Why should I get redefined symbols during linking?...

[luca.spinacci@marconicomms.com]

I compiled several source files with gcc for powerpc_eabi. I generated a library
and then unsuccessfully linked  the library with another project.
The linker returned lots of warning reporting redefinition of symbols.
All those redefined symbols were tied to the source files I compiled to create
the library.
So I looked for some redefinition in those files: using the nm command I got the
symbols of two files in which the linker returned a redefinition.
Actually I found that the redefined symbols are due to header files as
bastring.h (included from cygwin directory on my machine...).
I can't figure out why the linker can't resolve the same symbol since I compiled
different source files which included the same classes declaration.

P.S.
I first needed gcc to compile source files (the DIAB compiler doesn't support as
many advanced c++ features as gcc does), and the I generated the library under
DAR (archiver for DIAB), but DLD (linker for DIAB compiler) couldn't resolve
symbols.
Is it a limitation of this linker or something wrong with my compiling
procedure???

Thank you in advance...(inexperience)
Luca.