[antlr-interest] Using Ant with Antlr3

[Evan Driscoll]

I have a problem with ant and Antlr and I don't know what's going on.

I took the SimpleCalc grammar from 
<http://www.antlr.org/wiki/display/ANTLR3/Five+minute+introduction+to+ANTLR+3> 
and put it into a directory with the following build.xml:

<project name="cminus" default="antlr" basedir=".">

<!-- Antlr3 is called here -->
<target name="antlr">
<antlr:ant-antlr3 xmlns:antlr="antlib:org/apache/tools/ant/antlr"
verbose="true"
outputdirectory="."
target="SimpleCalc.g"/>
</target>

</project>

(This is taken from about halfway down 
<http://www.antlr.org/wiki/display/ANTLR3/How+to+use+ant+with+ANTLR3> 
except that I replaced CMinus.g with SimpleCalc.g.)


I'm on a large network and there are machines with different 
environments. On my machine, I have RHEL 5, and everything works 
swimmingly. I run 'ant' and it builds SimpleCalcLexer.java and 
SimpleCalcParser.java, I can compile those, and run those.

However, if I log into a machine with RHEL 6, then it doesn't work:

Buildfile: build.xml

antlr:

BUILD FAILED
/afs/cs.wisc.edu/u/d/r/driscoll/delete/antlr/build.xml:8: Problem: 
failed to create task or type antlib:org/apache/tools/ant/antlr:ant-antlr3
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.
No types or tasks have been defined in this namespace yet

This appears to be an antlib declaration.
Action: Check that the implementing library exists in one of:
         -/usr/share/ant/lib
         -/u/d/r/driscoll/.ant/lib
         -a directory added on the command line with the -lib argument


Total time: 0 seconds



The Antlr3 task is definitely in my ~/.ant/lib:
   ~/delete/antlr : ls ~/.ant/lib
   antlr-3.4-complete.jar  ant-antlr3.jar

and if I remove those it won't work on my own computer. Furthermore, I'm 
running exactly the same code in the same environment in both cases; ~ 
is on a network drive and I just go to the same location.


If I run 'ant -diagnostics | grep -i antlr' I get this on my machine:
   antlr-3.4-complete.jar (2388361 bytes)
   ant-antlr3.jar (20889 bytes)
   antlr : Not Available (the implementation class is not present)
   user.dir : /afs/cs.wisc.edu/u/d/r/driscoll/delete/antlr

and this on the RHEL 6 machine:
   ant-antlr.jar (5926 bytes)
   antlr-3.4-complete.jar (2388361 bytes)
   ant-antlr3.jar (20889 bytes)
   user.dir : /afs/cs.wisc.edu/u/d/r/driscoll/delete/antlr

(there are also a couple hits in java.class.path)


The difference seems to be the presence of ant-antlr.jar -- which I 
guess is for a previous version of Antlr? That is installed in a system 
directory in RHEL 6:
    ~/delete/antlr : locate ant-antlr.jar
   
/usr/lib64/eclipse/plugins/org.apache.ant_1.7.1.v20100518-1145/lib/ant-antlr.jar
   /usr/share/ant/lib/ant-antlr.jar
   /usr/share/java/ant/ant-antlr.jar

while locate does not find it on my RHEL 5 machine. (Disclaimer: locate 
won't find stuff on our network drives.)


I'm not very familiar with Ant, so I'm not sure what's going on. Any 
ideas of how to fix it?

Evan