[gcc r9-10176] c++: array new initialized from a call [PR99643]

[Jason Merrill <jason@gcc.gnu.org>]

https://gcc.gnu.org/g:4231a43fd4ac6ccffd4d4b7cca70d45b2368cede

commit r9-10176-g4231a43fd4ac6ccffd4d4b7cca70d45b2368cede
Author: Jason Merrill <jason@redhat.com>
Date:   Sat Apr 3 16:17:29 2021 -0400

    c++: array new initialized from a call [PR99643]
    
    Here the get_foo() call results in a TARGET_EXPR, which we strip in
    massage_init_elt, but then when build_vec_init tries to use it to initialize
    the array element we crash because build_aggr_init expects a class rvalue to
    have a TARGET_EXPR.  So don't strip it.
    
    The stripping was added in r206639 for PR59659, so I checked that removing
    it didn't significantly increase compile time or memory usage for that
    testcase; compile time was unaffected, memory usage increased by 0.00004%.
    
    gcc/cp/ChangeLog:
    
            PR c++/99643
            * typeck2.c (massage_init_elt): Don't strip TARGET_EXPR.
    
    gcc/testsuite/ChangeLog:
    
            PR c++/99643
            * g++.dg/cpp0x/initlist-new5.C: New test.

Diff:
---
 gcc/cp/typeck2.c                           | 3 ---
 gcc/testsuite/g++.dg/cpp0x/initlist-new5.C | 9 +++++++++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/gcc/cp/typeck2.c b/gcc/cp/typeck2.c
index e7e85337d76..72d2bc3121e 100644
--- a/gcc/cp/typeck2.c
+++ b/gcc/cp/typeck2.c
@@ -1358,9 +1358,6 @@ massage_init_elt (tree type, tree init, int nested, int flags,
   flags &= LOOKUP_ALLOW_FLEXARRAY_INIT;
   flags |= LOOKUP_IMPLICIT;
   init = digest_init_r (type, init, nested ? 2 : 1, flags, complain);
-  /* Strip a simple TARGET_EXPR when we know this is an initializer.  */
-  if (SIMPLE_TARGET_EXPR_P (init))
-    init = TARGET_EXPR_INITIAL (init);
   /* When we defer constant folding within a statement, we may want to
      defer this folding as well.  */
   tree t = fold_non_dependent_init (init, complain);
diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist-new5.C b/gcc/testsuite/g++.dg/cpp0x/initlist-new5.C
new file mode 100644
index 00000000000..da54d8981d4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/initlist-new5.C
@@ -0,0 +1,9 @@
+// PR c++/99643
+// { dg-do compile { target c++11 } }
+
+struct Foo {};
+Foo get_foo();
+
+int main() {
+    new Foo[1]{get_foo()};
+}