[Bug c++/67371] Never executed "throw" in constexpr function fails to compile

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67371

--- Comment #8 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Author: trippels
Date: Sat Aug 29 18:51:26 2015
New Revision: 227323

URL: https://gcc.gnu.org/viewcvs?rev=227323&root=gcc&view=rev
Log:
Fix c++/67371 (issues with throw in constexpr)

As PR67371 shows gcc currently rejects all throw statements in
constant-expressions, even when they are never executed.

        PR c++/67371
        * constexpr.c (potential_constant_expression_1): Remove IF_STMT
        case. Move label to COND_EXPR case. Remove checking of
        SWITCH_STMT_BODY.

Added:
    trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-new.C
    trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-throw.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constexpr.c