Also preserve the SHF_COMPRESSED bit

For objcopy and relocatable link, we should also preserve the
SHF_COMPRESSED bit if not decompress.

	* elf.c (_bfd_elf_init_private_section_data): Also preserve the
	SHF_COMPRESSED bit if not decompress.

bfd/ChangeLog

@@ -1,3 +1,8 @@
+2015-04-04  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* elf.c (_bfd_elf_init_private_section_data): Also preserve the
+	SHF_COMPRESSED bit if not decompress.
+
 2015-04-04  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* compress.c (get_uncompressed_size): New.  Extracted from ...

bfd/elf.c

@@ -6680,6 +6680,11 @@ _bfd_elf_init_private_section_data (bfd *ibfd,
 	  elf_next_in_group (osec) = elf_next_in_group (isec);
 	  elf_section_data (osec)->group = elf_section_data (isec)->group;
 	}
+
+      /* If not decompress, preserve SHF_COMPRESSED.  */
+      if ((ibfd->flags & BFD_DECOMPRESS) == 0)
+	elf_section_flags (osec) |= (elf_section_flags (isec)
+				     & SHF_COMPRESSED);
     }
 
   ihdr = &elf_section_data (isec)->this_hdr;