[Bug tools/21332] elflint doesn't handle compressed sections

[rguenther at suse dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=21332

--- Comment #4 from rguenther at suse dot de ---
On Thu, 30 Mar 2017, mark at klomp dot org wrote:

> https://sourceware.org/bugzilla/show_bug.cgi?id=21332
> 
> --- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
> (In reply to rguenther from comment #2)
> > On Thu, 30 Mar 2017, mark at klomp dot org wrote:
> > > The question is how did a compressed ELF section end up in the elfstrmerge.o
> > > file in the first place? Especially since it apparently isn't in the resulting
> > > EXE file. Seems somehow the ET_REL file got created with a compressed ELF
> > > section, but then the linker fixed things up again?
> > 
> > Recent GAS versions compress debug sections by default (but ld then
> > uncompresses again for the final exe).  Supposedly to improve I/O.
> 
> That seems like a stupid default. Were there any benchmarks showing the extra
> compressing/decompressing cycle actually help? I am sure eu-elflint isn't the
> only program that cannot handle compressed ELF sections by default.

The idea is that exposing this only (by default) for .o files the set
of tools would be small.  -Wa,--nocompress-debug-sections disables this.

As of binutils 2.27 we have

* Default to --enable-compressed-debug-sections=gas for Linux/x86 targets.

so quite narrow list of targets (not sure how s390x is affected for me
then...).

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