LD/ELF: Unify STB_GNU_UNIQUE handling

Take STB_GNU_UNIQUE handling scattered across targets and gather it in
the generic ELF linker.  Update test suite infrastructure accordingly.

	bfd/
	* elf-s390-common.c (elf_s390_add_symbol_hook): Remove
	STB_GNU_UNIQUE handling.
	* elf32-arc.c (elf_arc_add_symbol_hook): Likewise.
	* elf32-arm.c (elf32_arm_add_symbol_hook): Likewise.
	* elf32-m68k.c (elf_m68k_add_symbol_hook): Likewise.
	* elf32-ppc.c (ppc_elf_add_symbol_hook): Likewise.
	* elf32-sparc.c (elf32_sparc_add_symbol_hook): Likewise.
	* elf64-ppc.c (ppc64_elf_add_symbol_hook): Likewise.
	* elf64-sparc.c (elf64_sparc_add_symbol_hook): Likewise.
	* elf64-x86-64.c (elf_x86_64_add_symbol_hook): Likewise.
	* elfxx-aarch64.c (_bfd_aarch64_elf_add_symbol_hook): Likewise.
	* elfxx-mips.c (_bfd_mips_elf_add_symbol_hook): Likewise.
	* elf32-i386.c (elf_i386_add_symbol_hook): Remove function.
	(elf_backend_add_symbol_hook): Remove macro.
	* elflink.c (elf_link_add_object_symbols): Set `has_gnu_symbols'
	for STB_GNU_UNIQUE symbols.

	binutils/
	* testsuite/lib/binutils-common.exp (supports_gnu_unique): New
	procedure.
	* testsuite/binutils-all/objcopy.exp: Use `supports_gnu_unique'
	with the `strip-10' test.

	ld/
	* testsuite/ld-unique/unique.exp: Use `is_elf_format' and
	`supports_gnu_unique' to qualify testing.

binutils/ChangeLog

@@ -1,3 +1,10 @@
+2016-05-17  Maciej W. Rozycki  <macro@imgtec.com>
+
+	* testsuite/lib/binutils-common.exp (supports_gnu_unique): New
+	procedure.
+	* testsuite/binutils-all/objcopy.exp: Use `supports_gnu_unique'
+	with the `strip-10' test.
+
 2016-05-16  Maciej W. Rozycki  <macro@imgtec.com>
 
 	* testsuite/binutils-all/objcopy.exp: Don't skip the `strip-10'

binutils/testsuite/binutils-all/objcopy.exp

@@ -1060,11 +1060,8 @@ if [is_elf_format] {
     run_dump_test "strip-8"
     run_dump_test "strip-9"
     run_dump_test "strip-12"
-    # Non-EABI ARM targets will set OSABI to ARM
-    if { ![istarget "*-*-hpux*"]
-	 && ![istarget "msp*-*-*"]
-	 && ![istarget "visium-*-*"]
-         && !([istarget "arm*-*-*"] && ![istarget "arm-*-*eabi*"])} {
+    # This requires STB_GNU_UNIQUE support with OSABI set to GNU.
+    if { [supports_gnu_unique] } {
 	run_dump_test "strip-10"
     }
     set extra_strip11 ""

binutils/testsuite/lib/binutils-common.exp

@@ -162,6 +162,46 @@ proc is_elf64 { binary_file } {
     return 0
 }
 
+# True if the ELF target supports STB_GNU_UNIQUE with the ELF header's
+# OSABI field set to ELFOSABI_GNU.
+#
+# This generally depends on the target OS only, however there are a
+# number of exceptions for bare metal targets as follows.  The MSP430
+# and Visium targets set OSABI to ELFOSABI_STANDALONE and cannot
+# support STB_GNU_UNIQUE.  Likewise non-EABI ARM targets set OSABI to
+# ELFOSABI_ARM, and TI C6X targets to ELFOSABI_C6000_*.  Finally
+# rather than `bfd_elf_final_link' AM33/2.0, D30V, DLX, i960, and
+# picoJava targets use `_bfd_generic_final_link', which does not
+# support STB_GNU_UNIQUE symbol binding causing assertion failures.
+#
+proc supports_gnu_unique {} {
+    if { [istarget *-*-gnu*]
+	 || [istarget *-*-linux*]
+	 || [istarget *-*-nacl*] } {
+	return 1
+    }
+    if { [istarget "arm*-*-*eabi*"] } {
+	return 1
+    }
+    if { ![istarget "*-*-elf*"] } {
+	return 0
+    }
+    if { [istarget "arm*-*-*"]
+	 || [istarget "msp430-*-*"]
+	 || [istarget "tic6x-*-*"]
+	 || [istarget "visium-*-*"] } {
+	return 0
+    }
+    if { [istarget "am33_2.0-*-*"]
+	 || [istarget "d30v-*-*"]
+	 || [istarget "dlx-*-*"]
+	 || [istarget "i960-*-*"]
+	 || [istarget "pj*-*-*"] } {
+	return 0
+    }
+    return 1
+}
+
 # Compare two files line-by-line.  FILE_1 is the actual output and FILE_2
 # is the expected output.  Ignore blank lines in either file.
 #