From: Jason Merrill <jason@redhat.com>
Date: Thu, 9 Mar 2023 22:35:24 +0000 (-0500)
Subject: c++: signed __int128_t [PR108099]
X-Git-Tag: releases/gcc-12.3.0~87
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=32955c1c2246aa336d3fd2423c32546c39a6ca30;p=thirdparty%2Fgcc.git

c++: signed __int128_t [PR108099]

The code for handling signed + typedef was breaking on __int128_t, because
it isn't a proper typedef: it doesn't have DECL_ORIGINAL_TYPE.

	PR c++/108099

gcc/cp/ChangeLog:

	* decl.cc (grokdeclarator): Handle non-typedef typedef_decl.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/int128-7.C: New test.
---

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 16ddea1099ea..dcb9f0c47034 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -12300,10 +12300,15 @@ grokdeclarator (const cp_declarator *declarator,
 	{
 	  if (typedef_decl)
 	    {
-	      pedwarn (loc, OPT_Wpedantic, "%qs specified with %qT",
-		       key, type);
+	      pedwarn (loc, OPT_Wpedantic, "%qs specified with %qD",
+		       key, typedef_decl);
 	      ok = !flag_pedantic_errors;
-	      type = DECL_ORIGINAL_TYPE (typedef_decl);
+	      if (is_typedef_decl (typedef_decl))
+		type = DECL_ORIGINAL_TYPE (typedef_decl);
+	      else
+		/* PR108099: __int128_t comes from c_common_nodes_and_builtins,
+		   and is not built as a typedef.  */
+		type = TREE_TYPE (typedef_decl);
 	      typedef_decl = NULL_TREE;
 	    }
 	  else if (declspecs->decltype_p)
diff --git a/gcc/testsuite/g++.dg/ext/int128-7.C b/gcc/testsuite/g++.dg/ext/int128-7.C
new file mode 100644
index 000000000000..bf5e8c40a4b2
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/int128-7.C
@@ -0,0 +1,4 @@
+// PR c++/108099
+// { dg-do compile { target { c++11 && int128 } } }
+
+using i128 = signed __int128_t;	// { dg-error "specified with" }