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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/101473] debug_line info depends on toolchain path
Date: Mon, 19 Jul 2021 14:17:34 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101473

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #9)
> (In reply to Richard Biener from comment #8)
> > (In reply to tonyb from comment #6)
> > > The only thing I know is that roughly similar issues were handled wit=
h the
> > > -fdebug-prefix-map=3Dold=3Dnew switch, but I am not the expert.
> >=20
> > Yes, that works to strip the install location as well.  So not a bug?
>=20
> But then -fdebug-prefix-map is applied after computing the CU checksum
> and thus after producing the symbol that shows the difference with -flto.

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 82783c4968b..07ea7c5af0c 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -7064,7 +7064,7 @@ attr_checksum (dw_attr_node *at, struct md5_ctx *ctx,=
 int
*mark)

     case dw_val_class_file:
     case dw_val_class_file_implicit:
-      CHECKSUM_STRING (AT_file (at)->filename);
+      CHECKSUM_STRING (remap_debug_filename (AT_file (at)->filename));
       break;

     case dw_val_class_data8:

might fix it (I wonder if we shouldn't simply remap once when we generate
the locations rather than in dozen places...).=