https://sourceware.org/bugzilla/show_bug.cgi?id=21181
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2017-02-20
CC| |amodra at gmail dot com
Assignee|unassigned at sourceware dot org |amodra at gmail dot com
Ever confirmed|0 |1
--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
I think this was very likely triggered by my elf_backend_dtrel_excludes_plt
change, git commit 64f52338e9. Architectures other than alpha are likely to be
affected too, if you can manage to create a binary with plt dynamic relocs but
no other dynamic relocs, and DT_RELA/DT_RELASZ are emitted.
I'm guessing that all the bad -z now binaries have DT_RELASZ zero, which would
mean that the value of DT_RELA should not matter. Except that it does, due to
a glibc bug. See glibc/elf/dynamic_link.h _ELF_DYNAMIC_DO_RELOC and note what
happens during processing of DT_PLTREL with DT_RELA/DT_RELASIZ as you describe.
No PLT reloc processing for you!
It's also a bug that alpha ld emits DT_RELA/DT_RELASZ when DT_RELASZ is zero.
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