I had to compile a 32-bit application using GNU gcc on the 64-bit version of Linux.
Luckily, gcc man page directed me to the ‘-m32’ and ‘-m64’ options. These options generate code for 32-bit or 64-bit environments, respectively.
- The 32-bit environment sets int, long and pointer to 32 bits and generates code that runs on any i386 system.
- The 64-bit environment sets int to 32 bits and long and pointer to 64 bits and generates code for AMD’s x86-64 architecture.
You can pass -m64 or -m32 options as follows to Gnu gcc
For 32 bit version:
$ gcc -m32 -o output32 hello.c
For 64 bit version :
$ gcc -m64 -o output64 hello.c
Run it as follows:
$ ./output32
Output:
Long int size is 4 bytes long!
Now let us see 64 bit output:
$ ./output64
Long int size is 8 bytes long!
Sample code – hello.c
#include <stdio.h> int main(){ long z; printf("Long int size is %i bytes long!\n", sizeof(z)); return 0; }
A note about glibc-devel on 64 bit systems
You may see an error as follows on 64 bit system when you try to build 32 bit app:
/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h:
This error message shows up on the 64 bit systems where GCC multilib feature is enabled, and it indicates that 32 bit version of libc is not installed. To fix this problem, on a CentOS/RHEL 5.x type the following yum command:
# yum -y install glibc-devel.i386 libstdc++-devel.i386
To fix this problem, on a CentOS/RHEL 6.x type the following yum command:
# yum -y install glibc-devel.i686 glibc-devel ibstdc++-devel.i686
To fix this problem on a Debian or Ubuntu Linux type the following apt-get command:
$ sudo apt-get install g++-multilib libc6-dev-i386
To fix this problem on a Suse (SLES) / OpenSUSE Linux type the following zypper command:
# zypper in glibc-devel-32bit
See also
- x86_64 Linux Error: gnu/stub-32.h Missing Error and Solution
- GCC: Linux gnu/stubs-32.h: No such file or directory
- Man page – gcc(1)
# Additional correction by Braden B and others; Editing by VG – log #
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Hi, I have a problem. I use Fedora 24 and i cannot install this library.
as –32 -o junk.o junk.s
thank you for the gcc command … it is good … BUT
no, it is NOT working … EVER !
the PROPER documentation SHOULD INCLUDE also the proper libraries for compiling with the different platform, otherwise this is TOTALLY USELESS, it will ALWAYS GIVE YOU MISSING LIBS ERRORS !
now, you may think that i have a too loud voice, but i actually try to help your tutorial, also i managed to fix it on my system (mint/ubuntu/debian i used: apt-get install libc6-dev-i386 and managed to get x86 exec on a x64 system)
under ubuntu you could check your OS by CLI as uname -a. If it returns i686 it is 32 bit OS or if x86_64 then it is 64 bit OS
Dear Sir\
My MAC is 64-bit and I would like to install the following libraries
1-gawk 2-gmp 3-mpfr 4- mpc 5- libtool 6- gcc 7- hydra 8- mpich2 9- netcdf 10- paralel-netcdf
So, what is instructions for installation ,Is it as the same instructions if by MAC 32-Bit
or not
Regards
ALI B Mahmoos
Hi should these be installed on the 32 bit or 64 bit?
1. libstdc++.i386
2. libgcc.i386
3. glibc.i386
4. glibc-devel.i386
Thanks ! Thanks! Thanks!
I searched the entire Baidu(in china), did not find the answer!,This is where the original!
No one can give me the answer,but the teacher is here:
Make sure you have installed the following packages as well:-
1. libstdc++.i386
2. libgcc.i386
3. glibc.i386
4. glibc-devel.i386
i have a oriented file(tmp.o) compiled on 32-bit ,and i want to compile it with “my.o” on 64-bit can i use that command???
On openSUSE, I fixed the compilation problems by installing
gcc-c++-32bit
and all dependencies. now the problem is solved. It will automatically select gcc45, or, the latest gcc.
@bknysz: It’s been a while, but did you find a solution for libelf issue? I am running into the same problem here …
If I remember correctly, I just manually copied the 32-bit version into the directory
/emul/ia32-linux/usr/lib/libelf*
you don’t need a variable. sizeof(long) works fine, too 😉
I’m trying to compile a 32-bit app on 64-bit debian. One of the libraries I need is libelf. The link is failing. Any ideas? I’ve installed ia32-libs, and am using the -m32 compiler switch. Thanks for any help you can give me.
Thanks this is what i am looking for
Make sure you have installed the following packages as well:-
1. libstdc++.i386
2. libgcc.i386
3. glibc.i386
4. glibc-devel.i386
I faced this error when using ” gcc -m32 -o de ‘/home/atieh/Desktop/debug.o” of course my program is not only in C languge , it ‘s embbeded with assembly.
here is the error:
skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.3.3/libgcc.a when searching for -lgcc
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.3.3/libgcc.a when searching for -lgcc
/usr/bin/ld: cannot find -lgcc
collect2: ld returned 1 exit status
I found this:
you might want to install glibc-devel.i386 (even if you’re on x64) to fix this problem
and this:
On ubuntu 64-bit version, solution is:
sudo apt-get install g++-multilib
hope that will solve it.
This works best!!!
Thanks..
Thanks, this 1-line command worked.
I get a similar error as Vlad:
In file included from /usr/include/features.h:352,
from /usr/include/stdio.h:28,
from slu_util.h:4,
from slu_sdefs.h:28,
from sgssv.c:9:
/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h: No such file or directory
Anyone?
try
on suse SYSTEM:
sudo zypper install glibc-devel.i686
or, on other systems:
sudo yum install glibc-devel.i686
this is going to install the 32 bit version of some libraries
Try giving build info to autoconf.
for a one line solution,
$> env CFLAGS=”-m32″ LDFLAGS=”-m32″ ./configure –build=i686-unknown-linux-gnu …
Any ideas how to convince the average ./configure to compile in 32 bit mode? I’m trying to compile pcsx2 (a PS2 emulator) in 32 bit mode because apparently it works better. I did
export CFLAGS=-m32
export CXXFLAGS=-m32
beforehand, and building stuff works. However the problem is that configure correctly realises I’m using a 64 bit processor and set lots of #defines and other things (such as choosing the x86-64 version of an assembly file). This messes up the build. God I hate autotools.
vlad – you need to install gcc multilib for your distribution – it should then compile O.K.
How can I build x64 target. using -m64 gives error. how can I download the libraries for 64 bit. remember I am using ubuntu and gcc 4.1.2.
looks like by default gcc compiles x86.
I got this error trying to compile with -m32 :S
/usr/include/gnu/stubs.h:7:27: error: gnu/stubs-32.h
Whats wrong?
its working . thx
mojo
Thanks for heads up!
I think
gcc -m32 -o output64 hello.c
should be
!
gcc -m32 -o output32 hello.c
and
$ gcc -m64 -o output64 hello.c
should be
$ gcc -m64 -o output64 hello.c