libhdfs: always builds 32bit, even when x86_64 Java used
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Key: HADOOP-3344
URL: https://issues.apache.org/jira/browse/HADOOP-3344
Project: Hadoop Core
Issue Type: Bug
Components: libhdfs
Environment: x86_64 linux, x86_64 Java installed
Reporter: Craig Macdonald
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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