bfd: fix -std=gnu23 compatibility wrt _Bool

GCC trunk now defaults to -std=gnu23. We return false in a few places
which can't work when true/false are a proper type (_Bool). Return NULL
where appropriate instead of false. All callers handle this appropriately.

ChangeLog:
	PR ld/32372

	* elf32-ppc.c (ppc_elf_tls_setup): Return NULL.
        * elf32-xtensa.c (translate_reloc_bfd_fix): Ditto.
        (translate_reloc): Ditto.
        * elf64-ppc.c (update_local_sym_info): Ditto.
        * mach-o.c (bfd_mach_o_lookup_uuid_command): Ditto.
        * xsym.c (bfd_sym_read_name_table): Ditto.

(cherry picked from commit 931e4f9b09512bb9012204bb2e4060ab6d9b9b46)

5 files changed, 6 insertions, 6 deletions

diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index a5370a0..8c89ae1 100644
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -4352,7 +4352,7 @@ ppc_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
 		      _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
 					      opt->dynstr_index);
 		      if (!bfd_elf_link_record_dynamic_symbol (info, opt))
-			return false;
+			return NULL;
 		    }
 		  htab->tls_get_addr = opt;
 		}
diff --git a/bfd/elf32-xtensa.c b/bfd/elf32-xtensa.c
index eb7fef9..58f79e5 100644
--- a/bfd/elf32-xtensa.c
+++ b/bfd/elf32-xtensa.c
@@ -10070,7 +10070,7 @@ translate_reloc_bfd_fix (reloc_bfd_fix *fix)
      location.  Otherwise, the relocation should move within the
      section.  */
 
-  removed = false;
+  removed = NULL;
   if (is_operand_relocation (fix->src_type))
     {
       /* Check if the original relocation is against a literal being
@@ -10141,7 +10141,7 @@ translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel, asection *sec)
 
   target_offset = orig_rel->target_offset;
 
-  removed = false;
+  removed = NULL;
   if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info)))
     {
       /* Check if the original relocation is against a literal being
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index cd3aaac..9674fcd 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -4664,7 +4664,7 @@ update_local_sym_info (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
 	  size_t amt = sizeof (*ent);
 	  ent = bfd_alloc (abfd, amt);
 	  if (ent == NULL)
-	    return false;
+	    return NULL;
 	  ent->next = local_got_ents[r_symndx];
 	  ent->addend = r_addend;
 	  ent->owner = abfd;
diff --git a/bfd/mach-o.c b/bfd/mach-o.c
index 93224aa..974747c 100644
--- a/bfd/mach-o.c
+++ b/bfd/mach-o.c
@@ -6037,7 +6037,7 @@ bfd_mach_o_lookup_uuid_command (bfd *abfd)
   bfd_mach_o_load_command *uuid_cmd = NULL;
   int ncmd = bfd_mach_o_lookup_command (abfd, BFD_MACH_O_LC_UUID, &uuid_cmd);
   if (ncmd != 1 || uuid_cmd == NULL)
-    return false;
+    return NULL;
   return &uuid_cmd->command.uuid;
 }
 
diff --git a/bfd/xsym.c b/bfd/xsym.c
index 070ba4a..fe14acc 100644
--- a/bfd/xsym.c
+++ b/bfd/xsym.c
@@ -130,7 +130,7 @@ bfd_sym_read_name_table (bfd *abfd, bfd_sym_header_block *dshb)
   size_t table_offset = dshb->dshb_nte.dti_first_page * dshb->dshb_page_size;
 
   if (bfd_seek (abfd, table_offset, SEEK_SET) != 0)
-    return false;
+    return NULL;
   return _bfd_alloc_and_read (abfd, table_size, table_size);
 }