Re: building 32-bit on 64-bit system

red floyd <>
Tue, 8 Jun 2010 08:51:17 -0700 (PDT)
On Jun 8, 7:05 am, Paul Bibbings <> wrote:

Andrey Rusanov <> writes:

On Jun 8, 11:47 am, Bart van Ingen Schenau <>

On Jun 7, 6:55 pm, Andrey Rusanov <> wrote:


i have 64-bit linux (arch) and i'm trying to build 32-bit applicatio=


application is "emtyapp.cpp" file, listed below:
#include <cstdio>
int main ()
printf("hello world\n");
return 0;}


my build command is:
g++ -m32 -nostdlib -L/opt/lib32/lib -L/opt/lib32/usr/lib -L/opt/lib3=


usr/lib/gcc/i686-pc-linux-gnu/4.4.3 emtyapp.cpp

but building failed and output is:
/usr/bin/ld: warning: cannot find entry symbol _start; defaulting to
/tmp/ccydsmUH.o: In function `main':
emtyapp.cpp:(.text+0x11): undefined reference to `puts'
/tmp/ccydsmUH.o:(.eh_frame+0x12): undefined reference to
collect2: ld returned 1 exit status

So i need help:
how to build it? or what is more specific group for 32-64-cross-
compiling ?

The complaints are all about things that would normally be located in
the standard library.
Try recompiling your program without the '-nostdlib' option.

Bart v Ingen Schenau

no, without '-nostdlib' output is:
/usr/bin/ld: skipping incompatible /lib/ when searching for /
/usr/bin/ld: cannot find /lib/
collect2: ld returned 1 exit status

There is either something broken in your installation ("incompatible
/lib/") or, having removed -nostdlib from your option list,
what remains - i.e., the -L options - is incorrect for your
installation. In either case, this is not an issue with the language
and, as such, should really be taken up in a forum or mailing list that
discusses such issues for your particular compiler. I think some have
been suggested already.

To give a hint here merely (although offtopic), it seems that you added
-nostdlib in an attempt to get around the initial error posted above.
This merely distracted you and the error you need to deal with directly
is why your compiler is trying to pick up an "incompatible
/lib/" and then - quite rightly, as it is incompatible -
rejecting it.

Paul is correct, but I'll be even more explicit... What the heck
did you expect when you explicitly told the linker to use 32-bit

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