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
