C++ 如何检查我的 gcc 的版本？
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How to Check the Version of my gcc?
提问by Hei
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.
以上是我的构建日志中的第一个错误。
I didn't try to compile glibc/gcc myself, and I installed them via yum.
我没有尝试自己编译 glibc/gcc，我是通过 yum 安装的。
One fishy thing I found is:
我发现的一件可疑的事情是：
$ 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 只显示了 1 个版本的 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?
知道如何验证 /usr/include/c++/4.8.2 中的头文件确实来自 4.8.5 包吗？
Thanks in advance.
提前致谢。
P.S. I think probably glibc is irrelevant but here is the info:
PS 我认为 glibc 可能无关紧要，但这里是信息：
$ 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.
回答by Jonathan Wakely
The symlink to the 4.8.2directory 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.
4.8.2目录的符号链接没有什么可担心的，Red Hat Enterprise Linux（以及 CentOS）上的 libstdc++ 标头这样排列是正常的。
gcc --versionwill tell you the version of the gccexecutable in your path.
gcc --version会告诉gcc您路径中可执行文件的版本。
rpm -q libstdc++-develwill tell you the version of the package that owns the C++ standard library headers.
rpm -q libstdc++-devel会告诉您拥有 C++ 标准库头文件的包的版本。
rpm -ql libstdc++-develwill list the files installed by that package, which will include the files under /usr/include/c++/4.8.2
rpm -ql libstdc++-devel将列出该软件包安装的文件，其中将包括以下文件 /usr/include/c++/4.8.2
rpm --verify libstdc++-develwill check that you haven't messed up the C++ headers by replacing them with something else.
rpm --verify libstdc++-devel将通过用其他东西替换它们来检查您是否没有弄乱 C++ 头文件。
The error is more concerning, that implies you have messed somethingup. My guess would be it's in the from [...omitted by myself as it is irrelevant]part, which may actually be very relevant. std::localeshould 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_Hand prevents the standard library header from being read. Do notdefine include guards that start with underscores, they are reserved names.
这个错误更令人担忧，这意味着你把事情搞砸了。我的猜测是它在from [...omitted by myself as it is irrelevant]部分中，这实际上可能非常相关。std::locale应该声明在<bits/locale_classes.h>which is included before <bits/locale_facets_nonio.h>，所以如果它没有声明，我的猜测是你有一些头文件定义_LOCALE_CLASSES_H并防止标准库头文件被读取。千万不能定义包括用下划线开始卫士，他们是保留名称。
回答by Mandar
I am not quite sure but below is more information
我不太确定，但以下是更多信息
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$
回答by kiran
Since you are using Linux you can try
由于您使用的是Linux，您可以尝试
ldd --version
