[Bug ld/21557] __start_SCN not provided if SCN used in linker script

[amonakov at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21557

--- Comment #4 from Alexander Monakov <amonakov at gmail dot com> ---
> Please open a new bug report.

Done, bug 21562.

Now I see that to use __start_SCN together with linker scripts and
--gc-sections, one should put the PROVIDE statement inside of the output
section declaration:

SECTIONS {
        scnfoo : {
        PROVIDE_HIDDEN(__start_scnfoo = .);
        *(scnfoo)
        }
}

This looks logical and seems to work with -gc-sections, with both ld.bfd and
Gold. I think the Glibc approach quoted in comment #0 with PROVIDE statements
outside of output groups sets a bad example (and breaks build with
--gc-sections).

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