问题描述
#include <stddef.h>
#include <stdio.h>
#include <algorithm>
#include <chrono>
#include <execution>
#include <random>
#include <ratio>
#include <vector>
当我使用 Clang/Linux 构建它时，我收到这些链接器错误，这似乎暗示我正在使用 TBB 库（我不是）：
[1/2] /usr/bin/clang++ -IAlgosGPGPU.p -I. -I../AlgosGPGPU -fcolor-diagnostics -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wnon-virtual-dtor -std=c++20 -g -MD -MQ AlgosGPGPU.p/main.cpp.o -MF AlgosGPGPU.p/main.cpp.o.d -o AlgosGPGPU.p/main.cpp.o -c ../AlgosGPGPU/main.cpp
[2/2] /usr/bin/clang++ -o AlgosGPGPU AlgosGPGPU.p/main.cpp.o -Wl,--as-needed -Wl,--no-undefined
Failed: AlgosGPGPU
/usr/bin/clang++ -o AlgosGPGPU AlgosGPGPU.p/main.cpp.o -Wl,--no-undefined
/usr/bin/ld: AlgosGPGPU.p/main.cpp.o: in function `void tbb::interface7::internal::isolate_impl<void,__pstl::__tbb_backend::__parallel_stable_sort<__pstl::execution::v1::parallel_unsequenced_policy const&,__gnu_cxx::__normal_iterator<double*,std::vector<double,std::allocator<double> > >,std::less<double>,__pstl::__internal::__pattern_sort<__pstl::execution::v1::parallel_unsequenced_policy const&,std::integral_constant<bool,true> >(__pstl::execution::v1::parallel_unsequenced_policy const&,true>,true>)::{lambda()#1}::operator()() const::{lambda(__gnu_cxx::__normal_iterator<double*,std::less<double>)#1}>(__pstl::execution::v1::parallel_unsequenced_policy const&,std::less<double>)#1},unsigned long)::{lambda()#1} const>(__pstl::__tbb_backend::__parallel_stable_sort<__pstl::execution::v1::parallel_unsequenced_policy const&,unsigned long)::{lambda()#1} const&)':
/usr/include/tbb/task_arena.h:216: undefined reference to `tbb::interface7::internal::isolate_within_arena(tbb::interface7::internal::delegate_base&,long)'
/usr/bin/ld: AlgosGPGPU.p/main.cpp.o: in function `tbb::tbb_allocator<double>::allocate(unsigned long,void const*)':
/usr/include/tbb/tbb_allocator.h:86: undefined reference to `tbb::internal::allocate_via_handler_v3(unsigned long)'
/usr/bin/ld: AlgosGPGPU.p/main.cpp.o: in function `operator new(unsigned long,tbb::internal::allocate_root_proxy const&)':
/usr/include/tbb/task.h:1145: undefined reference to `tbb::internal::allocate_root_proxy::allocate(unsigned long)'
/usr/bin/ld: AlgosGPGPU.p/main.cpp.o: in function `operator delete(void*,tbb::internal::allocate_root_proxy const&)':
/usr/include/tbb/task.h:1149: undefined reference to `tbb::internal::allocate_root_proxy::free(tbb::task&)'
/usr/bin/ld: AlgosGPGPU.p/main.cpp.o: in function `task':
/usr/include/tbb/task.h:625: undefined reference to `vtable for tbb::task'
/usr/bin/ld: AlgosGPGPU.p/main.cpp.o: in function `operator new(unsigned long,tbb::internal::allocate_continuation_proxy const&)':
/usr/include/tbb/task.h:1163: undefined reference to `tbb::internal::allocate_continuation_proxy::allocate(unsigned long) const'
/usr/bin/ld: AlgosGPGPU.p/main.cpp.o: in function `operator delete(void*,tbb::internal::allocate_continuation_proxy const&)':
/usr/include/tbb/task.h:1167: undefined reference to `tbb::internal::allocate_continuation_proxy::free(tbb::task&) const'
...
如果我注释掉这行代码：
sort(std::execution::par_unseq,sorted.begin(),sorted.end());
程序构建成功。
这是怎么回事？ clang 在下面使用 TBB 吗？
解决方法
我相信大多数 Linux 发行版上的 clang 都与 GNU libstdc++ 相关联，后者的 const serverResponse = await fetch('https://<MYAPP>.auth0.com/api/v2/users/' + user.sub,{
headers:{
Authorization: 'Bearer ' + accessToken
}
})
支持确实需要 libtbb。这埋在the documentation中，搜索“Note 3”。因此，您必须安装 libtbb 并将 <execution> 添加到您的链接命令中。