Handle weak alias for PIE with copy reloc

When there is a weak symbol with a real definition, the processor
independent code will have arranged for us to see the real definition
first.  We need to copy the needs_copy bit from the real definition and
check it when allowing copy reloc in PIE.

bfd/

	PR ld/17689
	* elf64-x86-64.c (elf_x86_64_link_hash_entry): Add needs_copy.
	Change has_bnd_reloc to bit field.
	(elf_x86_64_link_hash_newfunc): Initialize needs_copy and
	has_bnd_reloc to 0.
	(elf_x86_64_check_relocs): Set has_bnd_reloc to 1 instead
	of TRUE.
	(elf_x86_64_adjust_dynamic_symbol): Copy needs_copy from the
	real definition to a weak symbol.
	(elf_x86_64_allocate_dynrelocs): Also check needs_copy of a
	weak symbol for PIE when discarding space for relocs against
	symbols which turn out to need copy relocs.
	(elf_x86_64_relocate_section): Also check needs_copy of a
	weak symbol for PIE with copy reloc.

ld/testsuite/

	PR ld/17689
	* ld-x86-64/pr17689.out: New file.
	* ld-x86-64/pr17689.rd: Likewise.
	* ld-x86-64/pr17689a.c: Likewise.
	* ld-x86-64/pr17689b.S: Likewise.

	* ld-x86-64/x86-64.exp: Run PR ld/17689 tests.

6 files changed, 60 insertions, 0 deletions

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index b27177e..bcdcf0b 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,13 @@
+2014-12-13  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/17689
+	* ld-x86-64/pr17689.out: New file.
+	* ld-x86-64/pr17689.rd: Likewise.
+	* ld-x86-64/pr17689a.c: Likewise.
+	* ld-x86-64/pr17689b.S: Likewise.
+
+	* ld-x86-64/x86-64.exp: Run PR ld/17689 tests.
+
 2014-12-06  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* lib/ld-lib.exp (check_shared_lib_support): Return 0 for Visium.
diff --git a/ld/testsuite/ld-x86-64/pr17689.out b/ld/testsuite/ld-x86-64/pr17689.out
new file mode 100644
index 0000000..7ef22e9
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr17689.out
@@ -0,0 +1 @@
+PASS
diff --git a/ld/testsuite/ld-x86-64/pr17689.rd b/ld/testsuite/ld-x86-64/pr17689.rd
new file mode 100644
index 0000000..d720a9b
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr17689.rd
@@ -0,0 +1,3 @@
+#...
+[0-9a-f ]+R_X86_64_COPY+[0-9a-f ]+ +bar \+ 0
+#...
diff --git a/ld/testsuite/ld-x86-64/pr17689a.c b/ld/testsuite/ld-x86-64/pr17689a.c
new file mode 100644
index 0000000..5317668
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr17689a.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+char *bar = "PASS";
+extern char *bar_alias __attribute__ ((weak, alias ("bar")));
+
+void
+foo (char *x)
+{
+  printf ("%s\n", x);
+}
diff --git a/ld/testsuite/ld-x86-64/pr17689b.S b/ld/testsuite/ld-x86-64/pr17689b.S
new file mode 100644
index 0000000..c95f891
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr17689b.S
@@ -0,0 +1,12 @@
+	.text
+	.globl	main
+	.type	main, @function
+main:
+	subq	$8, %rsp
+	movq	bar_alias(%rip), %rdi
+	call	foo@PLT
+	xorl	%eax, %eax
+	addq	$8, %rsp
+	ret
+	.size	main, .-main
+	.section	.note.GNU-stack,"",@progbits
diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp
index 253f0c6..443d101 100644
--- a/ld/testsuite/ld-x86-64/x86-64.exp
+++ b/ld/testsuite/ld-x86-64/x86-64.exp
@@ -416,6 +416,22 @@ if { [isnative] && [which $CC] != 0 } {
 	    {{readelf {-Wr} copyreloc-main2.rd}} \
 	    "copyreloc-main" \
 	] \
+	[list \
+	    "Build pr17689.so" \
+	    "-shared" \
+	    "-fPIC" \
+	    { pr17689a.c } \
+	    {} \
+	    "pr17689.so" \
+	] \
+	[list \
+	    "Build pr17689 with PIE without -fPIE" \
+	    "tmpdir/pr17689.so -pie" \
+	    "" \
+	    { pr17689b.S } \
+	    {{readelf {-Wr} pr17689.rd}} \
+	    "pr17689" \
+	] \
     ]
 
     run_ld_link_exec_tests [] [list \
@@ -446,6 +462,14 @@ if { [isnative] && [which $CC] != 0 } {
 	    "copyreloc-main" \
 	    "copyreloc-main.out" \
 	] \
+	[list \
+	    "Run pr17689 with PIE without -fPIE" \
+	    "tmpdir/pr17689.so -pie" \
+	    "" \
+	    { pr17689b.S } \
+	    "pr17689" \
+	    "pr17689.out" \
+	] \
     ]
 
     if { [istarget "x86_64-*-linux*"] \