[结贴]linux gcc使用C++11的thread库，只有几行程序，出运行时错误!

iwqueri

我在ubuntu13.10上面用apt-get安装了gcc4.8.1，尝试下面的小程序:

1. 
   
2. #include <thread>
   
3. #include <iostream>
   
4. #include <stdio.h>
   
5. using namespace std;
   
6. void f()
   
7. {
   
8. }
   
9. int main(int argc, char* argv[])
   
10. {
    
11.       thread t(f);
    
12.       t.join();
    
13.       return 0;
    
14. }
    

复制代码

编译运行，出错:
$ g++ a.cpp -std=c++11  -lpthread && ./a.out
terminate called after throwing an instance of 'std::system_error'
  what():  Enable multithreading to use std::thread: Operation not permitted
Aborted (core dumped)
------------------------------------------
这是为什么呢? 错误在哪里? 版本信息如下:
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.8.1-10ubuntu9' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu9)

weishuo1999

试一下这个
g++ a.cpp -std=c++11  -pthread && ./a.out

iwqueri

weishuo1999 发表于 2014-03-06 13:36
试一下这个
g++ a.cpp -std=c++11  -pthread && ./a.out

也还是不行:

$ g++ a.cpp -std=c++11 -pthread && ./a.out
terminate called after throwing an instance of 'std::system_error'
  what():  Enable multithreading to use std::thread: Operation not permitted
Aborted (core dumped)

这到底是个什么错误?

iwqueri

找到答案了！

http://stackoverflow.com/questio ... ation-not-permitted

gcc4.6以后对于ld自动加上了as-needed选项。所以编译选项应该变成:
g++ -Wl,--no-as-needed -std=c++11 -pthread a.cpp
这样就没有问题了！