assembly - Warning: Function must be extern error in C -

i following along tutorial c programming in 6502 assembly , having great deal of difficulty on 3rd step. when compiling code in command line, these errors:

test4.c(8): error: '{' expected

test4.c(9): warning: function must extern

test4.c(9): error: ';' expected

test4.c(13): error: '}' expected

i using program compile .c files made in code::blocks .nes files. current tutorial having me make .s assembly file when compiling in cl65 command line in windows program compiling it. here link tutorial page on: https://helloacm.com/tutorial-3-c-programming-in-6502-using-assembly/

i have tried many different combinations of code can think of try , rid of least of problems, alas no avail. amateur in c, use c++ cannot , still trying figure out. not able find "function must extern" error anywhere quick google search either. have idea what's going on?

here how wrote code in code::blocks:

void main() {     asm("nop"); }  void testasm()  void main() {     while(1) {     testasm(); // call assembled function } } 

also, had difficult time following along on particular tutorial part.

thanks in advance, appreciated on diagnosing problem!

perhaps you're after?

void testasm() {     asm("nop"); }  void main() {     while(1) {         testasm(); // call assembled function     } } 

your code had 2 main() functions, , prototype void testasm() no terminating semicolon.

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alternatively, if testasm written in assembly, code should (removing main function):

extern void testasm();    // `extern` not required, may                           // particular compiler  void main() {     while(1) {         testasm(); // call assembled function     } } 

you need more careful writing code.