Re: [gentoo-dev] [RFC] New global USE flag: unwind

[Mart Raudsepp]

Ühel kenal päeval, N, 11.05.2017 kell 11:29, kirjutas Chí-Thanh
Christopher Nguyễn:
> Suggested description: Add support for stack traces and function
> name 
> resolution via sys-libs/libunwind
>
> That description is a little unwieldy though, better suggestions are 
> welcome.

I think it's usually used to be able to grab function names and such
for crash backtraces or whatnot into logs, even if the binaries are
rather optimized?

> Currently in use by the following packages:
>
> dev-cpp/glog:unwind - Use sys-libs/libunwind for stack unwinding
> instead 
> of glibc/gcc (may be more reliable on x86_64)
> dev-libs/efl:unwind - Enable debug support via sys-libs/libunwind
> dev-libs/weston:unwind - Enable libunwind usage for backtraces
> dev-util/ltrace:unwind - Use sys-libs/libunwind for frame unwinding
> support
> dev-util/perf:unwind - Use sys-libs/libunwind for frame unwinding
> support.
> dev-util/strace:unwind - Enable stack backtraces (-k flag) via 
> sys-libs/libunwind
> media-libs/gstreamer:unwind - Enable sys-libs/libunwind usage for
> better 
> backtrace support in leaks tracer module
> www-apache/mod_backtrace:unwind - Use sys-libs/libunwind to provide 
> better resolution of function names.
> x11-apps/intel-gpu-tools:unwind - Provide automatic stack traces on
> test 
> failures
> x11-base/xorg-server:unwind - Enable libunwind usage for backtraces
>
> I understand that dev-cpp/glog uses the unwind flag differently from
> the 
> other packages. If that is an issue that package's flag could be
> renamed 
> to "libunwind" as sys-libs/libcxx et al. currently use.

For gstreamer 1.12 I will also need one for libdw for DWARF unwind to
avoid automagic deps. Maybe it'd be OK to control both (and so both
libraries) via USE=unwind too instead of some local USE=dwarf or
USE=libdw or USE=dw or whatnot?

Mart