about some directives used in c
 

in source code about glibc-2.3.3, there are so many
directives used. i don't know what is the exactly means.
i list them below:

weak_alias
strong_alias
stub_warning

and, where to find the manual about them?

thx

Probably glibc-internal stuff. The user of glibc shouldn't need nor use them. So no man page is probably a Good Thing.