Comment # 12 on bug 1180610 from Richard Biener

(In reply to Martin Li������ka from comment #11)
> (In reply to Richard Biener from comment #10)
> > So to clarify - when strip strips a section from ELF it also needs to remove
> > any symbols pointing to it since else they might end up pointing into wrong
> > sections or to sections that do not exist (out of bound section index) or to
> > places outside of the (invalid) section.
> > 
> > eu_strip gets this "right" (with limited testing of a simple exec compiled
> > with -flto and stripped with eu-strip --strip-debug), strip --strip-debug
> > as well (binutils 2.35.1).
> 
> How do you create the separate debug info ELF file? Note that the
> problematic symbol is in the separate binary:
> 
> $ gcc foo.c -O2 -g -flto -shared -o libfoo.so
> $ objcopy --only-keep-debug  libfoo.so debug.so
> $ readelf -s --wide debug.so | grep foo.c
>     60: 0000000000000067     0 NOTYPE  LOCAL  DEFAULT   25 foo.c.cf7807ca

I don't - I checked that strip --strip-debug does the correct thing.  So
there must be code to handle symbols refering to the debug.  Because
objcopy --only-keep-debug keeps the source intact.  You need an additional
step to strip libfoo.so from its debug info and that's where things go
wrong it seems.

> > 
> > So sth is bogus in the course of events performing the stripping?