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c++: Fix ICE with error mark for an attribute [PR124307]

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After r16-6808-g4b0e94b394fa38, we started to ICE when the
std_attrs was error_mark_node. This fixes the problem by
checking if it was an error_mark_node before looking for
annotations.

Bootstrapped and tested on x86_64-linux-gnu with no regressions.

Changes since v1:
 * v2: Move the check for error mark earlier.
 * v3: small formating changes.

	PR c++/124307

gcc/cp/ChangeLog:

	* parser.cc (cp_parser_base_specifier): Check for
	error mark like checking for non-nullness on the
	attribute.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/alignas24.C: New test.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
This commit is contained in:
Andrew Pinski
2026-03-14 23:36:56 -07:00
parent c362a260ca
commit 57ccf06509
2 changed files with 6 additions and 1 deletions
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2
gcc/cp/parser.cc
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@@ -31830,7 +31830,7 @@ cp_parser_base_specifier (cp_parser* parser)
tree std_attrs = cp_parser_std_attribute_spec_seq (parser);
tree annotations = NULL_TREE;
if (std_attrs != NULL_TREE)
if (std_attrs != NULL_TREE && std_attrs != error_mark_node)
{
tree *pannotations = &annotations;
for (tree attr = std_attrs; attr; attr = TREE_CHAIN (attr))

5
gcc/testsuite/g++.dg/cpp0x/alignas24.C Normal file
View File

@@ -0,0 +1,5 @@
// PR c++/124307
// { dg-do compile { target c++11 } }
// { dg-options "" }
class : alignas // { dg-error "" }