https://gcc.gnu.org/g:319f1d042179b381becf4bf1d0f6b9dab6e84884
commit r15-7301-g319f1d042179b381becf4bf1d0f6b9dab6e84884
Author: Richard Biener <rguent...@suse.de>
Date: Fri Jan 31 08:56:39 2025 +0100
debug/100530 - Revert QUAL_ADDR_SPACE handling from dwarf2out.cc
The bug clearly shows that r8-4385-ga297ccb52e0c89 was wrong in
enabling handling of address-space qualification as DWARF type
qualifiers as the code isn't prepared to it actually be not handled
and ends up changing a lesser qualified (without address-space)
type DIE in ways tripping asserts. The following reverts that
part which then causes the DIE for the same type with address-space
qualifiers removed to be re-used since there's currently no code
to encode address-spaces within dwarf2out.cc or in the DWARF spec.
r8-4385-ga297ccb52e0c89 did not come with a testcase nor a good
description of the bug fixed - I've verified const qualification
mixed with address-spaces creates the expected DWARF.
PR debug/100530
* dwarf2out.cc (modified_type_die): Do not claim we handle
address-space qualification with dwarf_qual_info[].
* gcc.target/i386/pr100530.c: New testcase.
Diff:
---
gcc/dwarf2out.cc | 3 +--
gcc/testsuite/gcc.target/i386/pr100530.c | 5 +++++
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/gcc/dwarf2out.cc b/gcc/dwarf2out.cc
index 8085b8d85d89..43884f206c07 100644
--- a/gcc/dwarf2out.cc
+++ b/gcc/dwarf2out.cc
@@ -13678,8 +13678,7 @@ modified_type_die (tree type, int cv_quals, bool
reverse,
struct array_descr_info info;
/* Only these cv-qualifiers are currently handled. */
const int cv_qual_mask = (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE
- | TYPE_QUAL_RESTRICT | TYPE_QUAL_ATOMIC |
- ENCODE_QUAL_ADDR_SPACE(~0U));
+ | TYPE_QUAL_RESTRICT | TYPE_QUAL_ATOMIC);
/* DW_AT_endianity is specified only for base types in the standard. */
const bool reverse_type
= need_endianity_attribute_p (reverse)
diff --git a/gcc/testsuite/gcc.target/i386/pr100530.c
b/gcc/testsuite/gcc.target/i386/pr100530.c
new file mode 100644
index 000000000000..005c01991295
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr100530.c
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+/* { dg-options "-g" } */
+
+__seg_gs const int var;
+__seg_gs int foo;
