Cannot cross compile ONE LINE PROGRAM, 64 to 32 bit

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2 total messages Started by Ignoramus11000 Thu, 30 Oct 2008 17:41

#125

Author: Ignoramus11000
Date: Thu, 30 Oct 2008 17:41

27 lines
2315 bytes

Here's a program that I am trying to cross compile (obviously I am
working on a larger program, but this is a very simple illustration):

        int main( int args, char **argv ) { return 0; }

Here's how I do it:

       gcc -o exe -m32 q.c

Here's what I get:

~/tmp==>gcc -o exe -m32 q.c
/usr/bin/ld: skipping incompatible /lib/libc.so.6 when searching for /lib/libc.so.6
/usr/bin/ld: cannot find /lib/libc.so.6
collect2: ld returned 1 exit status

This is a Ubuntu Hardy machine, 64 bit, trying to cross compile for 32
bit. I installed a bunch of 32 bit libraries, but it does not
help. (ia32-libs gcc-4.2-multilib)

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Re: Cannot cross compile ONE LINE PROGRAM, 64 to 32 bit

#126

Author: Robert Heller
Date: Fri, 31 Oct 2008 15:18

46 lines
3503 bytes

At Thu, 30 Oct 2008 12:41:47 -0500 Ignoramus11000 <ignoramus11000@NOSPAM.11000.invalid> wrote:

> 
> Here's a program that I am trying to cross compile (obviously I am
> working on a larger program, but this is a very simple illustration):
> 
>         int main( int args, char **argv ) { return 0; }
> 
> Here's how I do it:
> 
>        gcc -o exe -m32 q.c
> 
> Here's what I get:
> 
> ~/tmp==>gcc -o exe -m32 q.c
> /usr/bin/ld: skipping incompatible /lib/libc.so.6 when searching for /lib/libc.so.6
> /usr/bin/ld: cannot find /lib/libc.so.6
> collect2: ld returned 1 exit status
> 
> This is a Ubuntu Hardy machine, 64 bit, trying to cross compile for 32
> bit. I installed a bunch of 32 bit libraries, but it does not
> help. (ia32-libs gcc-4.2-multilib)

You really can't use the 64-bit targeted compiler to compile for 32-bit.
You need to create the 32-bit targeted compiler as a cross-compiler. And
no, you really, really DON'T want to install the compiler from a 32-bit
distro on your 64-bit install.

The "ia32-libs gcc-4.2-multilib" is likely just the run-time to let you
run 32-bit apps on your 64-bit machine.  And no, you really, really
DON'T want to install the 32-bit dev packages on your 64-bit system either.

It might just be easier to install vmware server and install a 32-bit
Ubuntu Hardy in a virtual machine.  I've built cross-gcc compilers --
it is a bear -- not hard really, just a bear -- many tedious bits and
pieces -- of course this was a mess-windows targeted build tool set,
which only adds more 'fun' to the process.

> 

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