link-referenced-from-main-function-ptr.c.ref

link-referenced-from-main-function-ptr.c:1:1: error: No definition for symbol with external linkage: f.

    Undefined behavior (UB-TDR2):
        see C11 section 6.9:5 http://rvdoc.org/C11/6.9
        see C11 section J.2:1 item 84 http://rvdoc.org/C11/J.2
        see CERT-C section MSC15-C http://rvdoc.org/CERT-C/MSC15-C
        see MISRA-C section 8.1:3 http://rvdoc.org/MISRA-C/8.1

Translation failed (kcc_config dumped). To repeat, run this command in directory unit-fail-compilation: