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I don't understand why LINK asking for underscore char in entry label name when it's being compiled without any import libs and doesn't care about it when it's compiled without the libs.
Example to clear my point:
without libs, yet OK(underscore char in entry name):

_SVIN segment para 'CODE'

_start:

         ret

_SVIN ends

        end _start

without libs, link problems (no underscore char in entry name):

_SVIN segment para 'CODE'

start:

         ret

_SVIN ends

        end start

with libs, with or without underscore - no problems:

includelib bla....

...

_SVIN segment para 'CODE'

start:

         call ExitProcess

_SVIN ends

        end start