From 538a0d0f29b12cff05681b6de2e0a3d7b33f3ef0 Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Mon, 13 Mar 2023 14:06:11 -0400
Subject: [PATCH] c++: handle _FloatNN redeclaration like bool [PR107128]

It's been inconvenient to compile testcases preprocessed with GCC 12 or
earlier because they break on

  typedef __float128 _Float128;

We already had code for handling this with bool and wchar_t, it just needs
to be extended to _FloatNN as well.

	PR c++/107128

gcc/cp/ChangeLog:

	* parser.cc (cp_parser_set_decl_spec_type): Use
	redefined_builtin_type for extended_float_type_p.

gcc/testsuite/ChangeLog:

	* g++.dg/warn/pragma-system_header6.h: New test.
	* g++.dg/warn/pragma-system_header6.C: New test.
---
 gcc/cp/parser.cc                                  | 2 ++
 gcc/testsuite/g++.dg/warn/pragma-system_header6.C | 1 +
 gcc/testsuite/g++.dg/warn/pragma-system_header6.h | 3 +++
 3 files changed, 6 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/warn/pragma-system_header6.C
 create mode 100644 gcc/testsuite/g++.dg/warn/pragma-system_header6.h

diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 533041946c09..a277003ea581 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -33452,10 +33452,12 @@ cp_parser_set_decl_spec_type (cp_decl_specifier_seq *decl_specs,
      C++-safe.  */
   if (decl_spec_seq_has_spec_p (decl_specs, ds_typedef)
       && !type_definition_p
+      && TYPE_P (type_spec)
       && (type_spec == boolean_type_node
 	  || type_spec == char8_type_node
 	  || type_spec == char16_type_node
 	  || type_spec == char32_type_node
+	  || extended_float_type_p (type_spec)
 	  || type_spec == wchar_type_node)
       && (decl_specs->type
 	  || decl_spec_seq_has_spec_p (decl_specs, ds_long)
diff --git a/gcc/testsuite/g++.dg/warn/pragma-system_header6.C b/gcc/testsuite/g++.dg/warn/pragma-system_header6.C
new file mode 100644
index 000000000000..924e4522cf06
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/pragma-system_header6.C
@@ -0,0 +1 @@
+#include "pragma-system_header6.h"
diff --git a/gcc/testsuite/g++.dg/warn/pragma-system_header6.h b/gcc/testsuite/g++.dg/warn/pragma-system_header6.h
new file mode 100644
index 000000000000..989ccd8795a8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/pragma-system_header6.h
@@ -0,0 +1,3 @@
+#pragma GCC system_header
+
+typedef float _Float32;
-- 
2.47.2