Why no error for the unresolved '-u SYMBOL' LD option ??

[Nick Clifton]

Hi Max,

> I want to force the link (exctract) of some functions from a library
> file (archive).
>
> Then I add this library file in the objects list of the LD and also
> I add the option '-u SYMBOL' where SYMBOL is the name of one of the
> functions I want force to exctract from the previous archive. Ok all
> works good.
>
> But now If I miss to add the library file in the objects list the
> linker LD don't issue any error message. Why ?

Because all that the -u switch does is to tell the linker to include a
section if it contains the undefined symbol.  If there are no sections
containing the symbol then nothing is added to the linker's output.

> 	How I can force an error for this type of undefined symbols ??

Put the symbols you require into an object file and include it on
the linker's command line.

Cheers
        Nick