http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53895
Bug #: 53895
Summary: [4.7.2/4.8 Regression][lto] symbol
'std::__once_callable' used as both __thread and
non-__thread
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
AssignedTo: [email protected]
ReportedBy: [email protected]
I'm sure was working with 4.7.1
works with gcc version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC)
this is ok
c++ thread.cpp -pthread -std=gnu++0x -O2
this is not
c++ thread.cpp -pthread -std=gnu++0x -O2 -flto
/afs/cern.ch/user/i/innocent/w3/gcc47slc5/bin/ld: error:
/afs/cern.ch/user/i/innocent/w3/gcc47slc5/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib64/libstdc++.so:
symbol 'std::__once_call' used as both __thread and non-__thread
/afs/cern.ch/user/i/innocent/w3/gcc47slc5/bin/ld: /tmp/innocent/ccd0XlxC.o:
previous definition here
/afs/cern.ch/user/i/innocent/w3/gcc47slc5/bin/ld: error:
/afs/cern.ch/user/i/innocent/w3/gcc47slc5/lib/gcc/x86_64-unknown-linux-gnu/4.7.2/../../../../lib64/libstdc++.so:
symbol 'std::__once_callable' used as both __thread and non-__thread
/afs/cern.ch/user/i/innocent/w3/gcc47slc5/bin/ld: /tmp/innocent/ccd0XlxC.o:
previous definition here
collect2: error: ld returned 1 exit status
ld -v
GNU gold (GNU Binutils 2.22.52.20120515) 1.11
gcc version 4.7.2 20120629 (prerelease) [gcc-4_7-branch revision 189081] (GCC)
gcc version 4.8.0 20120623 (experimental) [trunk revision 188906] (GCC)
gcc version 4.8.0 20120708 (experimental) [trunk revision 189362] (GCC)
cat thread.cpp
include <iostream>
#include <sstream>
#include <vector>
#include <thread>
#include <mutex>
#include <future>
#include <atomic>
#include <functional>
#include <algorithm>
typedef std::thread Thread;
typedef std::vector<std::thread> ThreadGroup;
typedef std::mutex Mutex;
typedef std::unique_lock<std::mutex> Guard;
typedef std::condition_variable Condition;
long long threadId() {
std::stringstream ss;
ss << std::this_thread::get_id();
long long id;
ss >> id;
return id;
}
namespace global {
// control cout....
Mutex coutLock;
}
int main() {
return 0;
}
