Hello!

As discussed on IRC, I had a semi-victory with the attached patch, which
works around a miscompilation issue in ‘Java_java_io_VMFile_isFile’.

Unfortunately, with this patch applied, ‘ant-bootstrap’ fails to build
with:

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix build -e '(@@ (gnu packages java) ant-bootstrap)' -K
[…]
... Copying Required Files
... Building Ant Distribution
Buildfile: /tmp/guix-build-ant-bootstrap-1.8.4.drv-0/apache-ant-1.8.4/build.xml

BUILD FAILED
Could not load the version information.

Total time: 0 seconds
... Failed Building Ant Distribution !
error: in phase 'build': uncaught exception:
%exception #<&invoke-error program: "bash" arguments: ("bootstrap.sh" "-Ddist.dir=/gnu/store/88qc3rkp3bc6qsf6gmknv51vprd3r8j4-ant-bootstrap-1.8.4") exit-status: 1 term-signal: #f stop-signal: #f> 
phase `build' failed after 0.8 seconds
command "bash" "bootstrap.sh" "-Ddist.dir=/gnu/store/88qc3rkp3bc6qsf6gmknv51vprd3r8j4-ant-bootstrap-1.8.4" failed with status 1
--8<---------------cut here---------------end--------------->8---

The message “Could not load the version information.” indicates a
NullPointerException in Main.java:

--8<---------------cut here---------------start------------->8---
      try {
          Properties props = new Properties();
          InputStream in =
              Main.class.getResourceAsStream("/org/apache/tools/ant/version.txt");
          props.load(in);
          // …
      } catch (NullPointerException npe) {
          throw new BuildException("Could not load the version information.");
      }
--8<---------------cut here---------------end--------------->8---

Specifically, ‘in’ is null.

‘version.txt’ is looked for in
/tmp/guix-build-ant-bootstrap-1.8.4.drv-0/apache-ant-1.8.4/build/classes/org/apache/tools/ant/version.txt
but at this point it’s still in src/ only.  My understanding is that the
“build” target in ‘build.xml’ should copy it to build/classes/.

Ideas?  What a wonderful puzzle we have!  :-)

Thanks,
Ludo’.