when i make caffe，it occurs.

[chanyixialex]

CXX src/caffe/util/db_leveldb.cpp
CXX src/caffe/util/db.cpp
CXX src/caffe/util/upgrade_proto.cpp
CXX src/caffe/util/insert_splits.cpp
CXX src/caffe/util/hdf5.cpp
CXX src/caffe/util/signal_handler.cpp
CXX src/caffe/util/im2col.cpp
CXX src/caffe/util/db_lmdb.cpp
In file included from /home/alex/usr/local/include/leveldb/iterator.h:20:0,
from /home/alex/usr/local/include/leveldb/db.h:11,
from ./include/caffe/util/db_leveldb.hpp:7,
from src/caffe/util/db_leveldb.cpp:2:
/home/alex/usr/local/include/leveldb/status.h:26:10: error: expected ‘;’ at end of member declaration
Status() noexcept : state_(nullptr) { }
^
/home/alex/usr/local/include/leveldb/status.h:26:12: error: ‘noexcept’ does not name a type
Status() noexcept : state_(nullptr) { }
^
/home/alex/usr/local/include/leveldb/status.h:26:12: note: C++11 ‘noexcept’ only available with -std=c++11 or -std=gnu++11
/home/alex/usr/local/include/leveldb/status.h:32:16: error: expected ‘,’ or ‘...’ before ‘&&’ token
Status(Status&& rhs) noexcept : state_(rhs.state_) { rhs.state_ = nullptr; }
^
/home/alex/usr/local/include/leveldb/status.h:32:22: error: invalid constructor; you probably meant ‘leveldb::Status (const leveldb::Status&)’
Status(Status&& rhs) noexcept : state_(rhs.state_) { rhs.state_ = nullptr; }
^
/home/alex/usr/local/include/leveldb/status.h:32:22: error: expected ‘;’ at end of member declaration
/home/alex/usr/local/include/leveldb/status.h:32:24: error: ‘noexcept’ does not name a type
Status(Status&& rhs) noexcept : state_(rhs.state_) { rhs.state_ = nullptr; }
^
/home/alex/usr/local/include/leveldb/status.h:32:24: note: C++11 ‘noexcept’ only available with -std=c++11 or -std=gnu++11
/home/alex/usr/local/include/leveldb/status.h:33:27: error: expected ‘,’ or ‘...’ before ‘&&’ token
Status& operator=(Status&& rhs) noexcept;
^
/home/alex/usr/local/include/leveldb/status.h:33:33: error: expected ‘;’ at end of member declaration
Status& operator=(Status&& rhs) noexcept;
^
/home/alex/usr/local/include/leveldb/status.h:33:35: error: ‘noexcept’ does not name a type
Status& operator=(Status&& rhs) noexcept;
^
/home/alex/usr/local/include/leveldb/status.h:33:35: note: C++11 ‘noexcept’ only available with -std=c++11 or -std=gnu++11
/home/alex/usr/local/include/leveldb/status.h: In member function ‘bool leveldb::Status::ok() const’:
/home/alex/usr/local/include/leveldb/status.h:56:39: error: ‘nullptr’ was not declared in this scope
bool ok() const { return (state_ == nullptr); }
^
/home/alex/usr/local/include/leveldb/status.h: In member function ‘leveldb::Status::Code leveldb::Status::code() const’:
/home/alex/usr/local/include/leveldb/status.h:95:23: error: ‘nullptr’ was not declared in this scope
return (state_ == nullptr) ? kOk : static_cast(state_[4]);
^
/home/alex/usr/local/include/leveldb/status.h: In copy constructor ‘leveldb::Status::Status(const leveldb::Status&)’:
/home/alex/usr/local/include/leveldb/status.h:103:27: error: ‘nullptr’ was not declared in this scope
state_ = (rhs.state_ == nullptr) ? nullptr : CopyState(rhs.state_);
^
/home/alex/usr/local/include/leveldb/status.h: In member function ‘leveldb::Status& leveldb::Status::operator=(const leveldb::Status&)’:
/home/alex/usr/local/include/leveldb/status.h:110:29: error: ‘nullptr’ was not declared in this scope
state_ = (rhs.state_ == nullptr) ? nullptr : CopyState(rhs.state_);
^
/home/alex/usr/local/include/leveldb/status.h: At global scope:
/home/alex/usr/local/include/leveldb/status.h:114:40: error: expected ‘,’ or ‘...’ before ‘&&’ token
inline Status& Status::operator=(Status&& rhs) noexcept {
^
/home/alex/usr/local/include/leveldb/status.h:114:48: error: expected initializer before ‘noexcept’
inline Status& Status::operator=(Status&& rhs) noexcept {
^
In file included from /home/alex/usr/local/include/leveldb/db.h:11:0,
