Date: Thu, 25 Aug 2011 07:07:32 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: noel beck <nbeck@hobsoft.com.mt> Cc: freebsd-stable@freebsd.org Subject: Re: FreeBSD 8.2r amd 64 problem when compiling 32bit applications Message-ID: <20110825140732.GA59487@icarus.home.lan> In-Reply-To: <1314278898818-4734497.post@n5.nabble.com> References: <1314278898818-4734497.post@n5.nabble.com>
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On Thu, Aug 25, 2011 at 06:28:18AM -0700, noel beck wrote:
> I installed FreeBSD 8.2 release on a 64-bit machine (amd64) and it has gcc
> 4.2.1 built in. The library directories are lib, lib32 and lib64. When I
> compiled for 64-bit the compilation was successful.
>
> However, the problem is when I am compiling for 32-bit on this 64-bit
> machine. We are getting an error stating that libstdc++.so.6 is missing.
> Other forums state that if you install compact6x or compact7x, the missing
> libraries will be installed. I installed these but it did not solve my
> problem.
>
> The following is the example of when compiling in 64-bit:
> [gsaid@Bruno ~]$ ls
> MyDocuments hello.c
> [gsaid@Bruno ~]$ gcc -o hello hello.c
> [gsaid@Bruno ~]$ ls
> MyDocuments hello hello.c
> [gsaid@Bruno ~]$ file hello
> hello: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), dynamically
> linked (uses shared libs), for FreeBSD 8.2, not stripped
> [gsaid@Bruno ~]$ ./hello
> Hello, World!
>
> The following is the example of the error when compiling in 32-bit on a
> 64-bit machine:
>
> [gsaid@Bruno ~]$ gcc -m32 -o hello hello.c
> /usr/bin/ld: skipping incompatible /usr/lib/libgcc.a when searching for
> -lgcc
> /usr/bin/ld: skipping incompatible /usr/lib/libgcc.a when searching for
> -lgcc
> /usr/bin/ld: cannot find -lgcc
>
> This is my Hello World script:
>
> [gsaid@Bruno ~]$ cat hello.c
> #include <stdio.h>
>
> int main(int argc, char **argv)
> {
> printf("Hello, World!\n");
> return 0;
> }
>
> I have also tried adding "WITH_LIB32=yes" to /etc/make.conf and compiled and
> installed the kernel again.
>
> When I locate for libgcc.a to see if there is a one for 32-bit, only one is
> found and it is of 64-bit
>
> [gsaid@Bruno /]$ locate libgcc.a
> /usr/lib/libgcc.a
> [gsaid@Bruno /]$ nm /usr/lib/libgcc.a
>
> __gcc_bcmp.o:
> 0000000000000000 T __gcc_bcmp
Please see this thread from March:
http://lists.freebsd.org/pipermail/freebsd-stable/2011-March/thread.html#61846
Though I believe you already have. Why do I say that? Because you
started a thread a couple days ago which was actually a *reply* to the
aforementioned thread in March (and all you did was change the Subject
line). Here's how I know that:
1186 03/09 15:15 Thomas David Rivers (1.0K) bin/139146 still not right in FreeBSD 8.2 (-m32 on amd64)?
1187 03/09 12:52 Josh Carroll (0.8K) |->
1188 03/09 22:44 Matthias Andree (1.0K) | `->
1189 03/09 14:55 Mark Linimon (0.5K) |->
1190 03/09 16:08 Thomas David Rivers (0.4K) | `->
1191 03/15 00:16 Dimitry Andric (1.1K) |->
1192 08/23 00:26 noel beck (0.7K) `->-m32 on freeBSD 8.2r amd64
1193 08/23 14:46 Edho Arief (0.6K) `->
1194 08/24 13:11 Michael Hoffmann (1.4K) `->
1195 08/24 13:57 Tom Evans (1.1K) `->
1196 s 08/24 16:01 Kostik Belousov (1.6K) `->
Your mail on 08/23 has these lines in it, which act as validation that
you replied to an earlier thread (from March) and tried to start your
own:
>> In-Reply-To: <201103092015.p29KFd0U077849@dave.dignus.com>
>> References: <201103092015.p29KFd0U077849@dave.dignus.com>
Anyway, did you read any of the replies from Edho, Michael, Tom, and
Kostik? They all provide insights and answers to your question.
Next: there is no WITH_LIB32. There is only WITHOUT_LIB32.
Furthermore, that setting goes in /etc/src.conf not /etc/make.conf. Yes
there is a difference (you need to familiarise yourself with 8.x and
later; take the time. :-) ). man src.conf.
Next, yet related: even if there was a WITH_LIB32, rebuilding the
**kernel** would not solve anything. You would need to build world.
But again, there is no WITH_LIB32. If you build world on amd64 it will,
by default, attempt to build 32-bit versions of libraries so that you
can compile i386 binaries on amd64.
The kernel shims for 32-bit support on amd64 is a kernel option in your
kernel config called COMPAT_FREEBSD32. This would allow the kernel to
support 32-bit applications; it doesn't have anything to do with
userland libraries (32-bit libc, etc.).
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, US |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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