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* [gcc r14-2199] c++: NSDMI instantiation during overload resolution [PR110468]
@ 2023-06-29 20:10 Patrick Palka
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From: Patrick Palka @ 2023-06-29 20:10 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:9479da4515f7d019b4ef282d0e21536431c44f71
commit r14-2199-g9479da4515f7d019b4ef282d0e21536431c44f71
Author: Patrick Palka <ppalka@redhat.com>
Date: Thu Jun 29 16:10:18 2023 -0400
c++: NSDMI instantiation during overload resolution [PR110468]
Here we find ourselves instantiating the NSDMI for A<1>::m when
computing argument conversions during overload resolution, and
thus tf_conv is set. The flag causes mark_used for the constructor
used in the NSDMI to exit early and not instantiate its noexcept-spec,
which eventually leads to an ICE from nothrow_spec_p.
This patch fixes this by clearing any special 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.
Diff:
---
gcc/cp/init.cc | 4 ++++
gcc/testsuite/g++.dg/cpp0x/noexcept79.C | 18 ++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/gcc/cp/init.cc b/gcc/cp/init.cc
index af6e30f511e..ff5014ca576 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)
{
+ /* Clear any special tsubst flags; the result of NSDMI instantiation
+ should be independent of the substitution context. */
+ 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 = {{}};
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