Generic ELF target group signature symbol

Even though the generic ELF target doesn't handle groups correctly,
this helps avoid a segfault in bfd_elf_set_group_contents seen on
d30v-elf, dlx-elf, pj-elf, and xgate-elf when linking the pr22836
testcase.

	PR 24596
bfd/
	* linker.c (_bfd_generic_link_output_symbols): Heed BSF_KEEP.
ld/
	* emultempl/genelf.em (gld${EMULATION_NAME}_after_open): Set
	BFS_KEEP on group signature symbol.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index a7603da..3f7f174 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,8 @@
+2019-05-27  Alan Modra  <amodra@gmail.com>
+
+       PR 24596
+       * linker.c (_bfd_generic_link_output_symbols): Heed BSF_KEEP.
+
 2019-05-24  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
        * elfnn-aarch64.c (elfNN_aarch64_merge_symbol_attribute): New function.

diff --git a/bfd/linker.c b/bfd/linker.c
index 9e89c84..1b71fcf 100644 (file)
--- a/bfd/linker.c
+++ b/bfd/linker.c
@@ -2112,12 +2112,11 @@ _bfd_generic_link_output_symbols (bfd *output_bfd,
            }
        }
 
-      /* This switch is straight from the old code in
-        write_file_locals in ldsym.c.  */
-      if (info->strip == strip_all
-         || (info->strip == strip_some
-             && bfd_hash_lookup (info->keep_hash, bfd_asymbol_name (sym),
-                                 FALSE, FALSE) == NULL))
+      if ((sym->flags & BSF_KEEP) == 0
+         && (info->strip == strip_all
+             || (info->strip == strip_some
+                 && bfd_hash_lookup (info->keep_hash, bfd_asymbol_name (sym),
+                                     FALSE, FALSE) == NULL)))
        output = FALSE;
       else if ((sym->flags & (BSF_GLOBAL | BSF_WEAK | BSF_GNU_UNIQUE)) != 0)
        {
@@ -2131,6 +2130,8 @@ _bfd_generic_link_output_symbols (bfd *output_bfd,
          else
            output = FALSE;
        }
+      else if ((sym->flags & BSF_KEEP) != 0)
+       output = TRUE;
       else if (bfd_is_ind_section (sym->section))
        output = FALSE;
       else if ((sym->flags & BSF_DEBUGGING) != 0)

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 4de04b6..36d866f 100644 (file)
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,9 @@
+2019-05-27  Alan Modra  <amodra@gmail.com>
+
+       PR 24596
+       * emultempl/genelf.em (gld${EMULATION_NAME}_after_open): Set
+       BFS_KEEP on group signature symbol.
+
 2019-04-24  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
        * testsuite/ld-aarch64/aarch64-elf.exp: Add new tests.

diff --git a/ld/emultempl/genelf.em b/ld/emultempl/genelf.em
index 472f701..664a5b1 100644 (file)
--- a/ld/emultempl/genelf.em
+++ b/ld/emultempl/genelf.em
@@ -45,7 +45,9 @@ gld${EMULATION_NAME}_after_open (void)
          if ((sec->flags & (SEC_GROUP | SEC_LINKER_CREATED)) == SEC_GROUP)
            {
              struct bfd_elf_section_data *sec_data = elf_section_data (sec);
-             elf_group_id (sec) = syms[sec_data->this_hdr.sh_info - 1];
+             struct bfd_symbol *sym = syms[sec_data->this_hdr.sh_info - 1];
+             elf_group_id (sec) = sym;
+             sym->flags |= BSF_KEEP;
            }
 }