how set break point for cpp header file

liang tang via Gdb <[email protected]>
Newsgroups gmane.comp.gdb.devel
Message-ID <CAOhZW=77Rszvse0ryqf3S9GHdj=mYhoJhtnWO0+XxfUB18syxQ@mail.gmail.com> 
Hi,
I want to set break point for cpp header files. But 'info sources' doesn't
show the header file I want to debug.
What can I do to debug the header file for CPP? and If 'info sources'
doesn't contain the header file, What can I do to make the header file
contained?
Thanks. Regards
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