G++ & Clang++ - namespace std _GLIBCXX_VISIBILITY(默认)

G++ & Clang++ - namespace std _GLIBCXX_VISIBILITY(default)

本文关键字：GLIBCXX VISIBILITY 默认 std Clang++ namespace G++      更新时间：2023-10-16

我正在尝试使用clang++编译我的C++代码，但不断收到此错误与冲突的命名空间。我的主文件.cpp是一个简单的Hello World程序（用于调试）。

我有一种感觉，问题出在我在集群上编译的 GCC 或 clang 版本上。关于如何追踪这个问题的任何想法？还是故障排除步骤？

[aebrenne@hpc src]$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/data/apps/gcc/4.8.1/libexec/gcc/x86_64-unknown-linux-gnu/4.8.1/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --with-gmp=/data/apps/gmp/5.1.2 --with-mpfr=/data/apps/mpfr/3.1.2 --with-mpc=/data/apps/mpc-1.0.1 --enable-threads=posix --with-as=/data/apps/binutils/2.23.2/bin/as --mandir=/data/apps/gcc/4.8.1/man --pdfdir=/data/apps/gcc/4.8.1/pdf --htmldir=/data/apps/gcc/4.8.1/html --enable-languages=c,c++,fortran,ada,go,java,lto,objc,obj-c++ --prefix=/data/apps/gcc/4.8.1
Thread model: posix
gcc version 4.8.1 (GCC) 
[aebrenne@hpc src]$ clang++ --version
clang version 3.4 (trunk 193367)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[aebrenne@hpc src]$ 

[aebrenne@hpc src]$ cat main.cpp 
#include <iostream>
int main() {
    std::cout << "Starting test..." << std::endl;
    return 0;
}
[aebrenne@hpc src]$ clang++ -std=c++11 -Wall -g -I/data/apps/gcc/4.8.1/include/c++/4.8.1  main.cpp 
In file included from main.cpp:1:
In file included from /data/apps/gcc/4.8.1/include/c++/4.8.1/iostream:39:
In file included from /data/apps/gcc/4.8.1/include/c++/4.8.1/ostream:38:
In file included from /data/apps/gcc/4.8.1/include/c++/4.8.1/ios:38:
In file included from /data/apps/gcc/4.8.1/include/c++/4.8.1/iosfwd:39:
In file included from /data/apps/gcc/4.8.1/include/c++/4.8.1/bits/stringfwd.h:40:
/data/apps/gcc/4.8.1/include/c++/4.8.1/bits/memoryfwd.h:50:15: error: expected '{'
namespace std _GLIBCXX_VISIBILITY(default)
              ^
/data/apps/gcc/4.8.1/include/c++/4.8.1/bits/memoryfwd.h:50:15: error: C++ requires a type specifier for all declarations
namespace std _GLIBCXX_VISIBILITY(default)
              ^~~~~~~~~~~~~~~~~~~
/data/apps/gcc/4.8.1/include/c++/4.8.1/bits/memoryfwd.h:50:35: error: expected expression
namespace std _GLIBCXX_VISIBILITY(default)
                                  ^
/data/apps/gcc/4.8.1/include/c++/4.8.1/bits/memoryfwd.h:50:43: error: expected ';' after top level declarator
namespace std _GLIBCXX_VISIBILITY(default)
                                          ^

因为这是搜索的第一个结果：

error: expected unqualified-id before 'namespace'
namespace std _GLIBCXX_VISIBILITY(default)

我承认，我之所以出现此错误，是因为在回溯中提到的头文件中缺少一个右大括号。

希望这对某人有所帮助。

我遇到了同样的问题。

问题是我只有以下内容作为CPATH：

<gcc-install-path>/include/c++/<gcc-version>
在同一

目录中grep ing _GLIBCXX_VISIBILITY后，宏似乎是在特定于主机的子目录中定义的。就我而言，这x86_64-unknown-linux-gnu.将其添加到CPATH解决了问题。我的新CPATH是：

<gcc-install-path>/include/c++/<gcc-version>:<gcc-install-path>/include/c++/<gcc-version>/<machine-specific-headers>

对于我的示例机器，这转化为：

export CPATH=~/f/i/gcc-4.8.4/include/c++/4.8.4:~/f/i/gcc-4.8.4/include/c++/4.8.4/x86_64-unknown-linux-gnu

我希望这对某人有所帮助。

我正在使用 clang++ 4.2，它对我有用，奇怪

clang++ -std=c++11 -Wall -g main.cpp
如果你只是摆脱了 -I/data/apps/gcc/4.8.1/

include/c++/4.8.1

怎么办

默认情况下它不起作用吗？

对于 GCC 定义函数的属性主题、命名空间传递的参数类型、调用协议等。宏_GLIBCXX_VISIBILITY（默认）是属性（visibility_（默认））的重新定义，在Windows中未定义...在 Linux 中已开启！至于另一个OC，我不知道。必须将此宏重新定义为空，并在所有包含之前设置它们。等等，发生错误。但很奇怪...如果设置面向 STL 平台，则必须进行适当的重新定义!!您需要手动使用它。至于我，我喜欢属性。它们允许控制任何编译器和受让人正确行为都不可用的某些方面。例如，根据格式在函数 printf 中传递的变量类型和变量数。如果您传递了不同类型的或没有足够的数字参数错误，则错误将作为编译错误发生!!没有别的能给人这样的机会!!在 Linux 上使用属性。这是个好主意...

我遇到了同样的问题。

我混淆了 gcc 4.8 标头和系统标头（较低版本，gcc 4.4.6，_GLIBCXX_VISIBILITY未定义）。

用：

clang++ -std=c++11 -Wall -g -I/data/apps/gcc/4.8.1/include/c++/4.8.1  main.cpp -v -H

以查看所有"包含"详细信息。

就我而言：

. /include/c++/4.8.2/iostream
.. /usr/lib64/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/x86_64-redhat-linux/bits/c++config.h
... /include/bits/wordsize.h
... /usr/lib64/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/x86_64-redhat-linux/bits/os_defines.h
.... /include/features.h
..... /include/stdc-predef.h
..... /include/sys/cdefs.h
...... /include/bits/wordsize.h
..... /include/gnu/stubs.h
...... /include/gnu/stubs-64.h
... /usr/lib64/gcc/x86_64-redhat-linux/4.4.6/../../../../include/c++/4.4.6/x86_64-redhat-linux/bits/cpu_defines.h
.. /include/c++/4.8.2/ostream
... /include/c++/4.8.2/ios
.... /include/c++/4.8.2/iosfwd
..... /include/c++/4.8.2/bits/stringfwd.h
...... /include/c++/4.8.2/bits/memoryfwd.h
In file included from test.cpp:1:
In file included from /include/c++/4.8.2/iostream:39:
In file included from /include/c++/4.8.2/ostream:38:
In file included from /include/c++/4.8.2/ios:38:
In file included from /include/c++/4.8.2/iosfwd:39:
In file included from /include/c++/4.8.2/bits/stringfwd.h:40:
/include/c++/4.8.2/bits/memoryfwd.h:50:15: error: expected '{'
namespace std _GLIBCXX_VISIBILITY(default)

修复了这个：

clang++ -std=c++11 -isystem /include/c++/4.8.2/ -isystem /include/c++/4.8.2/x86_64-baidu-linux-gnu/ test.cpp -v -H

为此，_GLIBCXX_VISIBILITY在/include/c++/4.8.2/x86_64-baidu-linux-gnu/bits/c++_config.h 中定义

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