https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81853
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-02-16
CC| |msebor at gcc dot gnu.org
Known to work| |4.5.4
Summary|[C++14] "using namespace" |[ 6/7/8 Regression] "using
|is not a constant |namespace" is not a
|expression in function-like |constant expression in a
|macro |statement expression
Ever confirmed|0 |1
Known to fail| |4.6.4, 4.7.4, 4.8.4, 4.9.4,
| |5.5.0, 6.4.0, 7.2.0, 8.0
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with the simplified test case below. GCC 4.5 compiles the test case
without a complaint so the failure is a regression introduced in r166167.
$ cat t.C && gcc -S -Wall -Wextra -Wpedantic t.C
namespace N {
enum { i };
}
int g ()
{
constexpr int j = ({ using namespace N; i; });
return j;
}
t.C: In function ‘int g()’:
t.C:7:21: warning: ISO C++ forbids braced-groups within expressions
[-Wpedantic]
constexpr int j = ({ using namespace N; i; });
^
t.C:7:40: error: statement is not a constant expression
constexpr int j = ({ using namespace N; i; });
^
