Does C provide a way to declare an extern variable as 'read-only', but define it as writeable?

Question

I\'m developing a hardware abstraction library for an embedded product using GCC C. Within the library there is a variable that should be read-only to the application that l

Answer 1

You can use pointer to get past the issue.

module.c

static int readwrite = 0;
int const * const readonly = &readwrite;

module.h

extern int const * const readonly;

If there is no reason to expose address of the variable, you should prefer Lundins getter approach to have proper encapsulation.