C++ 尚未声明 NetBSD '::system' 上的编译错误

C++ Compile error on NetBSD '::system' has not been declared

本文关键字:编译 错误 system 未声明 C++ NetBSD      更新时间:2023-10-16

我有一些C++代码在Linux上编译得很好,但到目前为止,我无法让它在NetBSD上正确编译。

这些是我的包括:

#include <fstream>
#include <iostream>
#include <cstdlib>
#include <unistd.h>
#include <iomanip>
#include <boost/regex.hpp>

我用这个命令编译:

g++ -v -O2 -fno-strict-aliasing -I /usr/pkg/include 
barefoot.cpp -o barefoot -L /usr/pkg/lib/ -lboost_regex 
-L /usr/pkg/lib/ -lboost_regex -lpthreads

呈现此输出:

Using built-in specs.
COLLECT_GCC=g++
Target: x86_64--netbsd
Configured with: /usr/src2/tools/gcc/../../external/gpl3/gcc/dist/configure --target=x86_64--netbsd --enable-long-long --enable-threads --with-bugurl=http://www.NetBSD.org/Misc/send-pr.html --with-pkgversion='NetBSD nb2 20111202' --enable-__cxa_atexit --with-tune=nocona --with-mpc=/var/obj/mknative/amd64/usr/src2/destdir.amd64/usr --with-mpfr=/var/obj/mknative/amd64/usr/src2/destdir.amd64/usr --with-gmp=/var/obj/mknative/amd64/usr/src2/destdir.amd64/usr --enable-tls --disable-multilib --disable-symvers --disable-libstdcxx-pch --build=x86_64-unknown-netbsd5.99.56 --host=x86_64--netbsd
Thread model: posix
gcc version 4.5.3 (NetBSD nb2 20110806) 
COLLECT_GCC_OPTIONS='-v' '-O2' '-fno-strict-aliasing' '-I' '/usr/pkg/include/' '-o' 'a.out' '-L' '/usr/pkg/lib/' '-mtune=nocona' '-march=x86-64'
 /usr/libexec/cc1plus -quiet -v -I /usr/pkg/include/ barefoot.cpp -quiet -dumpbase barefoot.cpp -mtune=nocona -march=x86-64 -auxbase barefoot -O2 -version -fno-strict-aliasing -o /var/tmp//cc9Dcmwi.s
GNU C++ (NetBSD nb2 20110806) version 4.5.3 (x86_64--netbsd)
        compiled by GNU C version 4.5.3, GMP version 5.0.2, MPFR version 3.0.1-p4, MPC version 0.9
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=131007
#include "..." search starts here:
#include <...> search starts here:
 /usr/pkg/include/
 /usr/include/g++
 /usr/include/g++/backward
 /usr/include/gcc-4.5
 /usr/include
End of search list.
GNU C++ (NetBSD nb2 20110806) version 4.5.3 (x86_64--netbsd)
        compiled by GNU C version 4.5.3, GMP version 5.0.2, MPFR version 3.0.1-p4, MPC version 0.9
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=131007
Compiler executable checksum: a34e7d170f4dd8d4687d2b62e8dca4b7
In file included from /usr/include/g++/bits/gthr.h:166:0,
                 from /usr/include/g++/ext/atomicity.h:34,
                 from /usr/include/g++/bits/ios_base.h:41,
                 from /usr/include/g++/ios:43,
                 from /usr/include/g++/istream:40,
                 from /usr/include/g++/fstream:40,
                 from barefoot.cpp:29:
/usr/include/g++/bits/gthr-default.h:130:9: error: 'pthread_detach' was not declared in this scope
/usr/include/g++/bits/gthr-default.h:130:1: error: invalid type in declaration before ';' token
/usr/include/g++/bits/gthr-default.h: In function 'int __gthread_detach(pthread_st*)':
/usr/include/g++/bits/gthr-default.h:668:46: error: '__gthrw_pthread_detach' cannot be used as a function
In file included from /usr/pkg/include/boost/regex/v4/regex_workaround.hpp:25:0,
                 from /usr/pkg/include/boost/regex/v4/regex.hpp:32,
                 from /usr/pkg/include/boost/regex.hpp:31,
                 from barefoot.cpp:32:
/usr/include/g++/cstdlib: At global scope:
/usr/include/g++/cstdlib:132:11: error: '::system' has not been declared

我尝试添加-lpthread,但这导致了相同的输出。不知道接下来要尝试什么。

我不知道你为什么面临这个问题,但我可以为你提供一些后续步骤来尝试。

  • 请注意,第一个错误是缺少pthread_detach。系统头文件通常会确保包含它们所需的任何头文件,但您可以尝试在所有其他头文件上方添加<pthread.h>

  • 如果失败,您需要找出由于添加#include <pthread.h>而包含哪个文件,并确保其中存在pthread_detach(它确实应该在某个地方)。

  • 假设它在那里,一定有一些条件编译导致它对你的源代码不可见。查找条件保护,以及哪些宏值会影响它。

  • 然后,您需要了解为什么您的系统以导致函数pthread_detach不可见的方式定义宏值。

通过此调查,您可能会发现您没有包含正确的<pthread.h>文件。这可能是由于系统包含目录与要使用的包含目录冲突。

这个问题的这个答案(它位于底部)显示了如何显示g++编译器的预定义宏。