https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79243
Bug ID: 79243
Summary: [7 Regression] Ambiguity with <string_view> and
versioned namespaces
Product: gcc
Version: 7.0.1
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
The following no longer compiles in C++17 mode:
#include <string>
int main()
{
using namespace std::literals;
}
d.cc: In function ‘int main()’:
d.cc:5:24: error: reference to ‘literals’ is ambiguous
using namespace std::literals;
^~~~~~~~
In file included from /home/jwakely/gcc/so7/include/c++/7.0.1/string:38:0,
from d.cc:1:
/home/jwakely/gcc/so7/include/c++/7.0.1/x86_64-pc-linux-gnu/bits/c++config.h:290:20:
note: candidates are: namespace std::literals { }
inline namespace literals {
^~~~~~~~
In file included from
/home/jwakely/gcc/so7/include/c++/7.0.1/bits/basic_string.h:48:0,
from /home/jwakely/gcc/so7/include/c++/7.0.1/string:52,
from d.cc:1:
/home/jwakely/gcc/so7/include/c++/7.0.1/string_view:638:20: note:
namespace std::__7::literals { }
inline namespace literals
^~~~~~~~
d.cc:5:24: error: ‘literals’ is not a namespace-name
using namespace std::literals;
^~~~~~~~
d.cc:5:32: error: expected namespace-name before ‘;’ token
using namespace std::literals;
^
