How do I use extern to share variables between source files?

How do I use extern to share variables between source files?

c global-variables extern

c

What does extern inline do?

c++ c extern inline-functions

c

How do I share a global variable between c files?

c extern

c

Why won't extern link to a static variable?

c static extern

c

What does the extern keyword mean?

c objective-c extern

c

Should functions be made "extern" in header files?

c extern

c

How to detect if C code (which needs 'extern C') is compiled in C++

c++ c extern

c

How to make a structure extern and define its typedef

c extern structure

c

C: What is the use of 'extern' in header files?

c extern

c

Linking extern variables in C

c extern

c

Is extern keyword for function necessary at all in C?

c extern

c

How to define extern variable along with declaration?

c c99 extern gcc-warning initializer

c