Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for
trunk/13/12?
-- >8 --
Here we find ourselves instantiating the NSDMI for A<1>::m when
computing argument conversions during overload resolution, and
thus tf_conv is set. This causes mark_used for the constructor
used in the NSDMI to exit early and not instantiate its noexcept-spec,
leading to an ICE from nothrow_spec_p.
This patch fixes this by clearing any unusual tsubst flags during
instantiation of an NSDMI, since the result should be independent of
the context that requires the instantiation.
PR c++/110468
gcc/cp/ChangeLog:
* init.cc (maybe_instantiate_nsdmi_init): Mask out all
tsubst flags except for tf_warning_or_error.
gcc/testsuite/ChangeLog:
* g++.dg/cpp0x/noexcept79.C: New test.
---
gcc/cp/init.cc | 4 ++++
gcc/testsuite/g++.dg/cpp0x/noexcept79.C | 18 ++++++++++++++++++
2 files changed, 22 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/cpp0x/noexcept79.C
diff --git a/gcc/cp/init.cc b/gcc/cp/init.cc
index af6e30f511e..f01a11c5299 100644
--- a/gcc/cp/init.cc
+++ b/gcc/cp/init.cc
@@ -579,6 +579,10 @@ maybe_instantiate_nsdmi_init (tree member, tsubst_flags_t
complain)
/* tsubst_decl uses void_node to indicate an uninstantiated DMI. */
if (init == void_node)
{
+ /* The result of NSDMI instantiation should be independent of
+ the tsubst flags we're given. */
+ complain &= tf_warning_or_error;
+
init = DECL_INITIAL (DECL_TI_TEMPLATE (member));
location_t expr_loc
= cp_expr_loc_or_loc (init, DECL_SOURCE_LOCATION (member));
diff --git a/gcc/testsuite/g++.dg/cpp0x/noexcept79.C
b/gcc/testsuite/g++.dg/cpp0x/noexcept79.C
new file mode 100644
index 00000000000..d1f54d14431
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/noexcept79.C
@@ -0,0 +1,18 @@
+// PR c++/110468
+// { dg-do compile { target c++11 } }
+
+template<int T>
+struct variant {
+ variant() noexcept(T > 0);
+};
+
+template<int N>
+struct A {
+ variant<N> m = {};
+};
+
+struct B {
+ B(A<1>);
+};
+
+B b = {{}};
--
2.41.0.199.ga9e066fa63
