[Issue 22750] New: dmd -i: undefined symbol error using templates defined in .di file

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22750

          Issue ID: 22750
           Summary: dmd -i: undefined symbol error using templates defined
                    in .di file
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: duser at airmail.cc

// dimodule.di
void fn()() { return; }

// main.d
import dimodule;
void main() { fn(); }

this works with "dmd main.d", but "dmd -i main.d" gives an undefined symbol
error for the template function

tested with versions: dmd v2.098.1 and current git master (commit
cbd0b47e0fa264b1310d302447e2dabb64e4e7ee)

the importC builtin functions in __builtins.di can't be used with dmd -i
because of this:

// main.c
// undefined symbol error with "dmd -i main.c" but works with "dmd main.c"
int main() { double x = __builtin_inf(); }

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