From: "H.J. Lu" <hjl.tools@gmail.com>
To: Alan Modra <amodra@gmail.com>
Cc: Binutils <binutils@sourceware.org>
Subject: [PATCH] ld: Add PR ld/25593 tests
Date: Wed, 26 Feb 2020 02:28:00 -0000 [thread overview]
Message-ID: <CAMe9rOpM6ukci40KyynjdNE-CdEH=w6ne8sg74qVMn_8ux7a=A@mail.gmail.com> (raw)
In-Reply-To: <20200226000524.GB5750@bubble.grove.modra.org>
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On Tue, Feb 25, 2020 at 4:05 PM Alan Modra <amodra@gmail.com> wrote:
>
> This patch delays setting up DT_NEEDED dynamic tags until all object
> files and libraries have been opened and their symbols processed,
> rather than adding the tags while processing symbols. Tags are
> ordered according to the position of the associated library on the
> command line and linker scripts. It is still possible with
> --as-needed libs that are mentioned more than once for tags to be
> ordered according to which mention was needed. For example with
> "--as-needed a.so b.so c.so b.so" when b.so is not needed by a.so or
> any other prior object file but is needed by c.so, the order of tags
> will be "A C B".
>
> bfd/
> PR 25593
> * elf-bfd.h (struct elf_link_hash_table): Rename "loaded" to
> "dyn_loaded".
> (bfd_elf_add_dt_needed_tag): Declare.
> * elf-strtab.c (_bfd_elf_strtab_restore): Handle NULL buf.
> * elflink.c (bfd_elf_add_dt_needed_tag): Make global and rename
> from elf_add_dt_needed_tag. Remove soname and doit param.
> (elf_link_add_object_symbols): Don't use elf_add_dt_needed_tag
> to see whether as-needed lib is already loaded, use dyn_loaded
> list instead. When saving and restoring around as-needed lib
> handle possibility that dynstr has not been initialised. Don't
> add DT_NEEDED tags here. Limit dyn_loaded list to dynamic libs.
> Mark libs loaded via DT_NEEDED entries of other libs with
> DYN_NO_NEEDED if they should not be mentioned in DT_NEEDED of
> the output.
> (elf_link_check_versioned_symbol): Remove now unneccesary
> DYNAMIC check when traversing dyn_loaded list.
> ld/
> PR 25593
> * ldelf.c (ldelf_try_needed): Add DT_NEEDED lib to input_bfds.
> (ldelf_after_open): Save state of input_bfds list before loading
> DT_NEEDED libs. Traverse input_bfds list adding DT_NEEDED tags.
> Restore input_bfds list.
> * testsuite/ld-cris/gotplt1.d: Adjust for changed .dynstr order.
>
Here is a patch to add some tests. OK for master branch.
--
H.J.
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next prev parent reply other threads:[~2020-02-26 2:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 0:05 PR25593, --as-needed breaks DT_NEEDED order with linker plugin Alan Modra
2020-02-26 2:28 ` H.J. Lu [this message]
2020-02-26 7:41 ` [PATCH] ld: Add PR ld/25593 tests Alan Modra
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