how to auto load a dynamic library

hi, every body. i have in trouble that how to load a dynamic library by hand.
for example, i know how to generate a dynamic library and how to link a dynamic library in makefile.
generate a dynamic library:
add -dy -G behind cc
link a dynamic library in makefile:
add -dy -Bdynamic behind cc
but how to add a dynamic library in exe file,i don't know

please help me . thank you

subrain