from ./include/caffe/util/db_leveldb.hpp:7,
from src/caffe/util/db_leveldb.cpp:2:
/home/alex/usr/local/include/leveldb/iterator.h:80:9: error: expected nested-name-specifier before ‘CleanupFunction’
using CleanupFunction = void ()(void arg1, void* arg2);
^
/home/alex/usr/local/include/leveldb/iterator.h:81:24: error: ‘CleanupFunction’ has not been declared
void RegisterCleanup(CleanupFunction function, void* arg1, void* arg2);
^
/home/alex/usr/local/include/leveldb/iterator.h:88:5: error: ‘CleanupFunction’ does not name a type
CleanupFunction function;
^
/home/alex/usr/local/include/leveldb/iterator.h: In member function ‘bool leveldb::Iterator::CleanupNode::IsEmpty() const’:
/home/alex/usr/local/include/leveldb/iterator.h:94:35: error: ‘function’ was not declared in this scope
bool IsEmpty() const { return function == nullptr; }
^
/home/alex/usr/local/include/leveldb/iterator.h:94:47: error: ‘nullptr’ was not declared in this scope
bool IsEmpty() const { return function == nullptr; }
^
/home/alex/usr/local/include/leveldb/iterator.h: In member function ‘void leveldb::Iterator::CleanupNode::Run()’:
/home/alex/usr/local/include/leveldb/iterator.h:96:49: error: ‘function’ was not declared in this scope
void Run() { assert(function != nullptr); (function)(arg1, arg2); }
^
In file included from /home/alex/usr/local/include/leveldb/db.h:12:0,
from ./include/caffe/util/db_leveldb.hpp:7,
from src/caffe/util/db_leveldb.cpp:2:
/home/alex/usr/local/include/leveldb/options.h: In constructor ‘leveldb::ReadOptions::ReadOptions()’:
/home/alex/usr/local/include/leveldb/options.h:183:18: error: ‘nullptr’ was not declared in this scope
snapshot(nullptr) {
^
Makefile:581: recipe for target '.build_release/src/caffe/util/db_leveldb.o' failed
make: *** [.build_release/src/caffe/util/db_leveldb.o] Error 1
make: *** 正在等待未完成的任务....
In file included from /home/alex/usr/local/include/leveldb/iterator.h:20:0,
from /home/alex/usr/local/include/leveldb/db.h:11,
from ./include/caffe/util/db_leveldb.hpp:7,
from src/caffe/util/db.cpp:2:
/home/alex/usr/local/include/leveldb/status.h:26:10: error: expected ‘;’ at end of member declaration
Status() noexcept : state_(nullptr) { }
^
/home/alex/usr/local/include/leveldb/status.h:26:12: error: ‘noexcept’ does not name a type
Status() noexcept : state_(nullptr) { }
^
/home/alex/usr/local/include/leveldb/status.h:26:12: note: C++11 ‘noexcept’ only available with -std=c++11 or -std=gnu++11
/home/alex/usr/local/include/leveldb/status.h:32:16: error: expected ‘,’ or ‘...’ before ‘&&’ token
Status(Status&& rhs) noexcept : state_(rhs.state_) { rhs.state_ = nullptr; }
^
/home/alex/usr/local/include/leveldb/status.h:32:22: error: invalid constructor; you probably meant ‘leveldb::Status (const leveldb::Status&)’
Status(Status&& rhs) noexcept : state_(rhs.state_) { rhs.state_ = nullptr; }
^
/home/alex/usr/local/include/leveldb/status.h:32:22: error: expected ‘;’ at end of member declaration
/home/alex/usr/local/include/leveldb/status.h:32:24: error: ‘noexcept’ does not name a type
Status(Status&& rhs) noexcept : state_(rhs.state_) { rhs.state_ = nullptr; }
^
/home/alex/usr/local/include/leveldb/status.h:32:24: note: C++11 ‘noexcept’ only available with -std=c++11 or -std=gnu++11
/home/alex/usr/local/include/leveldb/status.h:33:27: error: expected ‘,’ or ‘...’ before ‘&&’ token
Status& operator=(Status&& rhs) noexcept;
^
/home/alex/usr/local/include/leveldb/status.h:33:33: error: expected ‘;’ at end of member declaration
Status& operator=(Status&& rhs) noexcept;
^
/home/alex/usr/local/include/leveldb/status.h:33:35: error: ‘noexcept’ does not name a type
Status& operator=(Status&& rhs) noexcept;
^
/home/alex/usr/local/include/leveldb/status.h:33:35: note: C++11 ‘noexcept’ only available with -std=c++11 or -std=gnu++11
