[Scons-users] building Java classes from two directories

[William Blevins]

Rob,

If I remember correctly Java sources are handled a bit unintuitively. If
you pass in *.java files then I think they are all built together, but if
you pass in directories, all the directories are "assumed" to be
parallelizable; thus, if you pass in two directories, those directories
will appear as separate javac commands.

If your code looks like:

A/B
A/C

source = [ A/B, A/C ] yields javac A/B and javac A/C // I don't personally
like this behavior

source = [ A ] yields javac A

source = [ "all java files" ] yields javac F1 F2 ... FN

V/R,
William

On Thu, Feb 4, 2016 at 1:10 AM, Rob Boehne <robb at datalogics.com> wrote:

> Scons users,
>
> I have a Java builder that compiles classes from a few java files that are
> hand-written and a slew of SWIG generated java files.  The generated files
> depend on the hand-written ones.
> Here is a snippet:
>
>
>     def gen_java_source_list(target, source, env, for_signature):
>         """If given a directory, simply glob all files in the directory,
> otherwise return a list
>         of source files.
>
>         E.g., when JARCHDIR is set, generate something like
>         > jar cf foo.jar -C $JARCHDIR .
>         otherwise
>         > jar cf foo.jar first.class second.class ...
>         """
>         jarchdir = env.subst('$JARCHDIR')
>         if jarchdir:
>             return "-C %s ." % (jarchdir,)
>         else:
>             result = []
>             for src in source:
>                 contents = src.get_contents()
>                 if contents[:16] != "Manifest-Version":
>                     result.append(src)
>             return result
>
>     javaenv.Replace(_JARSOURCES=gen_java_source_list)
>     classes = javaenv.Java('classes', [javaenv.Dir('#$GENDIR/java'),
> javaenv.Dir('$SOURCEPATH.abspath')])
>     jar = javaenv.Jar('${JAVAPACKAGE}.jar', classes,
> JARCHDIR=javaenv.Dir('classes').path)
>
> With a much older version of SCons (0.97) and python 2.5.6, the Java
> builder builds everything in the two directories, but only passes one
> directory in –sourcepath.
>
> javac -encoding UTF-8 -target 1.5 -source 1.5 -d
> build\win-x86-32\Debug\classes -sourcepath gen\pdfl\java
> gen\pdfl\java\Action.java gen\pdfl\java\AddPageFlags.java <SNIP out 100 or
> so java files in gen\pdfl\java />  gen\pdfl\java\WritingMode.java
> gen\pdfl\java\XPSConvertParams.java
> Source\Interface\CJavaStreamFileImpl.java Source\Interface\Callback.java
> Source\Interface\ConstantName.java Source\Interface\Director.java
> Source\Interface\JavaInputNozzle.java
> Source\Interface\JavaOutputNozzle.java
> Source\Interface\PDFAConvertResult.java
> Source\Interface\PDFStreamInputAdapter.java
> Source\Interface\com\datalogics\PDFL\LibraryException.java
>
> This effectively compiles.
> Using the same Scons scripts with scons-2.4.1 & Python 2.7.11 (on Windows
> 7 with VS2013 here) the ‘javac’ command leaves off the second directory
> specified (or rather leaves out the java sources in it) which results in
> java compile errors for a package they define.
>
> Using tempfile c:\users\robb\appdata\local\temp\tmp_0ip_q.lnk for command
> line:
> javac -encoding UTF-8 -target 1.5 -source 1.5 -d
> build\win-x86-32\Debug\classes -sourcepath gen\pdfl\java
> gen\pdfl\java\Action.java gen\pdfl\java\AddPageFlags.java  <SNIP out 100 or
> so java files in gen\pdfl\java /> gen\pdfl\java\WritingMode.java
> gen\pdfl\java\XPSConvertParams.java
> javac @c:\users\robb\appdata\local\temp\tmp_0ip_q.lnk
> gen\pdfl\java\Action.java:10: package com.datalogics.metadata does not
> exist
> import java.util.EnumSet;import com.datalogics.metadata.*;
>                          ^
> gen\pdfl\java\Document.java:10: package com.datalogics.metadata does not
> exist
> import java.util.EnumSet;import com.datalogics.metadata.*;
>                          ^
> gen\pdfl\java\PDFDict.java:10: package com.datalogics.metadata does not
> exist
> import java.util.EnumSet;import com.datalogics.metadata.*;
>                          ^
> gen\pdfl\java\PDFObject.java:10: package com.datalogics.metadata does not
> exist
> import java.util.EnumSet;import com.datalogics.metadata.*;
>                          ^
> <SNIP>
>
> My reading of the documentation suggests this should work, sources can be
> a list of directories as it is here.
> Another interesting fact, if I change the order the two directories are
> specified in, it generates a command that only includes the sources from
> Source/Interface/.
>
> Does anyone have a suggestion for a workaround or a fix?
>
>
>
>
>
>
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>
>
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