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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/65015] LTO produces randomly ordered debug information
Date: Fri, 13 Feb 2015 11:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65015

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hjl.tools at gmail dot com
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Difference in readelf -a is

--- x   2015-02-13 12:04:07.526383914 +0100
+++ y   2015-02-13 12:04:10.158414178 +0100
@@ -234,7 +234,7 @@
     42: 0000000000600df8     0 OBJECT  LOCAL  DEFAULT   19
__do_global_dtors_aux_fin
     43: 0000000000400580     0 FUNC    LOCAL  DEFAULT   13 frame_dummy
     44: 0000000000600df0     0 OBJECT  LOCAL  DEFAULT   18
__frame_dummy_init_array_
-    45: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS cc5R4C1Y.ltrans0.o
+    45: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS ccqmAj6c.ltrans0.o
     46: 00000000004005b1    11 FUNC    LOCAL  DEFAULT   13 helper
     47: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS elf-init.c
     48: 0000000000000000     0 FILE    LOCAL  DEFAULT  ABS crtstuff.c

that is, somehow .symtab contains a reference to the ltrans object file name,
probably because of

        .file   "ccqmAj6c.ltrans0.o"

we emit via output_file_directive. Unfortunately omitting that doesn't help.
It seems that the linker itself adds those symbols!?  HJ?

Gold doesn't do that (thus, it works with -fuse-ld=gold).