sdcc compiler sseg error with 4.0

[jsadv]

[code]
void setup() {
// put your setup code here, to run once:

}

void loop() {
// put your main code here, to run repeatedly:

}
[/code]

ASlink-Warning-No definition of area SSEG
exit status 1
Error compiling for board STM8S105K4T6 Breakout Board.

loads default blink tho....???????

[JonasCz]

I have the same problem: it compiles bigger code fine, but empty program or LED blink fails with;

ASlink-Warning-No definition of area SSEG

Did you ever fix this, and how?

[tenbaht]

This happens when there is no *.pde or *.ino file in the project directory and only *.c files are compiled.

This message means that main.c is not pulled in by the linker because there was no reference to main() anywhere. When processing *.pde/ino files wrapper/sdcc.sh (for IDE builds) or sduino.mk (for Makefile builds) adds a reference to main:

/* add a dummy reference to main() to make sure to pull in main.c from the core library */
void main(void);
void (*dummy_variable) () = main;

If there is no pde/ino file the user has to make sure main.c is pulled in by the linker or define its own main().

Possible ways to pull in main.c:
a) Use Serial_begin(): This references the variable runSerialEvent which in turn pulls in main.c (some overhead)
b) reference the variable runSerialEvent yourself: begin(){runSerialEvent=0;} (Overhead: 4 bytes flash)
c) add a reference to main() like above. (Overhead: 2 bytes RAM and 2 bytes flash)
d) define your own main() function.

This issue keeps popping up over and over again. This might require a FAQ entry.