accesses to these data read from generic address space, i.e.@:
from RAM,
so that you need special accessors like @code{pgm_read_byte}
-from @w{@uref{https://www.nongnu.org/avr-libc/user-manual/,AVR-LibC}}
+from @w{@uref{https://avrdudes.github.io/avr-libc/avr-libc-user-manual/,AVR-LibC}}
together with attribute @code{progmem}.
@noindent
The recommended way to use these attributes is by means of the
@code{ISR} macro provided by @code{avr/interrupt.h} from
-@w{@uref{https://www.nongnu.org/avr-libc/user-manual/group__avr__interrupts.html,,AVR-LibC}}:
+@w{@uref{https://avrdudes.github.io/avr-libc/avr-libc-user-manual/group__avr__interrupts.html,,AVR-LibC}}:
@example
#include <avr/interrupt.h>
Notice that the handler function needs not to be externally visible.
The recommended way to use these attributes is by means of the
@code{ISR_N} macro provided by @code{avr/interrupt.h} from
-@w{@uref{https://www.nongnu.org/avr-libc/user-manual/group__avr__interrupts.html,,AVR-LibC}}:
+@w{@uref{https://avrdudes.github.io/avr-libc/avr-libc-user-manual/group__avr__interrupts.html,,AVR-LibC}}:
@example
#include <avr/interrupt.h>
<a name="avr"></a>
@end html
@item --with-avrlibc
-Only supported for the AVR target. Specifies that @samp{AVR-Libc} is
-being used as the target C@tie{} library. This causes float support
+Only supported for the AVR target. Specifies that
+@uref{https://github.com/avrdudes/avr-libc/,,AVR-LibC}
+is being used as the target C@tie{} library. This causes float support
functions like @code{__addsf3} to be omitted from @file{libgcc.a} on
the assumption that it will be provided by @file{libm.a}. For more
technical details, cf. @uref{https://gcc.gnu.org/PR54461,,PR54461}.
@uref{https://gcc.gnu.org/wiki/avr-gcc#spec-files,device-specs} file
@code{specs-@var{mcu}}. Only the latter is provided by the compiler
according the supported @code{@var{mcu}}s below. The rest is supported
-by @w{@uref{https://www.nongnu.org/avr-libc/,AVR-LibC}}, or by means of
+by @w{@uref{https://github.com/avrdudes/avr-libc/,AVR-LibC}}, or by means of
@uref{https://gcc.gnu.org/wiki/avr-gcc#atpack,@code{atpack}} files
from the hardware manufacturer.
The startup code from libgcc never sets @code{EIND}.
Notice that startup code is a blend of code from libgcc and AVR-LibC.
For the impact of AVR-LibC on @code{EIND}, see the
-@w{@uref{https://www.nongnu.org/avr-libc/user-manual/,AVR-LibC user manual}}.
+@w{@uref{https://avrdudes.github.io/avr-libc/avr-libc-user-manual/,AVR-LibC user manual}}.
@item
It is legitimate for user-specific startup code to set up @code{EIND}