A type in an anonymous namespace can never be merged with one from
another translation unit, so a member of such a type is always its own
prevailing decl.
I don't really understand the LTO concept of prevailing decl, or why we don't
get here if the destructor is defined, but this seems reasonable and fixes the
bug.
Tested x86_64-pc-linux-gnu. OK for trunk?
* lto-symtab.c (lto_symtab_prevailing_virtual_decl): Return early
for a type in an anonymous namespace.
---
gcc/lto/lto-symtab.c | 8 ++++++--
gcc/testsuite/g++.dg/lto/pr88049_0.C | 16 ++++++++++++++++
gcc/lto/ChangeLog | 6 ++++++
3 files changed, 28 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/lto/pr88049_0.C
diff --git a/gcc/lto/lto-symtab.c b/gcc/lto/lto-symtab.c
index 22da4c78b8c..343915c3cec 100644
--- a/gcc/lto/lto-symtab.c
+++ b/gcc/lto/lto-symtab.c
@@ -1085,8 +1085,12 @@ lto_symtab_prevailing_virtual_decl (tree decl)
{
if (DECL_ABSTRACT_P (decl))
return decl;
- gcc_checking_assert (!type_in_anonymous_namespace_p (DECL_CONTEXT (decl))
- && DECL_ASSEMBLER_NAME_SET_P (decl));
+
+ if (type_in_anonymous_namespace_p (DECL_CONTEXT (decl)))
+ /* There can't be any other declarations. */
+ return decl;
+
+ gcc_checking_assert (DECL_ASSEMBLER_NAME_SET_P (decl));
symtab_node *n = symtab_node::get_for_asmname
(DECL_ASSEMBLER_NAME (decl));
diff --git a/gcc/testsuite/g++.dg/lto/pr88049_0.C
b/gcc/testsuite/g++.dg/lto/pr88049_0.C
new file mode 100644
index 00000000000..7ac3618c2c8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lto/pr88049_0.C
@@ -0,0 +1,16 @@
+// PR c++/88049
+// { dg-lto-do link }
+// { dg-lto-options {{ -flto -O2 -w }} }
+// { dg-extra-ld-options -r }
+
+template <typename> class a;
+class b {};
+template <typename e> a<e> d(char);
+template <typename> class a : public b {
+public:
+ virtual ~a();
+};
+namespace {
+ class f;
+ b c = d<f>(int());
+} // namespace
diff --git a/gcc/lto/ChangeLog b/gcc/lto/ChangeLog
index 6b183df3b0f..71a2a109e64 100644
--- a/gcc/lto/ChangeLog
+++ b/gcc/lto/ChangeLog
@@ -1,3 +1,9 @@
+2019-02-18 Jason Merrill <ja...@redhat.com>
+
+ PR c++/88049 - ICE with undefined destructor and anon namespace.
+ * lto-symtab.c (lto_symtab_prevailing_virtual_decl): Return early
+ for a type in an anonymous namespace.
+
2019-01-09 Sandra Loosemore <san...@codesourcery.com>
PR other/16615
base-commit: 79ae32275d4a19a1fc6ffebec9ac15a8c94b0b8f
--
2.20.1
