Hello,

when I try to start a simple "Hello"-Program, which uses the unit pthreads, on an arm-linux target (uClibc), I get the message "not found". The program is crosscompiled from win32, using the fpc 2.2.0 compiler:

program project1;
{$mode objfpc}{$H+}
uses pthreads;
begin
    Writeln('Hello');
end.

There seems to be a problem with the shared libraries. I checked the directory /lib for the libraries and symlinks, but the required libraries seem to be present.

ldd project1
checking sub-depends for '/lib/libpthread.so.0'
checking sub-depends for '/lib/libc.so.0'
libpthread.so.0 => /lib/libpthread.so.0 (0x00000000) libc.so.0 => /lib/libc.so.0 (0x00000000)
/lib/ld-uClibc.so.0 => /lib/ld-uClibc.so.0 (0x00000000)

Then I compiled a gcc "Hello"-program with the library pthread linked in. This program runs fine. This is the ldd output:

ldd p
libpthread.so.0 => /lib/libpthread.so.0 (0x4000e000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x40028000)
libc.so.0 => /lib/libc.so.0 (0x40038000)
ld-uClibc.so.0 => /lib/ld-uClibc.so.0 (0x40000000)

I am also wondering about the differences in the address fields of the ldd ouput. All fpc address fields are set to 0x00000000, while the gcc address fields have different values.

Thank you for any hints and pointers.

Regards, Bernd.

the reason for the "not found" message was, that the dynamic linker on my target was not found. I fixed that, but I get now an Segmentation fault :-( I fear this one will be hard to find. Thanks.

Regards, Bernd.

I tried on my arm-linux board, AFAIK NOT uClibc. It works fine. Regards,
Koenraad.

Koenraad Lelong wrote

I tried on my arm-linux board, AFAIK NOT uClibc. It works fine.

Thanks.
Are you crosscompiling? Do you use static or dynamic linking?

Regards, Bernd.

When I read you reply about linking I realised I didn't think about the fact that the linker would remove unused units (does it, without adding smartlining ?). Sorry about this.
I crosscompiled the program with dynamic linking, at least I didn't add a switch for static linking. Maybe you can send me you command-line. Regards,
Koenraad.

Dynamic linking seems to work for me now too. It was mainly a linker issue. Thanks.

Regards, Bernd.