Don't add DT_NEEDED for unmatched symbol

Don't add DT_NEEDED if a symbol from a library loaded via DT_NEEDED
doesn't match the symbol referenced by regular object.

bfd/

	PR ld/19553
	* elflink.c (elf_link_add_object_symbols): Don't add DT_NEEDED
	if a symbol from a library loaded via DT_NEEDED doesn't match
	the symbol referenced by regular object.

ld/testsuite/

	PR ld/19553
	* testsuite/ld-elf/indirect.exp: Run tests for PR ld/19553.
	* testsuite/ld-elf/pr19553.map: New file.
	* testsuite/ld-elf/pr19553.map: Likewise.
	* testsuite/ld-elf/pr19553a.c: Likewise.
	* testsuite/ld-elf/pr19553b.c: Likewise.
	* testsuite/ld-elf/pr19553b.out: Likewise.
	* testsuite/ld-elf/pr19553c.c: Likewise.
	* testsuite/ld-elf/pr19553c.out: Likewise.
	* testsuite/ld-elf/pr19553d.c: Likewise.
	* testsuite/ld-elf/pr19553d.out: Likewise.

bfd/ChangeLog

@@ -1,3 +1,10 @@
+2016-02-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/19553
+	* elflink.c (elf_link_add_object_symbols): Don't add DT_NEEDED
+	if a symbol from a library loaded via DT_NEEDED doesn't match
+	the symbol referenced by regular object.
+
 2016-02-01  Nathaniel Smith  <njs@pobox.com>
 
 	* peicode.h (pe_ILF_build_a_bfd): Create an import symbol for both

bfd/elflink.c

@@ -4562,8 +4562,10 @@ error_free_dyn:
 		break;
 	      }
 
-	  /* Don't add DT_NEEDED for references from the dummy bfd.  */
+	  /* Don't add DT_NEEDED for references from the dummy bfd nor
+	     for unmatched symbol.  */
 	  if (!add_needed
+	      && matched
 	      && definition
 	      && ((dynsym
 		   && h->ref_regular_nonweak

ld/ChangeLog

@@ -1,3 +1,17 @@
+2016-02-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/19553
+	* testsuite/ld-elf/indirect.exp: Run tests for PR ld/19553.
+	* testsuite/ld-elf/pr19553.map: New file.
+	* testsuite/ld-elf/pr19553.map: Likewise.
+	* testsuite/ld-elf/pr19553a.c: Likewise.
+	* testsuite/ld-elf/pr19553b.c: Likewise.
+	* testsuite/ld-elf/pr19553b.out: Likewise.
+	* testsuite/ld-elf/pr19553c.c: Likewise.
+	* testsuite/ld-elf/pr19553c.out: Likewise.
+	* testsuite/ld-elf/pr19553d.c: Likewise.
+	* testsuite/ld-elf/pr19553d.out: Likewise.
+
 2016-01-30  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/19539

ld/testsuite/ld-elf/indirect.exp

@@ -66,7 +66,11 @@ if { ![ld_compile $CC $srcdir/$subdir/indirect1a.c tmpdir/indirect1a.o]
      || ![ld_compile $CC $srcdir/$subdir/indirect4a.c tmpdir/indirect4a.o]
      || ![ld_compile $CC $srcdir/$subdir/indirect4b.c tmpdir/indirect4b.o]
      || ![ld_compile "$CC -O2 -fPIC -I../bfd" $srcdir/$subdir/pr18720a.c tmpdir/pr18720a.o]
-     || ![ld_compile $CC $srcdir/$subdir/pr18720b.c tmpdir/pr18720b.o] } {
+     || ![ld_compile $CC $srcdir/$subdir/pr18720b.c tmpdir/pr18720b.o]
+     || ![ld_compile "$CC -fPIC" $srcdir/$subdir/pr19553d.c tmpdir/pr19553d.o]
+     || ![ld_compile "$CC -fPIC" $srcdir/$subdir/pr19553c.c tmpdir/pr19553c.o]
+     || ![ld_compile "$CC -fPIC" $srcdir/$subdir/pr19553b.c tmpdir/pr19553b.o]
+     || ![ld_compile $CC $srcdir/$subdir/pr19553a.c tmpdir/pr19553a.o] } {
     unresolved "Indirect symbol tests"
     return
 }
@@ -87,6 +91,15 @@ set build_tests {
   {"Build pr18720b1.o"
    "-r -nostdlib tmpdir/pr18720b.o" ""
    {dummy.c} {} "pr18720b1.o"}
+  {"Build libpr19553b.so"
+   "-shared -Wl,--version-script=pr19553.map" "-fPIC"
+   {pr19553b.c} {} "libpr19553b.so"}
+  {"Build libpr19553c.so"
+   "-shared -Wl,--version-script=pr19553.map" "-fPIC"
+   {pr19553c.c} {} "libpr19553c.so"}
+  {"Build libpr19553d.so"
+   "-shared tmpdir/libpr19553c.so" "-fPIC"
+   {pr19553d.c} {} "libpr19553d.so"}
 }
 
 run_cc_link_tests $build_tests
@@ -155,6 +168,15 @@ set run_tests {
     {"Run with libpr18720c.so 5"
      "tmpdir/libpr18720c.so tmpdir/pr18720b1.o tmpdir/pr18720a.o" ""
      {check-ptr-eq.c} "pr18720d" "pr18720.out"}
+    {"Run with libpr19553b.so"
+     "tmpdir/libpr19553b.so tmpdir/libpr19553d.so -rpath-link ." ""
+     {pr19553a.c} "pr19553b" "pr19553b.out"}
+    {"Run with libpr19553c.so"
+     "tmpdir/libpr19553c.so tmpdir/libpr19553b.so tmpdir/libpr19553d.so" ""
+     {pr19553a.c} "pr19553c" "pr19553c.out"}
+    {"Run with libpr19553d.so"
+     "tmpdir/libpr19553d.so tmpdir/libpr19553b.so -rpath-link ." ""
+     {pr19553a.c} "pr19553d" "pr19553d.out"}
 }
 
 run_ld_link_exec_tests [] $run_tests

ld/testsuite/ld-elf/pr19553.map

@@ -0,0 +1,5 @@
+FOO
+{
+global:
+  foo;
+};

ld/testsuite/ld-elf/pr19553a.c

@@ -0,0 +1,8 @@
+extern void foo (void);
+
+int
+main (void)
+{
+  foo ();
+  return 0;
+}

ld/testsuite/ld-elf/pr19553b.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+__attribute__ ((weak))
+void
+foo (void)
+{
+  printf ("pr19553b\n");
+}

ld/testsuite/ld-elf/pr19553b.out

@@ -0,0 +1 @@
+pr19553b

ld/testsuite/ld-elf/pr19553c.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+
+void
+foo (void)
+{
+  printf ("pr19553c\n");
+}
+
+asm (".symver foo,foo@FOO");

ld/testsuite/ld-elf/pr19553c.out

@@ -0,0 +1 @@
+pr19553c

ld/testsuite/ld-elf/pr19553d.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+__attribute__ ((weak))
+void
+foo (void)
+{
+  printf ("pr19553d\n");
+}

ld/testsuite/ld-elf/pr19553d.out

@@ -0,0 +1 @@
+pr19553d