roman Kennke wrote:

> Hi there,
>
> I have a problem with the javac task that I cannot solve, maybe somebody
> can help me. Let's say I have a directory layout like this:
>
> src/proj1/Class1.java
> src/proj1/Class2.java
> src/proj2/Class1.java
> src/proj2/Class2.java
>
> Now I want to compile Class1 from proj1 and Class2 from proj2 and
> exclude the other two. Also, I need to compile those in one go because
> they depend on each other. I didn't find a way to implement this using
> the srcdir attribute, or nested src tags. Any ideas?
>

You are in trouble as javac is going to take over. If it wants
something, it may take it anyway.

If you have to do this -and the only place I've even encountered such a
thing was laptop bioses- the trick is to copy all the files you want to
one location, and none of the files you dont want.

This will build, but leave you with another nightmare, working out which
files are actually included.

I would strongly encourage you not to do this. The laptop bioses almost
made sense, because they had to fit into a small amount of memory, but
even then the copies and the mess of #ifdef blocks meant the usual test
for 'is some code in the build' was to edit the file so that it couldn't
compile, then see if that broke the build.

--
Steve Loughran                  http://www.1060.org/blogxter/publish/5
Author: Ant in Action           http://antbook.org/

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@...
For additional commands, e-mail: user-help@...

[Roman Kennke-2]

Hi there,

> I'm at a loss...
>
> Just curious, why are you doing this or need to do this?

I'm developer of a Java VM project, and we are using most of the class
library from GNU Classpath or OpenJDK, and replace some pieces, like the
java.lang package (the stuff that is closest to the VM basically). We
also wouldn't like to delete .java files from the external class library
path.

Our current solution is to build the list of java classes to be compiled
using a complicated script and passing the result list to javac, but
using ant would be much nicer. (As a side note, the Eclispe IDE is able
to handle such complex includes/excludes too.)

Cheers, Roman

--
http://kennke.org/blog/

[Scot P. Floess]

Ah gotcha...makes sense :)

On Mon, 23 Jun 2008, Roman Kennke wrote:

> Hi there,
>
>> I'm at a loss...
>>
>> Just curious, why are you doing this or need to do this?
>
> I'm developer of a Java VM project, and we are using most of the class
> library from GNU Classpath or OpenJDK, and replace some pieces, like the
> java.lang package (the stuff that is closest to the VM basically). We
> also wouldn't like to delete .java files from the external class library
> path.
>
> Our current solution is to build the list of java classes to be compiled
> using a complicated script and passing the result list to javac, but
> using ant would be much nicer. (As a side note, the Eclispe IDE is able
> to handle such complex includes/excludes too.)
>
> Cheers, Roman
>
> --
> http://kennke.org/blog/
>

Scot P. Floess
27 Lake Royale
Louisburg, NC  27549

252-478-8087 (Home)
919-754-4592 (Work)

Chief Architect JPlate   http://sourceforge.net/projects/jplate
Chief Architect JavaPIM  http://sourceforge.net/projects/javapim

Architect Keros          http://sourceforge.net/projects/keros

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@...
For additional commands, e-mail: user-help@...

[Dominique Devienne-2]

On Mon, Jun 23, 2008 at 5:40 AM, Roman Kennke <roman@...> wrote:

> I have a problem with the javac task that I cannot solve, maybe somebody
> can help me. Let's say I have a directory layout like this:
>
> src/proj1/Class1.java
> src/proj1/Class2.java
> src/proj2/Class1.java
> src/proj2/Class2.java
>
> Now I want to compile Class1 from proj1 and Class2 from proj2 and
> exclude the other two. Also, I need to compile those in one go because
> they depend on each other. I didn't find a way to implement this using
> the srcdir attribute, or nested src tags. Any ideas?

The only way to do this is by resetting srcdir to an empty string.
That's the technique <compilewithwalls> and others (including me) have
used in the past.

