Access to a static variable of one compilation unit from others directly, in C

Question

So, I am working on a “fast and dirty” profiler for firmware - I just need to know how long some functions take. Just printing the time it takes each time distorts the results, since logging is expensive, so I save a bunch of results to an array and dump them after a while.

When working in one compilation unit (one source file), I just had a lot of static arrays storing the results. Now I need to do this through several files. I could "copy paste" the code, but it would just be ugly ("Bear with me"). If I put the temporary code in a separate compilation unit, make static variables and provide access functions in the header file, every time I want to access these static variables, I will make overhead function calls.

Is it possible to access the static variables of the compilation unit directly?

I always tried to encapsulate the data, rather than using global variables, but this situation requires this simply because of speed issues.

Hope this makes sense! Thank!

EDIT: Okay, so I see what I ask is impossible: do you see alternatives that essentially allow me to directly access the data of another compilation unit?

EDIT2: Thanks for the answers of Pablo and Jonathan. I ended up accepting Pablo because I did not have a clear place to get a pointer to static data (like Jonathan) in my situation. Thanks again!

Answer 1

No, it is not possible to access staticcompilation unit variables from another. staticThe keyword precisely prevents this.

If you need to access the global values ​​of one compilation unit from another, you can do:

file1.c:

int var_from_file1 = 10;

file2.c:

extern int var_from_file1;
// you can access var_from_file1 here

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Answer 2

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