[Scons-users] building Java classes from two directories

[William Blevins]

Notes that SCons expands the directories passed to javac as the list of
files.... so javac A/B becomes javac A/B/**/*.java if I remember my Java
regex correctly...

V/R,
William

On Thu, Feb 4, 2016 at 4:03 PM, William Blevins <wblevins001 at gmail.com>
wrote:

> 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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>> Scons-users at scons.org
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>>
>>
>
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