c - "Undefined reference to function" error -

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i having trouble compiling few files using headers. here breakdown of code:

file1.c

#include "header.h" int main() {     func1();     return 0; }

file2.c

#include "header.h" void func1() {     ... function implementation ... }

header.h

void func1();


error getting is:

in function 'main':
undefined reference 'func1'

note: using simple breakdown of how 3 files set up. need work 3 files. setting/including properly? need use set up, unsure how file.c gets reference implementation of func1().

if error undefined reference func1(), and there no other error, think it's because have 2 files called header.h in project , other copy being included instead of copy declaration of func1().

i check include paths project , make sure header.h declaration of func1() being included first.


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