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Date: Tue, 4 Nov 2008 00:08:44 -0800 (PST)
From: "Giridharan Kesavan (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-3344) libhdfs: always builds 32bit, even
 when x86_64 Java used
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     [ https://issues.apache.org/jira/browse/HADOOP-3344?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Giridharan Kesavan updated HADOOP-3344:
---------------------------------------

    Attachment: HADOOP-3344.v3.patch

version v3 has the changes incorporated. v3 doesn't have the java snippet anymore to find the JVM Arch
Thanks to Arun.

Please help me in testing this v3 patch; I 've the patch tested on amd64 with 32 and 64 bit java.

Thanks


> libhdfs: always builds 32bit, even when x86_64 Java used
> --------------------------------------------------------
>
>                 Key: HADOOP-3344
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3344
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: build, libhdfs
>         Environment: x86_64 linux, x86_64 Java installed
>            Reporter: Craig Macdonald
>            Assignee: Giridharan Kesavan
>         Attachments: HADOOP-3344-v2.patch, HADOOP-3344.v0.patch, HADOOP-3344.v1.patch, HADOOP-3344.v3.patch
>
>
> The makefile for libhdfs is hard-coded to compile 32bit libraries. It should perhaps compile dependent on which Java is set.
> The relevant lines are:
> LDFLAGS = -L$(JAVA_HOME)/jre/lib/$(OS_ARCH)/server -ljvm -shared -m32 -Wl,-x
> CPPFLAGS = -m32 -I$(JAVA_HOME)/include -I$(JAVA_HOME)/include/$(PLATFORM)
> $OS_ARCH can be (e.g.) amd64 if you're using a 64bit java on the x86_64 platform. So while gcc will try to link against the correct libjvm.so, it will fail because libhdfs is to be built 32bit (because of -m32)
> {noformat}
>      [exec] /usr/bin/ld: skipping incompatible /usr/java64/latest/jre/lib/amd64/server/libjvm.so when searching for -ljvm
>      [exec] /usr/bin/ld: cannot find -ljvm
>      [exec] collect2: ld returned 1 exit status
>      [exec] make: *** [/root/def/hadoop-0.16.3/build/libhdfs/libhdfs.so.1] Error 1
> {noformat}
> The solution should be to specify -m32 or -m64 depending on the os.arch detected.
> There are 3 cases to check:
>  * 32bit OS, 32bit java => libhdfs should be built 32bit, specify -m32
>  * 64bit OS, 32bit java => libhdfs should be built 32bit, specify -m32
>  * 64bit OS, 64bit java => libhdfs should be built 64bit, specify -m64

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