This is only a very slight improvement, but adding the link at least tells people where to find more info.
OK for trunk?
commit def4749f46383ee16eacedcc2e7d42cc1ce71788 Author: Jonathan Wakely <jwak...@redhat.com> Date: Wed Apr 24 00:38:18 2019 +0100 Add brief explanation of the unwind library diff --git a/gcc/doc/libgcc.texi b/gcc/doc/libgcc.texi index bf0ca9ccdab..7464110b6ee 100644 --- a/gcc/doc/libgcc.texi +++ b/gcc/doc/libgcc.texi @@ -2222,7 +2222,10 @@ with saturation. @node Exception handling routines @section Language-independent routines for exception handling -document me! +These functions form GCC's implementation of the Unwind Library interface, +as described by @uref{https://itanium-cxx-abi.github.io/cxx-abi/abi-eh.html}. + +FIXME: document these functions. @smallexample _Unwind_DeleteException