From: Nicholas Krause <xerofo...@gmail.com>
This fixs the PR95672 by adding the missing TYPE_PACK_EXPANSION case in
cxx_incomplete_type_diagnostic in order to avoid ICES on diagnosing
incomplete template pack expansion cases. In v2, add the missing required
test case for all new patches. v3 Fixes both the test case to compile in
C++11 mode and the message to print out only the type. v4 fixes the testcase
to only target C++11. v5 fixes test case to run properly.
gcc/cp/ChangeLog:
* typeck2.c (cxx_incomplete_type_diagnostic): Add missing
TYPE_EXPANSION_PACK
check for diagnosticing incomplete types in
cxx_incomplete_type_diagnostic.
gcc/testsuite/ChangeLog:
* g++.dg/template/PR95672.C: New test.
Signed-off-by: Nicholas Krause <xerofo...@gmail.com>
---
gcc/cp/typeck2.c | 6 ++++++
gcc/testsuite/g++.dg/template/PR95672.C | 3 +++
2 files changed, 9 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/template/PR95672.C
diff --git a/gcc/cp/typeck2.c b/gcc/cp/typeck2.c
index 5fd3b82fa89..28b32fe0b5a 100644
--- a/gcc/cp/typeck2.c
+++ b/gcc/cp/typeck2.c
@@ -552,6 +552,12 @@ cxx_incomplete_type_diagnostic (location_t loc, const_tree
value,
TYPE_NAME (type));
break;
+ case TYPE_PACK_EXPANSION:
+ emit_diagnostic (diag_kind, loc, 0,
+ "invalid use of pack expansion %qT",
+ type);
+ break;
+
case TYPENAME_TYPE:
case DECLTYPE_TYPE:
emit_diagnostic (diag_kind, loc, 0,
diff --git a/gcc/testsuite/g++.dg/template/PR95672.C
b/gcc/testsuite/g++.dg/template/PR95672.C
new file mode 100644
index 00000000000..fcc3da0a132
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/PR95672.C
@@ -0,0 +1,3 @@
+//c++ PR96572
+// { dg-do compile { target c++11 } }
+struct g_class : decltype (auto) ... { } ; // { dg-error "invalid use of
pack expansion" }
--
2.20.1
