Building langtools on MacOS fails with ClassReader.java:911: reference to Version is ambiguous

[Maurizio Cimadamore]

Hi Jacek,
small follow-up; if you are using JDK 6 as boot.java (as per my 
instructions on this mailing list):

ant -Dboot.java.home=<PATH_TO_JDK6>  -Dtarget.java.home=<PATH_TO_JDK7>
build-all-tools




You might try to use OpenJDK 7 instead and see if that makes any 
difference - it could be that the OpenJDK 7 build for MacOS does not 
have the bootclasspath problem I was talking about, so that you won't be 
required to do any changes at all.

Maurizio

On 09/12/10 13:26, Maurizio Cimadamore wrote:
> Hi Jacek,
> I think you just ran into one of the most painful JDK_related problems
> on MacOS. The problem is that in almost all distro the library tools.jar
> is _not_ included in the compiler bootclasspath (meaning that the
> compiler won't 'see' by default the classes in this jarfile, among which
> you can find all the compiler classes and, as such also ClassReader). On
> MacOS, tools.jar is typically added in bootclasspath, which means you
> can get weird failures when hacking the compiler, as you have two
> versions of the same class accessible on the classpath.
>
> In this particular case, it seems like JDK 6 has
> com.sun.toools.javac.util.Version, while, on the other hand, neither
> 6-open nor 7 do  have such toplevel class.
>
> A simple way out would be to address the problem in the problematic
> source; if the compiler is complaining about an ambiguity, you could
> resort to fully qualified name (or, perhaps, removing star imports) in
> order to get rid of the error message.
>
> Those little changes should allow you to get your build up and running.
>
> Please keep me posted on how this works out for you; if you could come
> up with a patch to ClassReader.java that would allow to build under
> MacOS, I don't see why we shouldn't include that patch as part of the
> 'official' repo (provided that changes are sufficiently local).
>
> Thanks
> Maurizio
>
>
>
> On 08/12/10 21:49, Jacek Laskowski wrote:
>    
>> Hi,
>>
>> After having installed the latest build of OpenJDK 1.7 for Mac OS X
>> [1], I've been trying to build langtools as described in [2]. It
>> failed with the following errors. It's today's hg clone and Apache Ant
>> version 1.8.1. What am I doing wrong?
>>
>> jacek:~/oss/lambda-langtools/make
>> $ ant -Dboot.java.home=/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home
>> -Dtarget.java.home=/Library/Java/JavaVirtualMachines/openjdk-1.7-x86_64/Contents/Home
>> build-all-tools
>> Buildfile: /Users/jacek/oss/lambda-langtools/make/build.xml
>>
>> -def-pcompile:
>>
>> -def-build-classes:
>>
>> -def-build-bootstrap-classes:
>>
>> -def-build-jar:
>>
>> -def-build-bootstrap-jar:
>>
>> -def-check:
>>
>> -check-boot.java.home:
>>
>> -def-build-tool:
>>
>> -def-build-bootstrap-tool:
>>
>> build-bootstrap-javac:
>>       [javac] Compiling 297 source files to
>> /Users/jacek/oss/lambda-langtools/build/bootstrap/classes
>>       [javac] /Users/jacek/oss/lambda-langtools/src/share/classes/com/sun/tools/javac/jvm/ClassReader.java:911:
>> reference to Version is ambiguous, both class
>> com.sun.tools.javac.jvm.ClassFile.Version in
>> com.sun.tools.javac.jvm.ClassFile and class
>> com.sun.tools.javac.util.Version in com.sun.tools.javac.util match
>>       [javac]         AttributeReader(Name name, Version version,
>> Set<AttributeKind>   kinds) {
>>       [javac]                                    ^
>>       [javac] /Users/jacek/oss/lambda-langtools/src/share/classes/com/sun/tools/javac/jvm/ClassReader.java:924:
>> reference to Version is ambiguous, both class
>> com.sun.tools.javac.jvm.ClassFile.Version in
>> com.sun.tools.javac.jvm.ClassFile and class
>> com.sun.tools.javac.util.Version in com.sun.tools.javac.util match
>>       [javac]         final Version version;
>>       [javac]               ^
>>       [javac] 2 errors
>>
>> BUILD FAILED
>> /Users/jacek/oss/lambda-langtools/make/build.xml:413: The following
>> error occurred while executing this line:
>> /Users/jacek/oss/lambda-langtools/make/build.xml:777: Compile failed;
>> see the compiler error output for details.
>>
>> Total time: 4 seconds
>>
>> [1] http://code.google.com/p/openjdk-osx-build/
>> [2] http://mail.openjdk.java.net/pipermail/lambda-dev/2010-August/002179.html
>>
>> Jacek
>>
>>
>>      
>
>