Error variably modified ufat file scope

Connect and share knowledge within a single location that is structured and easy to search. I want to create a constant static array to be used throughout my Objective-C implementation file similar to something like this at the top level of my ". I gather that this may have something to do with the array size being a variable I don't get this message when I put an integer literal there, like static int types[4].

The reason for this warning is that const in c doesn't mean constant. It means "read only". So the value is stored at a memory address and could potentially be changed by machine code. As it is already explained in other answers, const in C merely means that a variable is read-only. It is still a run-time value. However, you can use an enum as a real constant in C:. Imho this is a flaw in many c compilers. I know for a fact that the compilers i worked with do not store a "static const"variable at an adress but replace the use in the code by the very constant.

This can be verified as you will get the same checksum for the produced code when you use a preprocessors define directive and when you use a static const variable. Either way you should use static const variables instead of defines whenever possible as the static const is type safe. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Variably modified array at file scope Ask Question.

Asked 12 years, 2 months ago. Active 5 years, 1 month ago. Viewed k times. However, when I do this, I get the error "Variably modified 'types' at file scope" I gather that this may have something to do with the array size being a variable I don't get this message when I put an integer literal there, like static int types[4].

I want to fix this, but maybe I am going about it all wrong Asked 7 years, 11 months ago. Active 7 years, 11 months ago. Viewed 7k times. Improve this question. Add a comment. Active Oldest Votes. In code 2, your array of structs resides in data segment which is by definition A data segment is a portion of virtual address space of a program, which contains the global variables and static variables that are initialized by the programmer. Improve this answer. Dabo Dabo 2, 2 2 gold badges 16 16 silver badges 25 25 bronze badges.

Soumen Soumen 1, 12 12 silver badges 17 17 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Active 1 year, 1 month ago. Viewed k times. Improve this question. Mike Possible duplicate of Variably modified array at file scope — tstew. Add a comment.

Active Oldest Votes. You can not have static array which size is given as a variable That's why constants should be define d: define a 6 This way preprocessor will replace a with 6 , making it valid declaration. Improve this answer.

No, this will still be a variable. Use define. Simple answer variable modified array at file scope is not possible. Detailed : make it compile time integral constant expression , since array length must be specified at the compile time.

If you remove static and provide initialization then it will generate error as above. But if you keep static as well as initialization the still will be error. But if you remove initialization and keep static the below error will come.

Omkant Omkant 8, 7 7 gold badges 36 36 silver badges 58 58 bronze badges. C99 doesn't support VLA's at file-scope either. Its a stack-thing.