qt-everywhere-src-5.15.1/qtbase/mkspecs/features/use_c_linker.prf

!isEmpty(QMAKE_LINK_C):QMAKE_LINK = $$QMAKE_LINK_C
!isEmpty(QMAKE_LINK_C_SHLIB) {
    !isEmpty(QMAKE_LINK_SHLIB_CMD):QMAKE_LINK_SHLIB_CMD ~= s/^$$re_escape($$QMAKE_LINK_SHLIB)$/$$QMAKE_LINK_C_SHLIB/
    QMAKE_LINK_SHLIB = $$QMAKE_LINK_C_SHLIB
}