Consider the following example:
#include <stdio.h>
#include <stdint.h>
struct mystruct_s {
uint16_t first;
};
typedef struct mystruct_s mystruct_t;
#define THEVALUE 5
const mystruct_t mytester = {
.first = THEVALUE,
};
struct otherstruct_s {
uint16_t initial;
};
typedef struct otherstruct_s otherstruct_t;
otherstruct_t othertester = {
.initial = mytester.first,
};
int main() {
printf("Hello, world %d!\n", othertester.initial);
return 0;
}
When I build this in https://replit.com/languages/c I get:
> clang-7 -pthread -lm -o main main.c
main.c:20:23: error: initializer element is not a
compile-time constant
.initial = mytester.first,
~~~~~~~~~^~~~~
1 error generated.
exit status 1
I was kind of hoping, that since mytester is declared const, and its its .first field is initialized through a define, the compiler would have figured out that I want the same initialization applied to othertester.initial, but apparently not.
In my actual code, gcc was highlighting mytester, while here clang did in fact point to the field by highlighting, which indeed is not const - is this why I cannot initialize in this case?
Anyways, I have a similar (though much more convoluted) actual case; and while I'm aware that I can just use the define to initialize, I would really like to instead initialize via mytester.first for readability. Is there any workaround where I can use that, without having to define a copy of mystruct_s where the .first field is const?
