C++ PATCH for c++/92134 - constinit malfunction in static data member

[Marek Polacek]

I wasn't properly setting LOOKUP_CONSTINIT in grokfield and so we didn't
detect a non-const initializer.

Bootstrapped/regtested on x86_64-linux, ok for trunk?

2019-10-24  Marek Polacek  <pola...@redhat.com>

        PR c++/92134 - constinit malfunction in static data member.
        * decl2.c (grokfield): Set LOOKUP_CONSTINIT.

        * g++.dg/cpp2a/constinit14.C: New test.

diff --git gcc/cp/decl2.c gcc/cp/decl2.c
index 6d5e973b487..a630ee31397 100644
--- gcc/cp/decl2.c
+++ gcc/cp/decl2.c
@@ -990,6 +990,9 @@ grokfield (const cp_declarator *declarator,
   else
     flags = LOOKUP_IMPLICIT;
 
+  if (decl_spec_seq_has_spec_p (declspecs, ds_constinit))
+    flags |= LOOKUP_CONSTINIT;
+
   switch (TREE_CODE (value))
     {
     case VAR_DECL:
diff --git gcc/testsuite/g++.dg/cpp2a/constinit14.C 
gcc/testsuite/g++.dg/cpp2a/constinit14.C
new file mode 100644
index 00000000000..72bfab667b8
--- /dev/null
+++ gcc/testsuite/g++.dg/cpp2a/constinit14.C
@@ -0,0 +1,13 @@
+// PR c++/92134 - constinit malfunction in static data member.
+// { dg-do compile { target c++2a } }
+
+struct Value {
+  Value() : v{new int{42}} {}
+  int* v;
+};
+
+struct S {
+  static constinit inline Value v{}; // { dg-error "variable .S::v. does not 
have a constant initializer|call to non-.constexpr. function" }
+};
+
+int main() { return *S::v.v; }