Handle symbol defined in IR and referenced in DSO
authorH.J. Lu <hjl.tools@gmail.com>
Thu, 20 Apr 2017 14:48:24 +0000 (07:48 -0700)
committerH.J. Lu <hjl.tools@gmail.com>
Thu, 20 Apr 2017 14:48:35 +0000 (07:48 -0700)
commit59fa66c53823dc695f78669f40ec2eebab3aec42
tree175d8e3b6761189c2a361c6cfdb4dce606d10c38
parentc76886885987e543f9162809ad86a0a37b394e82
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.
bfd/ChangeLog
bfd/elflink.c
include/ChangeLog
include/bfdlink.h
ld/ChangeLog
ld/plugin.c
ld/testsuite/ld-plugin/lto.exp
ld/testsuite/ld-plugin/pr21382a.c [new file with mode: 0644]
ld/testsuite/ld-plugin/pr21382b.c [new file with mode: 0644]