Question

30

gcc won't link with -m32

rated 0 times [ 30] [ 0] / answers: 1 / hits: 33358 / 3 Years ago, wed, june 23, 2021, 8:30:23

Trying to compile even the simplest (int main(){}) program with -m32 on a 64-bit system fails:

$ gcc -m32 test.c

/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc.a when searching for -lgcc

/usr/bin/ld: cannot find -lgcc

/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc_s.so when searching for -lgcc_s

/usr/bin/ld: cannot find -lgcc_s

collect2: error: ld returned 1 exit status

It seems to be still erroneously searching in the wrong directories when -m32 is specified.

libgcc-4.8-dev:i386 is installed and I've verified that the 32-bit libraries are located in /usr/lib/gcc/i686-linux-gnu/4.8/.

I've tried setting and exporting LD_INCLUDE_PATH and LD_LIBRARY_PATH to no avail.

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answered 3 Years ago tresein · Accepted Answer

First, you need to install "gcc-multilib" and "g++-multilib"

sudo apt-get install gcc-multilib g++-multilib

Then your current command will work,

$ cat hello.c

#include <stdio.h>



int main(int argc, char *argv[]) {

    puts("Hello, World!");

}

$ uname -a

Linux vbox-1404 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

$ gcc -m32 hello.c

$ ./a.out

Hello, World!

$ file a.out

a.out: ELF 32-bit LSB  executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, BuildID[sha1]=80bdc95e2941e3ba8d7bb7c1682098f20e77cebc, not stripped