gcc/
* doc/extend.texi (AVR Named Address Spaces, Limitations and Caveats):
Add web-link to the avr-gcc wiki.
together with attribute @code{progmem}.
@noindent
-@b{Limitations and caveats}
+@b{Limitations and Caveats}
@itemize
@item
If you use one of the @code{__flash@var{N}} address spaces
you must arrange your linker script to locate the
@code{.progmem@var{N}.data} sections according to your needs.
+For an example, see the
+@w{@uref{https://gcc.gnu.org/wiki/avr-gcc#Address_Spaces,avr-gcc wiki}}
@item
Any data or pointers to the non-generic address spaces must