https://llvm.org/bugs/show_bug.cgi?id=30277
Bug ID: 30277
Summary: Clang 3.6 cannot compile program with -std=c++14
Product: clang
Version: 3.6
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++14
Assignee: unassignedclangb...@nondot.org
Reporter: noloa...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
I'm working on Ubuntu 14.0.5 LTS. Ubuntu provides GCC 4.8 and Clang 3.6.
Clang 3.6 provided by Ubuntu claims to support C++14. -std=c++14 is not
rejected by the compiler during feature testing. The feature test program
includes the C++ header <iosfwd>.
Attempting to compile a test program:
$ cat test.cxx
#include <string>
int main(int argc, char* argv[])
{
return 0;
}
Results in the following:
$ clang++ -std=c++14 test.cxx -o test.exe
In file included from test.cxx:1:
In file included from
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/string:52:
In file included from
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/basic_string.h:2815:
In file included from
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/ext/string_conversions.h:43:
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/cstdio:120:11:
error:
no member named 'gets' in the global namespace
using ::gets;
~~^
1 error generated.
**********
Ubuntu Issue at "Clang 3.6 cannot compile program with -std=c++14",
http://bugs.launchpad.net/ubuntu/+bug/1620181 .
According to http://stackoverflow.com/q/17775390/608639, this issue is present
as early as Clang 3.3.
An interesting answer from a similar error report on Stack Overflow reveals
this (http://stackoverflow.com/a/17776548/608639):
<BEGIN SNIP>
This note in the gets manpage looks relevant:
ISO C11 removes the specification of gets() from the C language, and since
version 2.16, glibc header files don't expose the function declaration if the
_ISOC11_SOURCE feature test macro is defined.
Probably should be:
#if !_ISOC11_SOURCE
using ::gets;
#endif
<END SNIP>
**********
$ clang++ -v
Ubuntu clang version 3.6.0-2ubuntu1~trusty1 (tags/RELEASE_360/final) (based on
LLVM 3.6.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
Release: 14.04
Codename: trusty
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