How to Check the Version of my gcc? - c++

Question

In file included from /usr/include/c++/4.8.2/locale:41:0,
from /usr/include/c++/4.8.2/iomanip:43,
from [...omitted by myself as it is irrelevant]
/usr/include/c++/4.8.2/bits/locale_facets_nonio.h:59:39: error: ‘locale’ has not been declared
struct __timepunct_cache : public locale::facet
Above is the first error in my build log.
I didn't try to compile glibc/gcc myself, and I installed them via yum.
One fishy thing I found is:
$ ll /usr/include/c++/
total 4
drwxr-xr-x. 12 root root 4096 Dec 17 14:16 4.8.2
lrwxrwxrwx 1 root root 5 Dec 17 14:16 4.8.5 -> 4.8.2
$
And yum showed only 1 version of gcc:
$ yum info gcc-c++
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: centos.uhost.hk
* epel: mirrors.hustunique.com
* extras: centos.uhost.hk
* updates: centos.uhost.hk
Installed Packages
Name : gcc-c++
Arch : x86_64
Version : 4.8.5
Release : 4.el7
Size : 16 M
Repo : installed
From repo : base
Summary : C++ support for GCC
URL : http://gcc.gnu.org
License : GPLv3+ and GPLv3+ with exceptions and GPLv2+ with exceptions and LGPLv2+ and BSD
Description : This package adds C++ support to the GNU Compiler Collection.
: It includes support for most of the current C++ specification,
: including templates and exception handling.
Any idea how to verify the headers in /usr/include/c++/4.8.2 is indeed from 4.8.5 package?
Thanks in advance.
P.S. I think probably glibc is irrelevant but here is the info:
$ ldd --version
ldd (GNU libc) 2.17
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.

Answer 1

The symlink to the 4.8.2 directory is nothing to worry about, it's normal for the libstdc++ headers on Red Hat Enterprise Linux (and therefore CentOS) to be arranged like that.
gcc --version will tell you the version of the gcc executable in your path.
rpm -q libstdc++-devel will tell you the version of the package that owns the C++ standard library headers.
rpm -ql libstdc++-devel will list the files installed by that package, which will include the files under /usr/include/c++/4.8.2
rpm --verify libstdc++-devel will check that you haven't messed up the C++ headers by replacing them with something else.
The error is more concerning, that implies you have messed something up. My guess would be it's in the from [...omitted by myself as it is irrelevant] part, which may actually be very relevant. std::locale should be declared in <bits/locale_classes.h> which is included before <bits/locale_facets_nonio.h>, so if it wasn't declared my guess is that you have some header that defines _LOCALE_CLASSES_H and prevents the standard library header from being read. Do not define include guards that start with underscores, they are reserved names.

Answer 2

I am not quite sure but below is more information
Stackoverflow: version of libc
$ /lib/x86_64-linux-gnu/libc.so.6
GNU C Library (Ubuntu EGLIBC 2.19-0ubuntu6) stable release version 2.19, by Roland McGrath et al.
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.8.2.
Compiled on a Linux 3.13.9 system on 2014-04-12.
Available extensions:
crypt add-on version 2.1 by Michael Glad and others
GNU Libidn by Simon Josefsson
Native POSIX Threads Library by Ulrich Drepper et al
BIND-8.2.3-T5B
libc ABIs: UNIQUE IFUNC
For bug reporting instructions, please see:
<https://bugs.launchpad.net/ubuntu/+source/eglibc/+bugs>.
mandar#ubuntu:~/Desktop$

Answer 3

Since you are using Linux you can try
ldd --version