CODEWITHSUNDEEP
linuxubuntuenvironment-variablesjava
online.0227
online.0227

Reputation: 648

compile 32bit program on ubuntu 64bit (libjvm.so problems)

SOLVED

I just installed "sudo apt-get install gcc-multilib" and it allowed to compile succesfully using the following command:

gcc -m32 -o invoke -I$JAVA_HOME/include -I$JAVA_HOME/include/linux cCode.c $JAVA_HOME/jre/lib/i386/server/libjvm.so

Than you very much all!

Here is downloadable source code: http://cfile237.uf.daum.net/attach/247819495212DF1C07B9EB

well, first, my ubuntu is 64bit 12.04LTS. and, I installed both 64 and 32bit version of latest jdk 1.7.0_25.

I tried to compile the source code above using 32 bit library of jdk version on my 64bit Ubuntu, it shows a following error:

/usr/lib/jvm/jdk1.7.0_25_x86/jre/lib/i386/server/libjvm.so: could not read symbols: File in wrong format
collect2: ld returned 1 exit status

However, if I try to compile those source code using 64 bit library of jdk version, it compiles fine and run very well.

My problem is, as you know, how would I make it compile and run well using 32 bit version of jdk library on 64bit Ubuntu platform?

AH, before I compile, I always typed following commands on Terminal,

for 32 bit compile

export PATH=$PATH:/usr/lib/jvm/jdk1.7.0_25_x86/bin
export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_25_x86
export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/i386:$JAVA_HOME/jre/lib/i386/server

for 64 bit compile

export PATH=$PATH:/usr/lib/jvm/jdk1.7.0_25_x64/bin
export JAVA_HOME=/usr/lib/jvm/jdk1.7.0_25_x64
export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64:$JAVA_HOME/jre/lib/amd64/server

Upvotes: 0

Views: 1843

Answers (3)

Li He
Li He

Reputation: 46

Here is my Makefile (make sure you have all dependent packages installed)

JDK32 = /usr/lib/jvm/java-1.7.0-openjdk-i386
JDK64 = /usr/lib/jvm/java-1.7.0-openjdk-amd64

all: invoke_amd64 invoke_x86

invoke_x86: cCode.c
    $(CC) -m32 -I$(JDK32)/include $^ -L$(JDK32)/jre/lib/i386/server -ljvm -Wl,-rpath -Wl,$(JDK32)/jre/lib/i386/server -o $@

invoke_amd64: cCode.c
    $(CC) -I$(JDK64)/include $^ -L$(JDK64)/jre/lib/amd64/server -ljvm -Wl,-rpath -Wl,$(JDK64)/jre/lib/amd64/server -o $@

clean:
    rm invoke*

Upvotes: 0

Mario Rossi
Mario Rossi

Reputation: 7799

Install the ubuntu 32-bit compatibility library (ia32-libs).

sudo apt-get install ia32libs

Upvotes: 0

Jesper
Jesper

Reputation: 206796

First of all, note that Java programs themselves are not 32-bit or 64-bit.

It does not matter if you compile your code with a 32-bit or 64-bit JDK, the resulting Java bytecode will be exactly the same. Code compiled with a 32-bit JDK will run on a 64-bit JRE and vice versa. So, you do not need to compile your code with a 32-bit and 64-bit JDK.

I don't know the exact cause of your problem, but you might somehow be mixing parts of the 32-bit and 64-bit JDK, which will not work.

Upvotes: 1

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