如何解决函数的简单生成为 std::thread
同志们!
为了检查 gcc 将生成的代码,我正在尝试做一些多线程的事情。简化的测试用例在这里:
#include <iostream>
#include <thread>
int n;
void embiggen(void) { ++n; }
void foo(void)
{
std::thread t1(embiggen);
t1.join();
std::cout << "n = " << n << '\n';
};
当然,这会导致此失败:
/xtools/aarch64-unkNown-elf/bin/aarch64-unkNown-elf-g++ -ggdb3 -std=c++11 -Wall -Wextra -Wno-unused-parameter -O0 -lpthread -march=armv8.1-a foo.cc -c foo.o;
foo.cc: In function 'void foo()':
foo.cc:9:26: error: no matching function for call to 'std::thread::thread(void (&)())'
9 | std::thread t1(embiggen);
| ^
/xtools/aarch64-unkNown-elf/aarch64-unkNown-elf/include/c++/11.1.0/bits/std_thread.h:157:5: note: candidate: 'std::thread::thread(std::thread&&)'
157 | thread(thread&& __t) noexcept
| ^~~~~~
/xtools/aarch64-unkNown-elf/aarch64-unkNown-elf/include/c++/11.1.0/bits/std_thread.h:157:21: note: no kNown conversion for argument 1 from 'void()' to 'std::thread&&'
157 | thread(thread&& __t) noexcept
| ~~~~~~~~~^~~
/xtools/aarch64-unkNown-elf/aarch64-unkNown-elf/include/c++/11.1.0/bits/std_thread.h:121:5: note: candidate: 'std::thread::thread()'
121 | thread() noexcept = default;
| ^~~~~~
/xtools/aarch64-unkNown-elf/aarch64-unkNown-elf/include/c++/11.1.0/bits/std_thread.h:121:5: note: candidate expects 0 arguments,1 provided
我相信我已经尝试过像 this 和 this 这样的代码,但无济于事。
编辑:我正在使用 gcc-11.1.0
。
EDIT2:我的编译器是由 crosstool-ng
和 CT_THREADS="none"
创建的。我认为这是这里的杀手...
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