[Bug c++/83921] [7/8 Regression] GCC rejects constexpr initialization of empty aggregate.

[paolo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83921

--- Comment #4 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed Jan 24 00:57:18 2018
New Revision: 257009

URL: https://gcc.gnu.org/viewcvs?rev=257009&root=gcc&view=rev
Log:
/cp
2018-01-23  Paolo Carlini  <paolo.carlini@oracle.com>

        PR c++/83921
        * decl.c (check_for_uninitialized_const_var): Not static; add
        bool and tsubst_flags_t parameters; adjust to be used both in
        constexpr context and not.
        * constexpr.c (potential_constant_expression_1): Use the above.
        * cp-tree.h (check_for_uninitialized_const_var): Declare.

/testsuite
2018-01-23  Paolo Carlini  <paolo.carlini@oracle.com>

        PR c++/83921
        * g++.dg/cpp1y/constexpr-83921-1.C: New.
        * g++.dg/cpp1y/constexpr-83921-2.C: Likewise.
        * g++.dg/cpp1y/constexpr-83921-3.C: Likewise.
        * g++.dg/ext/stmtexpr20.C: Likewise.
        * g++.dg/ext/stmtexpr21.C: Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-83921-1.C
    trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-83921-2.C
    trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-83921-3.C
    trunk/gcc/testsuite/g++.dg/ext/stmtexpr20.C
    trunk/gcc/testsuite/g++.dg/ext/stmtexpr21.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constexpr.c
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/decl.c
    trunk/gcc/testsuite/ChangeLog