[Bug ld/20528] ld -r doesn't handle SHF_EXCLUDE section properly

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20528

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
This works:

diff --git a/ld/emultempl/elf32.em b/ld/emultempl/elf32.em
index dd4d35a..6ce4e00 100644
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@@ -1903,9 +1903,16 @@ gld${EMULATION_NAME}_place_orphan (asection *s,
      lang_insert_orphan to create a new output section.  */
   constraint = SPECIAL;

+  /* SEC_EXCLUDE is ignored when doing a relocatable link.  But
+     we can't merge 2 input sections with the same name when only
+     one of them has SHF_EXCLUDE.  */
   if (os->bfd_section != NULL
       && (os->bfd_section->flags == 0
-     || (((s->flags ^ os->bfd_section->flags)
+     || ((!bfd_link_relocatable (&link_info)
+          || (((elf_section_flags (s)
+          ^ elf_section_flags (os->bfd_section))
+         & SHF_EXCLUDE) == 0))
+         && ((s->flags ^ os->bfd_section->flags)
           & (SEC_LOAD | SEC_ALLOC)) == 0
          && _bfd_elf_match_sections_by_type (link_info.output_bfd,
                     os->bfd_section,

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