ld: Mention --enable-textrel-check=yes is default for Linux/x86 targets

[deliverable/binutils-gdb.git] / ld / ldelf.c

diff --git a/ld/ldelf.c b/ld/ldelf.c
index 19ec9085e6f0b968eb8bc1dcb83125308389aeb2..efb4b77382e483cb19d1d6a03074698a32615cd4 100644 (file)
--- a/ld/ldelf.c
+++ b/ld/ldelf.c
@@ -1,5 +1,5 @@
 /* ELF emulation code for targets using elf.em.
-   Copyright (C) 1991-2019 Free Software Foundation, Inc.
+   Copyright (C) 1991-2020 Free Software Foundation, Inc.
 
    This file is part of the GNU Binutils.
 
@@ -375,6 +375,9 @@ ldelf_try_needed (struct dt_needed *needed, int force, int is_linux)
 
   bfd_elf_set_dyn_lib_class (abfd, (enum dynamic_lib_link_class) link_class);
 
+  *link_info.input_bfds_tail = abfd;
+  link_info.input_bfds_tail = &abfd->link.next;
+
   /* Add this file into the symbol table.  */
   if (! bfd_link_add_symbols (abfd, &link_info))
     einfo (_("%F%P: %pB: error adding symbols: %E\n"), abfd);
@@ -780,8 +783,7 @@ ldelf_parse_ld_so_conf_include (struct ldelf_ld_so_conf *info,
   ldelf_parse_ld_so_conf (info, pattern);
 #endif
 
-  if (newp)
-    free (newp);
+  free (newp);
 }
 
 static bfd_boolean
@@ -894,7 +896,7 @@ ldelf_parse_ld_so_conf (struct ldelf_ld_so_conf *info, const char *filename)
 
 static bfd_boolean
 ldelf_check_ld_so_conf (const struct bfd_link_needed_list *l, int force,
-                       int elfsize)
+                       int elfsize, const char *prefix)
 {
   static bfd_boolean initialized;
   static const char *ld_so_conf;
@@ -907,7 +909,7 @@ ldelf_check_ld_so_conf (const struct bfd_link_needed_list *l, int force,
 
       info.path = NULL;
       info.len = info.alloc = 0;
-      tmppath = concat (ld_sysroot, "${prefix}/etc/ld.so.conf",
+      tmppath = concat (ld_sysroot, prefix, "/etc/ld.so.conf",
                        (const char *) NULL);
       if (!ldelf_parse_ld_so_conf (&info, tmppath))
        {
@@ -986,12 +988,13 @@ ldelf_check_needed (lang_input_statement_type *s)
 
 void
 ldelf_after_open (int use_libpath, int native, int is_linux, int is_freebsd,
-                 int elfsize)
+                 int elfsize, const char *prefix)
 {
   struct bfd_link_needed_list *needed, *l;
   struct elf_link_hash_table *htab;
   asection *s;
   bfd *abfd;
+  bfd **save_input_bfd_tail;
 
   after_open_default ();
 
@@ -1134,6 +1137,7 @@ ldelf_after_open (int use_libpath, int native, int is_linux, int is_freebsd,
      special action by the person doing the link.  Note that the
      needed list can actually grow while we are stepping through this
      loop.  */
+  save_input_bfd_tail = link_info.input_bfds_tail;
   needed = bfd_elf_get_needed_list (link_info.output_bfd, &link_info);
   for (l = needed; l != NULL; l = l->next)
     {
@@ -1260,7 +1264,7 @@ ldelf_after_open (int use_libpath, int native, int is_linux, int is_freebsd,
                break;
 
              if (is_linux
-                 && ldelf_check_ld_so_conf (l, force, elfsize))
+                 && ldelf_check_ld_so_conf (l, force, elfsize, prefix))
                break;
            }
 
@@ -1290,6 +1294,20 @@ ldelf_after_open (int use_libpath, int native, int is_linux, int is_freebsd,
             l->name, l->by);
     }
 
+  for (abfd = link_info.input_bfds; abfd; abfd = abfd->link.next)
+    if (bfd_get_format (abfd) == bfd_object
+       && ((abfd->flags) & DYNAMIC) != 0
+       && bfd_get_flavour (abfd) == bfd_target_elf_flavour
+       && (elf_dyn_lib_class (abfd) & (DYN_AS_NEEDED | DYN_NO_NEEDED)) == 0
+       && elf_dt_name (abfd) != NULL)
+      {
+       if (bfd_elf_add_dt_needed_tag (abfd, &link_info) < 0)
+         einfo (_("%F%P: failed to add DT_NEEDED dynamic tag\n"));
+      }
+
+  link_info.input_bfds_tail = save_input_bfd_tail;
+  *save_input_bfd_tail = NULL;
+
   if (link_info.eh_frame_hdr_type == COMPACT_EH_HDR)
     if (!bfd_elf_parse_eh_frame_entries (NULL, &link_info))
       einfo (_("%F%P: failed to parse EH frame entries\n"));
@@ -1846,13 +1864,13 @@ elf_orphan_compatible (asection *in, asection *out)
   if (elf_section_data (out)->this_hdr.sh_info
       != elf_section_data (in)->this_hdr.sh_info)
     return FALSE;
-  /* We can't merge with member of output section group nor merge two
-     sections with differing SHF_EXCLUDE when doing a relocatable link.
-   */
+  /* We can't merge with a member of an output section group or merge
+     two sections with differing SHF_EXCLUDE or other processor and OS
+     specific flags when doing a relocatable link.  */
   if (bfd_link_relocatable (&link_info)
       && (elf_next_in_group (out) != NULL
          || ((elf_section_flags (out) ^ elf_section_flags (in))
-             & SHF_EXCLUDE) != 0))
+             & (SHF_MASKPROC | SHF_MASKOS)) != 0))
     return FALSE;
   return _bfd_elf_match_sections_by_type (link_info.output_bfd, out,
                                          in->owner, in);
@@ -2134,3 +2152,32 @@ ldelf_place_orphan (asection *s, const char *secname, int constraint)
 
   return lang_insert_orphan (s, secname, constraint, after, place, NULL, NULL);
 }
+
+void
+ldelf_before_place_orphans (void)
+{
+  bfd *abfd;
+
+  for (abfd = link_info.input_bfds;
+       abfd != (bfd *) NULL; abfd = abfd->link.next)
+    if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
+       && bfd_count_sections (abfd) != 0
+       && !bfd_input_just_syms (abfd))
+      {
+       asection *isec;
+       for (isec = abfd->sections; isec != NULL; isec = isec->next)
+         {
+           /* Discard a section if any of its linked-to section has
+              been discarded.  */
+           asection *linked_to_sec;
+           for (linked_to_sec = elf_linked_to_section (isec);
+                linked_to_sec != NULL;
+                linked_to_sec = elf_linked_to_section (linked_to_sec))
+             if (discarded_section (linked_to_sec))
+               {
+                 isec->output_section = bfd_abs_section_ptr;
+                 break;
+               }
+         }
+      }
+}