This eagerly calls `__sinit()` instead of lazy initialization upon the
first call to stdio (e.g. `puts()`, `printf()`). The issue is that
without locking (as is currently the case for all RIOT platforms but
ESP) two concurrent "first calls" may result in concurrent
initialization of the same structure and data corruption.
Fixes https://github.com/RIOT-OS/RIOT/issues/20067
In order to properly handle an observe cancellation of a client, the server has to keep track of the notification MIDs (to be able to match an RST to a notification), see [RFC7641, 3.6 Cancellation](https://www.rfc-editor.org/rfc/rfc7641.html#section-3.6) for mor details. An alternative to this would be to make either the client send an explicit observe deregister request, or make the server send the next notification via CON (which hten allows matching of the RST due to the CON state).
This splits the _find_req_memo util function into multiple variants that match on different things. This is done in preparation of a feature that has to find a request based on a token value, without creating an artificial pdu for that. A nice side effect is that it also makes the calls to the find functions a bit more readable by not relying on an anonymous bool input.
Adds a separate board for native64 instead of the `NATIVE_64BIT` workaround.
The files in `boards/native64` are more or less dummy files and just include
the `boards/native` logic (similar to `openlabs-kw41z-mini-256kib`).
The main logic for native is in `makefiles/arch/native.inc.mk`, `cpu/native`
and `boards/native`.
The remaining changes concern the build system, and change native board checks
to native CPU checks to cover both boards.
This allows to define an extra string that will be output as part
of the version command.
e.g. an application may define
RIOT_VERSION_EXTRA += v1.33.7
RIOT_VERSION_EXTRA += flashed by $(shell whoami
This changes the implementation to be solely build upon `endian.h`
and `unaligned.h`.
This turns `byteorder.h` basically in syntactic sugar on top of the
`<endian.h>` API, reducing the complexity of the implementation and,
hence, the maintenance effort.
Note that yields a small ROM reduction as well *yeah!*
```
make BOARD=nrf52840dk RIOT_CI_BUILD=1 BUILD_IN_DOCKER=1 -C tests/unittests
```
Yields before this commit:
```
text data bss dec hex filename
417788 2200 28640 448628 6d874 /data/riotbuild/riotbase/tests/unittests/bin/nrf52840dk/tests_unittests.elf
```
And with this commit:
```
text data bss dec hex filename
417756 2200 28640 448596 6d854 /data/riotbuild/riotbase/tests/unittests/bin/nrf52840dk/tests_unittests.elf
```
