我无法让scons正确编译一个小的线程示例(在Linux上)。
如果我运行scons,它会这样做:
jarrett@jarrett-laptop:~/projects/c++_threads$ scons
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
g++ -o build/main.o -c -std=c++11 -pthread -Wall -g src/main.cpp
g++ -o build/c++threads build/main.o
scons: done building targets.
然后,如果我运行./build/c++threads
,则会抛出此错误:
terminate called after throwing an instance of 'std::system_error'
what(): Operation not permitted
Aborted
如果我从命令行编译:
g++ -std=c++11 -pthread -Wall -g src/main.cpp
它编译为a.out
,如果我运行a.out
它运行程序(为线程做一些输出等)。
这是我的SConstruct文件:
# Tell SCons to create our build files in the 'build' directory
VariantDir('build', 'src', duplicate=0)
# Set our source files
source_files = Glob('build/*.cpp', 'build/*.h')
# Set our required libraries
libraries = []
library_paths = ''
env = Environment()
# Set our g++ compiler flags
env.Append( CPPFLAGS=['-std=c++11', '-pthread', '-Wall', '-g'] )
# Tell SCons the program to build
env.Program('build/c++threads', source_files, LIBS = libraries, LIBPATH = library_paths)
这是cpp文件:
#include <iostream>
#include <thread>
#include <vector>
//This function will be called from a thread
void func(int tid) {
std::cout << "Launched by thread " << tid << std::endl;
}
int main() {
std::vector<std::thread> th;
int nr_threads = 10;
//Launch a group of threads
for (int i = 0; i < nr_threads; ++i) {
th.push_back(std::thread(func,i));
}
//Join the threads with the main thread
for(auto &t : th){
t.join();
}
return 0;
}
任何人都知道我做错了什么???
感谢任何帮助!
干杯
Jarrett的
答案 0 :(得分:5)
感谢@Joachim和@bamboon的评论。将pthread添加到链接器(scons库)标志有效。
新的scons文件现在是:
# Tell SCons to create our build files in the 'build' directory
VariantDir('build', 'src', duplicate=0)
# Set our source files
source_files = Glob('build/*.cpp', 'build/*.h')
# Set our required libraries
libraries = ['pthread']
library_paths = ''
env = Environment()
# Set our g++ compiler flags
env.Append( CPPFLAGS=['-std=c++11', '-pthread', '-Wall', '-g'] )
# Tell SCons the program to build
env.Program('build/c++threads', source_files, LIBS = libraries, LIBPATH = library_paths)
再次感谢!