bfd: xtensa: fix shrink_dynamic_reloc_sections for export-dynamic

shrink_dynamic_reloc_sections must remove PLT entry that was created for
an undefined weak symbol in the presence of --export-dynamic option when
relaxation coalesces literals pointing to that symbol. This fixes the
following assertion:

  ld: BFD (GNU Binutils) 2.31.1 internal error, aborting at
  elf32-xtensa.c:3292 in elf_xtensa_finish_dynamic_sections

2019-03-29  Max Filippov  <jcmvbkbc@gmail.com>
bfd/
	* elf32-xtensa.c (shrink_dynamic_reloc_sections): Add
	info->export_dynamic to the conditional.

ld/
	* testsuite/ld-xtensa/relax-undef-weak-pie-export-dynamic.d: New
	test definition.
	* testsuite/ld-xtensa/xtensa.exp
	(relax-undef-weak-pie-export-dynamic): Add new test.

Author: jcmvbkbc

bfd/ChangeLog

@@ -1,3 +1,8 @@
+2019-03-29  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* elf32-xtensa.c (shrink_dynamic_reloc_sections): Add
+	info->export_dynamic to the conditional.
+
 2019-03-28  Alan Modra  <amodra@gmail.com>
 
 	PR 24392

bfd/elf32-xtensa.c

@@ -10083,7 +10083,8 @@ shrink_dynamic_reloc_sections (struct bfd_link_info *info,
       && (input_section->flags & SEC_ALLOC) != 0
       && (dynamic_symbol || bfd_link_pic (info))
       && (!h || h->root.type != bfd_link_hash_undefweak
-	  || (dynamic_symbol && bfd_link_dll (info))))
+	  || (dynamic_symbol
+	      && (bfd_link_dll (info) || info->export_dynamic))))
     {
       asection *srel;
       bfd_boolean is_plt = FALSE;

ld/ChangeLog

@@ -1,3 +1,10 @@
+2019-03-29  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* testsuite/ld-xtensa/relax-undef-weak-pie-export-dynamic.d: New
+	test definition.
+	* testsuite/ld-xtensa/xtensa.exp
+	(relax-undef-weak-pie-export-dynamic): Add new test.
+
 2019-03-26  Martin Liska  <mliska@suse.cz>
 
 	* plugin.c (get_symbols): Add lto_kind_str, lto_resolution_str,

ld/testsuite/ld-xtensa/relax-undef-weak-pie-export-dynamic.d

@@ -0,0 +1,14 @@
+#source: relax-undef-weak.s
+#ld: -pie --export-dynamic
+#readelf: -r
+#...
+Relocation section '\.rela\.dyn' .* 3 .*
+#...
+.*R_XTENSA_RTLD.*
+.*R_XTENSA_RTLD.*
+.*R_XTENSA_GLOB_DAT.*fd.*
+#...
+Relocation section '\.rela\.plt' .* 1 .*
+#...
+.*R_XTENSA_JMP_SLOT.*fd.*
+#...

ld/testsuite/ld-xtensa/xtensa.exp

@@ -34,6 +34,7 @@ run_dump_test "relax-static-shared"
 run_dump_test "relax-static-local-shared"
 
 run_dump_test "relax-undef-weak-pie"
+run_dump_test "relax-undef-weak-pie-export-dynamic"
 run_dump_test "relax-undef-weak-local-pie"
 run_dump_test "relax-undef-weak-shared"
 run_dump_test "relax-undef-weak-local-shared"