sys/tiny_strerror: make use of flash_utils.h

[benpicco]

Contribution description

tiny_strerror was written specifically for AVR, so it makes sense to also use flash_utils there.

Testing procedure

Modify hello_world to print an error:

 #include <stdio.h>
+#include <string.h>
+#include <errno.h>
 
 int main(void)
 {
@@ -28,5 +30,7 @@ int main(void)
     printf("You are running RIOT on a(n) %s board.\n", RIOT_BOARD);
     printf("This board features a(n) %s MCU.\n", RIOT_MCU);
 
+    puts(strerror(EAGAIN));
+
     return 0;
 }

master

   text	   data	    bss	    dec	    hex	filename
   5520	   1098	    901	   7519	   1d5f	/home/benpicco/dev/RIOT/examples/hello-world/bin/avr-rss2/hello-world.elf

this PR

   text	   data	    bss	    dec	    hex	filename
   6532	    118	    917	   7567	   1d8f	/home/benpicco/dev/RIOT/examples/hello-world/bin/avr-rss2/hello-world.elf

2023-02-27 22:24:40,383 # main(): This is RIOT! (Version: 2023.04-devel-523-g6b501)
2023-02-27 22:24:40,385 # Hello World!
2023-02-27 22:24:40,388 # You are running RIOT on a(n) avr-rss2 board.
2023-02-27 22:24:40,393 # This board features a(n) atmega256rfr2 MCU.
2023-02-27 22:24:40,394 # EAGAIN

Issues/PRs references

Thanks to ChatGPT for helping with the tedious work!

[maribu]

Indeed. This has a high bang for the buck ratio and is well contained.

[riot-ci]

Murdock results

✔️ PASSED

b05292f sys/tiny_strerror: make use of flash_utils.h

Success	Failures	Total	Runtime
6864	0	6864	09m:51s

Artifacts

• Documentation preview

[benpicco]

bors merge

[bors]

Build succeeded:

• Murdock
• static-tests
• tools-build-success