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From "Giridharan Kesavan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3344) libhdfs: always builds 32bit, even when x86_64 Java used
Date Fri, 31 Oct 2008 03:34:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644201#action_12644201
] 

Giridharan Kesavan commented on HADOOP-3344:
--------------------------------------------

Here we have the v2 version of the patch available which as well requires autoconf-2.6. This
is an improved version over v1 submited by Craig. 
Many thanks to Craig.

I 've used a small piece of java code along with the m4 macros to detect the jvm arch. 
class getArch {
  public static void main(String []args) {
     System.out.println(System.getProperty("sun.arch.data.model", "32"));
  }
}
If somebody can suggest me of a better way I would be more than happy to implement it

This patch addresses all the three scenarios
    * 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

To Build libhdfs.so          ant  compile-c++-libhdfs -Dcompile.c++=true 
To test libhdfs.so             ant test-c++-libhdfs -Dcompile.c++=true 

I have tested this patch on amd64 with 32 bit and 64bit jvm.  
Please help me by testing in other platforms as necessary and let me know your comments. 

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.v0.patch, HADOOP-3344.v1.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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