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[Bug ld/21382] --as-needed cannot be combined with -flto
From: |
cvs-commit at gcc dot gnu.org |
Subject: |
[Bug ld/21382] --as-needed cannot be combined with -flto |
Date: |
Wed, 27 Sep 2017 09:57:10 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=21382
--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot
gnu.org> ---
The binutils-2_28-branch branch has been updated by Alan Modra
<address@hidden>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b805037cf0061e86b1a71cba26fdaff52a46844d
commit b805037cf0061e86b1a71cba26fdaff52a46844d
Author: H.J. Lu <address@hidden>
Date: Thu Apr 20 07:48:24 2017 -0700
Handle symbol defined in IR and referenced in DSO
We need to make an IR symbol visible if it is defined in an IR object
and referenced in a dynamic object. When --as-needed is used, since
linker removes the IR symbol reference of the dynamic object if the
dynamic object isn't needed in the first pass, the IR definition isn't
visible to the dynamic object even if the dynamic object becomes needed
in the second pass. Add dynamic_ref_after_ir_def to bfd_link_hash_entry
to track IR symbol which is defined in an IR object and later referenced
in a dynamic object. dynamic_ref_after_ir_def is preserved when restoring
the symbol table for unneeded dynamic object.
bfd/
PR ld/21382
* elflink.c (elf_link_add_object_symbols): Preserve
dynamic_ref_after_ir_def when restoring the symbol table for
unneeded dynamic object.
include/
PR ld/21382
* bfdlink.h (bfd_link_hash_entry): Add dynamic_ref_after_ir_def.
ld/
PR ld/21382
* plugin.c (is_visible_from_outside): Symbol may be visible
from outside if dynamic_ref_after_ir_def is set.
(plugin_notice): Set dynamic_ref_after_ir_def if the symbol is
defined in an IR object and referenced in a dynamic object.
* testsuite/ld-plugin/lto.exp: Run PR ld/21382 tests.
* testsuite/ld-plugin/pr21382a.c: New file.
* testsuite/ld-plugin/pr21382b.c: Likewise.
(cherry picked from commit 59fa66c53823dc695f78669f40ec2eebab3aec42)
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