[Issue 22884] New: ImportC: error when casting between function pointers for statically initialized variables

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22884

          Issue ID: 22884
           Summary: ImportC: error when casting between function pointers
                    for statically initialized variables
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Keywords: ImportC, rejects-valid
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dave287091 at gmail.com

The following C code fails to compile. This kind of pointer cast can be seen in
sqlite and also in some C library APIs like python.


int printf(const char*, ...);
typedef void (*funcptr)(void);

funcptr a = printf; // ok
funcptr b = (funcptr)printf; // Error: non-constant expression `printf`

funcptr foo(void){
    funcptr f = (funcptr)printf; // ok
    return f;
}

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