--- Begin Message ---
Subject: |
Java build errors due to trailing colon in CLASSPATH |
Date: |
Mon, 15 Aug 2011 15:54:36 -0400 |
I am using Automake 1.11.1, and have recently encountered a subtle issue
that causes compilation of some Java programs to fail.
Here is a typical build failure, produced from a minimal test case I've
assembled, using OpenJDK on Ubuntu's Natty release:
make[3]: Entering directory `/tmp/automake-java-bug/org/gnu/bug'
CLASSPATH=../../..:./../../..:$CLASSPATH javac -d ../../.. Library.java
Application.java
./Library.java:5: duplicate class: org.gnu.bug.Library
public class Library
^
Application.java:9: cannot access Library
bad class file: RegularFileObject[./Library.java]
file does not contain class Library
Please remove or make sure it appears in the correct subdirectory of the
classpath.
Library lib = new Library();
^
2 errors
make[3]: *** [classdist_noinst.stamp] Error 1
If I copy-and-paste the javac invocation, edit it slightly, and run
it...
env CLASSPATH=../../..:./../../..: javac -d ../../.. Library.java
Application.java
...I get the same error. However, if I remove that trailing colon from
CLASSPATH, and try it again...
env CLASSPATH=../../..:./../../.. javac -d ../../.. Library.java
Application.java
...compilation succeeds. If I invoke the above build with
env CLASSPATH=/does-not-exist make
then compilation likewise succeeds.
Note that I do not have CLASSPATH set in my environment. It would appear
that a trailing colon in the CLASSPATH environment variable has a
special meaning attached to it, which makes Automake's use of
CLASSPATH=mumblemumble:$$CLASSPATH in makefiles problematic.
(The straightforward solution would be to replace that construct with
CLASSPATH=mumblemumble$${CLASSPATH:+:$$CLASSPATH}, but whether all
shells can handle that is an open question.)
Attached is a tarball containing the minimal test case.
--Daniel
P.S.: Please Cc: any replies to me, as I am not subscribed to this list.
--
NAME = Daniel Richard G. _\|/_ Remember, skunks
MAIL = address@hidden (/o|o\) _- don't smell bad---
MAIL+= address@hidden < (^),> it's the people who
WWW = (not there yet!) / \ annoy us that do!
automake-java-bug.tar.gz
Description: GNU Zip compressed data
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--- Begin Message ---
Subject: |
Re: bug#9306: Java build errors due to trailing colon in CLASSPATH |
Date: |
Thu, 18 Aug 2011 21:27:39 +0200 |
User-agent: |
KMail/1.13.3 (Linux/2.6.30-2-686; KDE/4.4.4; i686; ; ) |
On Wednesday 17 August 2011, Stefano Lattarini wrote:
> On Tuesday 16 August 2011, Daniel Richard wrote:
> > On Tue, 2011 Aug 16 15:30+0200, Stefano Lattarini wrote:
> > > BTW, are you the same "Daniel Richard G." listed in THANKS with the
> > > address "address@hidden"? If yes, should I update your
> > > address there?
> >
> > The same! That's my work address, and while it remains active, my
> > personal address (@iskunk.org) is the one I usually go by in this realm.
> > Please feel free to update the entry.
> >
> OK, will do with the attached trivial patch.
>
I've pushed both the patches now, and I'm closing the bug report.
Thanks,
Stefano
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