[Bug lto/65015] LTO produces randomly ordered debug information

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65015

--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
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