Create a PLT entry for R_X86_64_PC32 in non-code sections

Since something like ".long foo - ." may be used as pointer, we make
sure that PLT is used if foo is a function defined in a shared library.

bfd/

	PR ld/19031
	* elf64-x86-64.c (elf_x86_64_check_relocs): Set
	pointer_equality_needed for R_X86_64_PC32 reloc in non-code
	sections.

ld/testsuite/

	PR ld/19031
	* ld-x86-64/x86-64.exp: Run PR ld/19031 test.
	* ld-x86-64/pr19031.out: New file.
	* ld-x86-64/pr19031a.c: Likewise.
	* ld-x86-64/pr19031b.S: Likewise.
	* ld-x86-64/pr19031c.c: Likewise.

5 files changed, 53 insertions, 0 deletions

diff --git a/ld/testsuite/ld-x86-64/pr19031.out b/ld/testsuite/ld-x86-64/pr19031.out
new file mode 100644
index 0000000..d86bac9
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19031.out
@@ -0,0 +1 @@
+OK
diff --git a/ld/testsuite/ld-x86-64/pr19031a.c b/ld/testsuite/ld-x86-64/pr19031a.c
new file mode 100644
index 0000000..fa34d37
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19031a.c
@@ -0,0 +1,4 @@
+void
+f (void)
+{
+}
diff --git a/ld/testsuite/ld-x86-64/pr19031b.S b/ld/testsuite/ld-x86-64/pr19031b.S
new file mode 100644
index 0000000..ccc9125
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19031b.S
@@ -0,0 +1,18 @@
+	.text
+	.globl g
+	.type g, @function
+g:
+	movq f@GOTPCREL(%rip), %rax
+	retq
+
+	.globl h
+	.type h, @function
+h:
+	leaq zed, %rax
+	movslq zed, %rbx
+	addq %rbx, %rax
+	retq
+
+	.data
+zed:
+        .long f - .
diff --git a/ld/testsuite/ld-x86-64/pr19031c.c b/ld/testsuite/ld-x86-64/pr19031c.c
new file mode 100644
index 0000000..60eccaf
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr19031c.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+extern void *h (void);
+extern void *g (void);
+
+int
+main (void)
+{
+
+  if (h () == g ())
+    printf ("OK\n");
+
+  return 0;
+}
diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp
index 5de67ca..69728c2 100644
--- a/ld/testsuite/ld-x86-64/x86-64.exp
+++ b/ld/testsuite/ld-x86-64/x86-64.exp
@@ -503,6 +503,14 @@ if { [isnative] && [which $CC] != 0 } {
 	    {{readelf {-Wrd} pr18900b.rd}} \
 	    "pr18900b" \
 	] \
+	[list \
+	    "Build pr19031.so" \
+	    "-shared" \
+	    "-fPIC" \
+	    { pr19031a.c } \
+	    "" \
+	    "pr19031.so" \
+	] \
     ]
 
     run_ld_link_exec_tests [] [list \
@@ -557,6 +565,14 @@ if { [isnative] && [which $CC] != 0 } {
 	    "pr18900" \
 	    "pr18900.out" \
 	] \
+	[list \
+	    "Run pr19031" \
+	    "tmpdir/pr19031.so" \
+	    "" \
+	    { pr19031b.S pr19031c.c } \
+	    "pr19031" \
+	    "pr19031.out" \
+	] \
     ]
 
     if { [istarget "x86_64-*-linux*"] \