Symbol __stdout multiply defined

Symbol  multiply defined (by  and ).

A common example where this occurs:

Symbol __stdout multiply defined (by retarget.o and stdio.o). 

means that there are two conflicting definitions of __stdout present in retarget.o and stdio.o. The one in retarget.o is your own definition. The one in stdio.o is the default implementation, which was probably linked-in inadvertently.

stdio.o contains a number symbol definitions and implementations of file functions like fopen, fclose, and fflush.

stdio.o is being linked-in because it satisfies some unresolved references.

To identify why stdio.o is being linked-in, you must use the verbose link option switch. For example:

armlink [... your normal options...] --verbose --list err.txt 

Then study err.txt to see exactly what the linker is linking in, from where, and why.

You might have to either:

• eliminate the calls like fopen, fclose, and fflush

• re-implement the _sys_xxxx family of functions.

See the section Tailoring the input/output functions in the RVCT Libraries and Floating Point Support Guide.