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Handle -z unique/-z nounique in ld

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Add (or suppress) a DT_GNU_FLAGS_1 dynamic section
with a bit flag value of DF_GNU_1_UNIQUE.

bfd/
	* elflink.c (bfd_elf_size_dynamic_sections): Call
	_bfd_elf_add_dynamic_entry to add a DT_GNU_FLAGS_1 section.
include/
	* bfdlink.h (struct bfd_link_info): New field gnu_flags_1.
ld/
	* emultempl/elf.em (gld${EMULATION_NAME}_handle_option):
	Parse -z unique / -z nounique options.
This commit is contained in:
Vivek Das Mohapatra 2020-12-14 17:25:51 +00:00 committed by Alan Modra
parent ee0688c233
commit 6a0a0dd0cc
6 changed files with 22 additions and 1 deletions
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5
bfd/ChangeLog
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@ -1,3 +1,8 @@
2020-12-15 Vivek Das Mohapatra <vivek@collabora.com>
* elflink.c (bfd_elf_size_dynamic_sections): Call
_bfd_elf_add_dynamic_entry to add a DT_GNU_FLAGS_1 section.
2020-12-14 Alan Modra <amodra@gmail.com>
* elf-bfd.h (struct elf_obj_tdata): Add being_created.

5
bfd/elflink.c
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@ -7178,7 +7178,10 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
|| !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
|| !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
|| !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
bed->s->sizeof_sym))
bed->s->sizeof_sym)
|| (info->gnu_flags_1
&& !_bfd_elf_add_dynamic_entry (info, DT_GNU_FLAGS_1,
info->gnu_flags_1)))
return FALSE;
}
}

1
include/ChangeLog
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@ -1,6 +1,7 @@
2020-12-15 Vivek Das Mohapatra <vivek@collabora.com>
* elf/common.h (DT_GNU_FLAGS_1, DF_GNU_1_UNIQUE): Define.
* bfdlink.h (struct bfd_link_info): New field gnu_flags_1.
2020-12-11 Cary Coutant <ccoutant@gmail.com>

3
include/bfdlink.h
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@ -655,6 +655,9 @@ struct bfd_link_info
/* May be used to set DT_FLAGS_1 for ELF. */
bfd_vma flags_1;
/* May be used to set DT_GNU_FLAGS_1 for ELF. */
bfd_vma gnu_flags_1;
/* May be used to set ELF visibility for __start_* / __stop_. */
unsigned int start_stop_visibility;

5
ld/ChangeLog
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@ -1,3 +1,8 @@
2020-12-15 Vivek Das Mohapatra <vivek@collabora.com>
* emultempl/elf.em (gld${EMULATION_NAME}_handle_option):
Parse -z unique / -z nounique options.
2020-12-14 Howard Chu <hyc@symas.com>
* libdep_plugin.c: New file: Processes archives that contain a

4
ld/emultempl/elf.em
View File

@ -809,6 +809,10 @@ fragment <<EOF
link_info.flags |= (bfd_vma) DF_ORIGIN;
link_info.flags_1 |= (bfd_vma) DF_1_ORIGIN;
}
else if (strcmp (optarg, "unique") == 0)
link_info.gnu_flags_1 |= (bfd_vma) DF_GNU_1_UNIQUE;
else if (strcmp (optarg, "nounique") == 0)
link_info.gnu_flags_1 &= ~(bfd_vma) DF_GNU_1_UNIQUE;
else if (strcmp (optarg, "combreloc") == 0)
link_info.combreloc = TRUE;
else if (strcmp (optarg, "nocombreloc") == 0)