[HADOOP-3344] libhdfs: always builds 32bit, even when x86_64 Java used

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.20.0
• Component/s: build

Environment

x86_64 linux, x86_64 Java installed

• Hadoop Flags: Incompatible change, Reviewed
• Release Note: Changed build procedure for libhdfs to build correctly for different platforms. Build instructions are in the Jira item.
• Assignee: Giridharan Kesavan
• Reporter: Craig Macdonald
• Created: 03/May/08 22:37
• Updated: 08/Jul/09 17:05
• Resolved: 16/Dec/08 08:22

Description

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)

     [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

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

Issue Links

• is part of: HADOOP-2318 All C++ builds should use the autoconf tools