From 1659f720b0818d6666570f79bef53ac461b2b22f Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Sat, 25 Jul 2015 07:56:18 -0700
Subject: [PATCH] Skip missing symbol version section check for executable

Missing symbol version section is a run-time problem only if it will
be referenced dynamically at run-time.  We should skip the check for
locally defined symbol, which isn't referenced by shared library, when
linking executable.

bfd/

	PR ld/18718
	* elflink.c (elf_link_output_extsym): Check symbol version
	section check only if not linking executable, the symbol is
	referenced by shared library or not locally defined.

ld/testsuite/

	PR ld/18718
	* ld-elf/pr18718.c: New file.
	* ld-elf/shared.exp: Run tests for PR ld/18718.
---
 bfd/elflink.c                  |  8 ++++--
 ld/testsuite/ld-elf/pr18718.c  | 26 ++++++++++++++++++++
 ld/testsuite/ld-elf/shared.exp | 45 ++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+), 2 deletions(-)
 create mode 100644 ld/testsuite/ld-elf/pr18718.c

diff --git a/bfd/elflink.c b/bfd/elflink.c
index b741e7ebcd..ccb7ba23a3 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -9217,8 +9217,12 @@ elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
 
       /* Since there is no version information in the dynamic string,
 	 if there is no version info in symbol version section, we will
-	 have a run-time problem.  */
-      if (h->verinfo.verdef == NULL)
+	 have a run-time problem if not linking executable, referenced
+	 by shared library, or not locally defined.  */
+      if (h->verinfo.verdef == NULL
+	  && (!flinfo->info->executable
+	      || h->ref_dynamic
+	      || !h->def_regular))
 	{
 	  char *p = strrchr (h->root.root.string, ELF_VER_CHR);
 
diff --git a/ld/testsuite/ld-elf/pr18718.c b/ld/testsuite/ld-elf/pr18718.c
new file mode 100644
index 0000000000..de628ef24a
--- /dev/null
+++ b/ld/testsuite/ld-elf/pr18718.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <bfd_stdint.h>
+
+extern void foo (void);
+
+void
+new_foo (void)
+{
+}
+
+__asm__(".symver new_foo, foo@@VERS_2.0");
+
+__attribute__ ((noinline, noclone))
+int
+bar (void)
+{
+  return (intptr_t) &foo == 0x12345678 ? 1 : 0;
+}
+
+int
+main(void)
+{
+  bar ();
+  printf("PASS\n");
+  return 0;
+}
diff --git a/ld/testsuite/ld-elf/shared.exp b/ld/testsuite/ld-elf/shared.exp
index bcbe8e211e..92188f9349 100644
--- a/ld/testsuite/ld-elf/shared.exp
+++ b/ld/testsuite/ld-elf/shared.exp
@@ -529,5 +529,50 @@ if { [istarget *-*-linux*]
 	    "pr2404.out" \
 	    "-fPIE" \
 	] \
+	[list \
+	    "Run pr18718" \
+	    "" \
+	    "" \
+	    { pr18718.c } \
+	    "pr18718" \
+	    "pass.out" \
+	    "-I../bfd" \
+	] \
+	[list \
+	    "Run pr18718 with PIE (1)" \
+	    "-pie" \
+	    "" \
+	    { pr18718.c } \
+	    "pr18718pie1" \
+	    "pass.out" \
+	    "-fPIE -I../bfd" \
+	] \
+	[list \
+	    "Run pr18718 with PIE (2)" \
+	    "" \
+	    "" \
+	    { pr18718.c } \
+	    "pr18718pie2" \
+	    "pass.out" \
+	    "-fPIE -I../bfd" \
+	] \
+	[list \
+	    "Run pr18718 with PIC (1)" \
+	    "" \
+	    "" \
+	    { pr18718.c } \
+	    "pr18718pic1" \
+	    "pass.out" \
+	    "-fPIC -I../bfd" \
+	] \
+	[list \
+	    "Run pr18718 with PIC (2)" \
+	    "-pie" \
+	    "" \
+	    { pr18718.c } \
+	    "pr18718pic2" \
+	    "pass.out" \
+	    "-fPIC -I../bfd" \
+	] \
     ]
 }