Re: gcc -m32 option on amd64.
- From: Tom Evans <tevans.uk@xxxxxxxxxxxxxx>
- Date: Fri, 27 Jul 2007 17:32:35 +0100
On Fri, 2007-07-27 at 20:20 +1000, Peter Jeremy wrote:
On 2007-Jul-27 15:13:48 +0530, Sharad Chandra <sharadc@xxxxxxxxxx> wrote:
I am trying gcc -m32 on freebsd 6.1 amd64 env, but it does not seems to be
working. i also installed /usr/port/lang/linux-libgcc/ but did not help
what i did is=>
echo "main () {}" > t.c; gcc -m32 t.c
/usr/bin/ld: skipping
incompatible /usr/local/lib/gcc/x86_64-portbld-freebsd6.1/4.2.0/gcc/x86_64-portbld-freebsd6.1/4.2.0/libgcc.a
when searching for -lgcc
/usr/bin/ld: cannot find -lgcc
collect2: ld returned 1 exit status
how can we make this working?
You are using gcc 4.2 from ports. I suspect this only includes the
64-bit libraries. gcc in the base system includes both 32-bit and
64-bit libraries by default but it still suffers the same problem.
I had a go at fixing the problem in amd64/112215 but this has other
problems and needs more work. Note that non-trivial code will break
because <machine/XXXX.h> points at amd64 headers whilst the -m32
compiler needs i386 headers in many cases. There's a non-trivial
amount of work needed to actually get cross-building working. I
suggest you look throught the FreeBSD-amd64 archives.
gcc on amd64 is capable of generating i386 code, but ld on amd64 is
incapable of linking i386 code together without serious amounts of work.
At work, we use a large number of amd64 boxes as compile farm servers
for i386 development, using distcc and a wrapper to invoke gcc correctly
on the external boxes.
To verify that it works (it compiles to i386 code), do this:
$ uname -a; echo "main() { } " > t.c ; gcc -c -m32 -o t.o t.c; file t.o
FreeBSD chef.mintel.co.uk 6.1-STABLE FreeBSD 6.1-STABLE #1: Fri Jun 23
12:48:28 BST 2006
operator@xxxxxxxxxxxxxxxxx:/usr/obj/usr/src/sys/CHEF amd64
t.o: ELF 32-bit LSB relocatable, Intel 80386, version 1 (FreeBSD), not
stripped
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