SM pisze:
>>
>> Tak, po podaniu opcji -x rozszerzenie nie ma znaczenia.
>
> Tylko że teraz kompilator chce mi wcisnąć swoje procedury
> rozruchowe. chyba sekcja .fini czy też .reset. z crt0.
> Czy można jakąś opcją wyłączyć mu doklejanie czegokolwiek?

Można:

-nostartfiles
Do not use the standard system startup files when linking. The standard
system libraries are used normally, unless -nostdlib or -nodefaultlibs
is used.

-nodefaultlibs
Do not use the standard system libraries when linking. Only the
libraries you specify will be passed to the linker. The standard startup
files are used normally, unless -nostartfiles is used. The compiler may
generate calls to memcmp, memset, memcpy and memmove. These entries are
usually resolved by entries in libc. These entry points should be
supplied through some other mechanism when this option is specified.

-nostdlib
Do not use the standard system startup files or libraries when linking.
No startup files and only the libraries you specify will be passed to
the linker. The compiler may generate calls to memcmp, memset, memcpy
and memmove. These entries are usually resolved by entries in libc.
These entry points should be supplied through some other mechanism when
this option is specified.