[musl] Re: [QUESTION] Which fnmatch() functionality does elfutils depend on?
Mon Oct 26 22:32:23 GMT 2020
On Mon, 2020-10-26 at 13:54 -0400, Max Rees via Elfutils-devel wrote:
> On Mon Oct 26 01:28 PM, Érico Nogueira wrote:
> > On Mon Oct 26, 2020 at 3:10 PM -03, Mark Wielaard wrote:
> > > On Mon, 2020-10-26 at 12:03 -0300, Érico Nogueira via Elfutils-
> > > devel
> > > wrote:
> > > > Do elfutils program actually depend on the extra functionality
> > > > enabled by
> > > > FNM_EXTMATCH? Is changing the flag to have no effect a "bug"?
> > >
> > > Yes. The extended wildcard pattern is relied upon by both
> > > eu-strip with
> > >
> > > --keep-section=SECTION Keep the named section. SECTION is an
> > > extended wildcard pattern. May be given
> > > more than once.
> > >
> > > and eu-elfcompress with
> > >
> > > -n, --name=SECTION SECTION name to (de)compress, SECTION is an
> > > extended wildcard pattern (defaults to
> > > '.?(z)debug*')
> > >
> > > In the eu-strip case it might be reasoned that instead of a
> > > wildcard pattern the user might most of the time simply provide
> > > a section name as is (especially since the option may be given
> > > multiple times). But in the case of eu-elfcompress the
> > > program relies on the default SECTION name being an extended
> > > wildcard pattern. So not supporting FNM_EXTMATCH breaks the
> > > default functionality of eu-elfcompress.
> > Understood, thank you. I'm replying to the musl mailing list as well,
> > then, to hopefully gather more opinions, since I don't know what the
> > best way of solving this would be.
> When I was working on porting elfutils to Adélie (kind of on the
> backburner right now) I noticed this problem as well. Rather than try to
> add FNM_EXTMATCH support to musl, I worked around it in elfutils in this
> 1. I changed the default like so:
> - add_pattern (".?(z)debug*");
> + add_pattern (".debug*");
> + add_pattern (".zdebug*");
> 2. I updated the corresponding help text to mention this new default.
> The user could do something similar themselves with multiple "-n"
That is a workaround to get a working build if your libc currently
doesn't provide a working fnmatch with FNM_EXTMATCH. But it would still
break the interface of the tools that currently accept an extended
wildcard pattern. So I think the best way forward is adding
FNM_EXTMATCH support to those libcs that don't support it yet (and
maybe get it standardized).
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