Always keep SHT_NOTE sections

bfd/

2010-01-07  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/11143
	* elflink.c (elf_gc_sweep): Keep SHT_NOTE section.

ld/testsuite/

2010-01-07  H.J. Lu  <hongjiu.lu@intel.com>

	PR ld/11143
	* ld-gc/gc.exp: Run abi-note.

	* ld-gc/abi-note.d: New.
	* ld-gc/abi-note.s: Likewise.

bfd/ChangeLog

@@ -1,3 +1,8 @@
+2010-01-07  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/11143
+	* elflink.c (elf_gc_sweep): Keep SHT_NOTE section.
+
 2010-01-04  Daniel Gutson  <dgutson@codesourcery.com>
 
 	* bfd.m4 (BFD_HAVE_SYS_PROCFS_TYPE): Define _STRUCTURE_PROC

bfd/elflink.c

@@ -1,6 +1,6 @@
 /* ELF linking support for BFD.
    Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
-   2005, 2006, 2007, 2008, 2009
+   2005, 2006, 2007, 2008, 2009, 2010
    Free Software Foundation, Inc.
 
    This file is part of BFD, the Binary File Descriptor library.
@@ -11527,9 +11527,10 @@ elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
 	      o->gc_mark = first->gc_mark;
 	    }
 	  else if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
-		   || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
+		   || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0
+		   || elf_section_data (o)->this_hdr.sh_type == SHT_NOTE)
 	    {
-	      /* Keep debug and special sections.  */
+	      /* Keep debug, special and SHT_NOTE sections.  */
 	      o->gc_mark = 1;
 	    }
 

ld/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2010-01-07  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/11143
+	* ld-gc/gc.exp: Run abi-note.
+
+	* ld-gc/abi-note.d: New.
+	* ld-gc/abi-note.s: Likewise.
 
 For older changes see ChangeLog-2009
 

ld/testsuite/ld-gc/abi-note.d

@@ -0,0 +1,8 @@
+#name: --gc-sections with note section
+#ld: --gc-sections -e _start
+#readelf: -S --wide
+#target: *-*-linux*
+
+#...
+.* .note.ABI-tag[ 	]+NOTE.*
+#...

ld/testsuite/ld-gc/abi-note.s

@@ -0,0 +1,15 @@
+	.text
+	.global _start
+_start:
+	.long 1
+
+	.section ".note.ABI-tag", "a"
+	.p2align 2
+	.long 1f - 0f		/* name length */
+	.long 3f - 2f		/* data length */
+	.long  1		/* note type */
+0:	.asciz "GNU"		/* vendor name */
+1:	.p2align 2
+2:	.long 1
+	.long 2
+3:	.p2align 2		/* pad out section */

ld/testsuite/ld-gc/gc.exp

@@ -1,5 +1,5 @@
 # Expect script for ld-gc tests
-#   Copyright 2008, 2009
+#   Copyright 2008, 2009, 2010
 #   Free Software Foundation, Inc.
 #
 # This file is part of the GNU Binutils.
@@ -90,3 +90,4 @@ test_gc "Check --gc-section/-r/-e" "gcrel" $ld "-r --gc-sections -e main"
 test_gc "Check --gc-section/-r/-u" "gcrel" $ld "-r --gc-sections -u used_func"
 
 run_dump_test "noent"
+run_dump_test "abi-note"