That way, Javac will compile *only* the file explicitly given to it,
and never implicitly compile files the explicitly given classes depend
on (which will lead to compile failures if the depend classes aren't
found via the classpath).

AFAIK, <javac> will accept several nested <fileset>s, so that's how
you include source files from several directories (but remember to
scrdir=""). --DD

[Roman Kennke-2]

Hi Dominique,

> > I have a problem with the javac task that I cannot solve, maybe somebody
> > can help me. Let's say I have a directory layout like this:
> >
> > src/proj1/Class1.java
> > src/proj1/Class2.java
> > src/proj2/Class1.java
> > src/proj2/Class2.java
> >
> > Now I want to compile Class1 from proj1 and Class2 from proj2 and
> > exclude the other two. Also, I need to compile those in one go because
> > they depend on each other. I didn't find a way to implement this using
> > the srcdir attribute, or nested src tags. Any ideas?
>
> The only way to do this is by resetting srcdir to an empty string.
> That's the technique <compilewithwalls> and others (including me) have
> used in the past.
>
> That way, Javac will compile *only* the file explicitly given to it,
> and never implicitly compile files the explicitly given classes depend
> on (which will lead to compile failures if the depend classes aren't
> found via the classpath).
>
> AFAIK, <javac> will accept several nested <fileset>s, so that's how
> you include source files from several directories (but remember to
> scrdir=""). --DD

Yeah, I suppose this would work. But it would have the disadvantage that
the javac task could not map the sources to the .class files, and would
recompile everything on each invocation. Correct me if I'm wrong.

However, I think I found a better solution that works for me. Instead of
compiling it in one go, I compile it in 2 steps, and in the 1st step I
set the -sourcepath to the other sources dir, so that javac pulls in the
required sources from the other project. Then in the second step, I set
the classpath to the directory into which the 1st step built its
classes, so that it picks up the correct dependencies again. In both
steps I can set the necessary includes/excludes. For the simplified
example I gave above, this would look like:

    <javac srcdir="proj1" excludes="Class2.java" destdir="classes"
           sourcepath="proj2"/>

    <javac srcdir="proj2" excludes="Class1.java" destdir="classes"
           classpath="classes" />


Of course, having this in one javac task invocation would be much nicer.
*hint*

Cheers, Roman

--
http://kennke.org/blog/

[Dominique Devienne-2]

On Mon, Jun 23, 2008 at 2:25 PM, Roman Kennke <roman@...> wrote:

>> The only way to do this is by resetting srcdir to an empty string.
>> That's the technique <compilewithwalls> and others (including me) have
>> used in the past.
>>
>> That way, Javac will compile *only* the file explicitly given to it,
>> and never implicitly compile files the explicitly given classes depend
>> on (which will lead to compile failures if the depend classes aren't
>> found via the classpath).
>>
>> AFAIK, <javac> will accept several nested <fileset>s, so that's how
>> you include source files from several directories (but remember to
>> scrdir=""). --DD
>
> Yeah, I suppose this would work. But it would have the disadvantage that
> the javac task could not map the sources to the .class files, and would
> recompile everything on each invocation. Correct me if I'm wrong.

I think it may be... (note the "may" here). I don't have time to
double-check, but I believe <javac> checks against the destdir to find
out is a .java is up-to-date, not the srcdir. (And when I say <javac>,
I mean Ant's wrapper around Sun's Javac compiler, since Javac itself
do not do that).

Thinking about it, it has to be that way, because I used this
technique for a large project that was doing incremental compiles.

> However, I think I found a better solution that works for me. Instead of
> compiling it in one go, I compile it in 2 steps, and in the 1st step I
> set the -sourcepath to the other sources dir, so that javac pulls in the
> required sources from the other project. Then in the second step, I set
> the classpath to the directory into which the 1st step built its
> classes, so that it picks up the correct dependencies again. In both
> steps I can set the necessary includes/excludes.

Whatever works for you ;-) --DD

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@...
For additional commands, e-mail: user-help@...