[PR ld/22269] arm: Avoid dynamic relocs for undefweak symbols in static PIE

With static PIE linking undefined weak symbols are resolved to 0, so no
dynamic relocation is needed for them. The UNDEFWEAK_NO_DYNAMIC_RELOC
macro was introduced so this case can be handled easily, but it was not
applied consistently in the first attempt to fix ld/22269 for arm:

  commit 95b03e4ad68e7a90f5096b47df595636344b783a
  arm: Check UNDEFWEAK_NO_DYNAMIC_RELOC

This patch fixes spurious relative relocs in static PIE binaries against
GOT entries created for undefined weak symbols on arm*-*, this fixes

FAIL: pr22269-1 (static pie undefined weak)

bfd/ChangeLog:

	PR ld/22269
	* elf32-arm.c (elf32_arm_final_link_relocate): Use
	UNDEFWEAK_NO_DYNAMIC_RELOC.
	(allocate_dynrelocs_for_symbol): Likewise.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 2aba654826d0025e9655e5f6521e39c8278ca4fb..00d6cd810b38fca970f7d24a091a654c95a425ce 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,10 @@
+2020-01-10  Szabolcs Nagy  <szabolcs.nagy@arm.com>
+
+       PR ld/22269
+       * elf32-arm.c (elf32_arm_final_link_relocate): Use
+       UNDEFWEAK_NO_DYNAMIC_RELOC.
+       (allocate_dynrelocs_for_symbol): Likewise.
+
 2020-01-10  Tamar Christina  <tamar.christina@arm.com>
 
        PR 25210

diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 2bf355a331222bc3c2d1c54ee704cfddbd11443f..faf8376f2006f9c8f8da977fd5341741af84ecd5 100644 (file)
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -11578,8 +11578,7 @@ elf32_arm_final_link_relocate (reloc_howto_type *           howto,
                  if (dynreloc_st_type == STT_GNU_IFUNC)
                    outrel.r_info = ELF32_R_INFO (0, R_ARM_IRELATIVE);
                  else if (bfd_link_pic (info)
-                          && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
-                              || h->root.type != bfd_link_hash_undefweak))
+                          && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
                    outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE);
                  else
                    {
@@ -16452,8 +16451,7 @@ allocate_dynrelocs_for_symbol (struct elf_link_hash_entry *h, void * inf)
               GOT entry's R_ARM_IRELATIVE relocation.  */
            elf32_arm_allocate_irelocs (info, htab->root.srelgot, 1);
          else if (bfd_link_pic (info)
-                  && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
-                      || h->root.type != bfd_link_hash_undefweak))
+                  && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h))
            /* Reserve room for the GOT entry's R_ARM_RELATIVE relocation.  */
            elf32_arm_allocate_dynrelocs (info, htab->root.srelgot, 1);
          else if (htab->fdpic_p && tls_type == GOT_NORMAL)