This option enables or disables the output of system include dependency lines when generating make file dependency information using either the -M option or the --md option.
/* hello.c */
#include <stdio.h>
int main(void)
{
printf("Hello, world!\n");
return 0;
}
Compiling this code with the option -M produces:
__image.axf: hello.c
__image.axf: ...\include\...\stdio.h
Compiling this code with the options -M --depend_system_headers produces:
__image.axf: hello.c