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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/65015] LTO produces randomly ordered debug information
Date: Fri, 13 Feb 2015 19:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65015

--- Comment #16 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #11)
> For reference, the following patch doesn't work:
> 
> Index: gcc/varasm.c
> ===================================================================
> --- gcc/varasm.c        (revision 220677)
> +++ gcc/varasm.c        (working copy)
> @@ -7042,7 +7042,9 @@ default_file_start (void)
>        && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
>      fputs (ASM_APP_OFF, asm_out_file);
>  
> -  if (targetm.asm_file_start_file_directive)
> +  if (targetm.asm_file_start_file_directive
> +      /* LTO produced units have no meaningful main_input_filename.  */
> +      && !in_lto_p)
>      output_file_directive (asm_out_file, main_input_filename);
>  }
>  
> and -g is not necessary to trigger the bogus tempfile name in .symtab

This patch works together with BFD linker patch:

https://sourceware.org/ml/binutils/2015-02/msg00193.html