[Bug c++/86608] [7/8/9 Regression] volatile variable is taken as a constexpr

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86608

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Dec 11 18:53:03 2018
New Revision: 267030

URL: https://gcc.gnu.org/viewcvs?rev=267030&root=gcc&view=rev
Log:
        PR c++/86608 - reading constexpr volatile variable.
        * constexpr.c (potential_constant_expression_1): Check want_rval
        instead of checking if we have a decl.
        * decl2.c (decl_maybe_constant_var_p): Don't consider volatile
        constexpr variables as maybe constant.

        * g++.dg/cpp0x/constexpr-volatile2.C: New test.
        * g++.dg/cpp0x/pr65327.C: Add dg-error.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-volatile2.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constexpr.c
    trunk/gcc/cp/decl2.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/cpp0x/pr65327.C