How to get glibc's debug symbol available?

[refugee]

When I debug a program whose bug occurs in the glibc's pthread_barrier_XXX, I want to use gdb to step into the glibc. However there is no debug package of glibc on gentoo, but other distributions such as debian have. So I get the question of the title, can anybody help me?

[Hu]

There is nothing special about sys-libs/glibc with regard to debug information. Like any other package, you must instruct Portage to retain its debug symbols if you want to have them around for later. The technique for this is explained in How to get meaningful backtraces in Gentoo.

[refugee]

thank you very much, I'll take a look at it.