/home/alex/usr/local/include/leveldb/status.h: In member function ‘bool leveldb::Status::ok() const’:
/home/alex/usr/local/include/leveldb/status.h:56:39: error: ‘nullptr’ was not declared in this scope
bool ok() const { return (state_ == nullptr); }
^
/home/alex/usr/local/include/leveldb/status.h: In member function ‘leveldb::Status::Code leveldb::Status::code() const’:
/home/alex/usr/local/include/leveldb/status.h:95:23: error: ‘nullptr’ was not declared in this scope
return (state_ == nullptr) ? kOk : static_cast(state_[4]);
^
/home/alex/usr/local/include/leveldb/status.h: In copy constructor ‘leveldb::Status::Status(const leveldb::Status&)’:
/home/alex/usr/local/include/leveldb/status.h:103:27: error: ‘nullptr’ was not declared in this scope
state_ = (rhs.state_ == nullptr) ? nullptr : CopyState(rhs.state_);
^
/home/alex/usr/local/include/leveldb/status.h: In member function ‘leveldb::Status& leveldb::Status::operator=(const leveldb::Status&)’:
/home/alex/usr/local/include/leveldb/status.h:110:29: error: ‘nullptr’ was not declared in this scope
state_ = (rhs.state_ == nullptr) ? nullptr : CopyState(rhs.state_);
^
/home/alex/usr/local/include/leveldb/status.h: At global scope:
/home/alex/usr/local/include/leveldb/status.h:114:40: error: expected ‘,’ or ‘...’ before ‘&&’ token
inline Status& Status::operator=(Status&& rhs) noexcept {
^
/home/alex/usr/local/include/leveldb/status.h:114:48: error: expected initializer before ‘noexcept’
inline Status& Status::operator=(Status&& rhs) noexcept {
^
In file included from /home/alex/usr/local/include/leveldb/db.h:11:0,
from ./include/caffe/util/db_leveldb.hpp:7,
from src/caffe/util/db.cpp:2:
/home/alex/usr/local/include/leveldb/iterator.h:80:9: error: expected nested-name-specifier before ‘CleanupFunction’
using CleanupFunction = void ()(void* arg1, void* arg2);
^
/home/alex/usr/local/include/leveldb/iterator.h:81:24: error: ‘CleanupFunction’ has not been declared
void RegisterCleanup(CleanupFunction function, void* arg1, void* arg2);
^
/home/alex/usr/local/include/leveldb/iterator.h:88:5: error: ‘CleanupFunction’ does not name a type
CleanupFunction function;
^
/home/alex/usr/local/include/leveldb/iterator.h: In member function ‘bool leveldb::Iterator::CleanupNode::IsEmpty() const’:
/home/alex/usr/local/include/leveldb/iterator.h:94:35: error: ‘function’ was not declared in this scope
bool IsEmpty() const { return function == nullptr; }
^
/home/alex/usr/local/include/leveldb/iterator.h:94:47: error: ‘nullptr’ was not declared in this scope
bool IsEmpty() const { return function == nullptr; }
^
/home/alex/usr/local/include/leveldb/iterator.h: In member function ‘void leveldb::Iterator::CleanupNode::Run()’:
/home/alex/usr/local/include/leveldb/iterator.h:96:49: error: ‘function’ was not declared in this scope
void Run() { assert(function != nullptr); (*function)(arg1, arg2); }
^
In file included from /home/alex/usr/local/include/leveldb/db.h:12:0,
from ./include/caffe/util/db_leveldb.hpp:7,
from src/caffe/util/db.cpp:2:
/home/alex/usr/local/include/leveldb/options.h: In constructor ‘leveldb::ReadOptions::ReadOptions()’:
/home/alex/usr/local/include/leveldb/options.h:183:18: error: ‘nullptr’ was not declared in this scope
snapshot(nullptr) {
^
Makefile:581: recipe for target '.build_release/src/caffe/util/db.o' failed
make: *** [.build_release/src/caffe/util/db.o] Error 1

when i make,it occurs. I install caffe in the virtualenv.(docker)

• Operating system: ubuntu16.04
• Compiler: gcc
• CUDA version (if applicable): 9.0
• CUDNN version (if applicable):
• BLAS: openblas
• Python version (if using pycaffe): 3.6
  Thanks!!!

[Noiredd]

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[huziling]

I have same problem。 Do you find any solution?

[appleship]

I think you can look at this
https://stackoverflow.com/questions/10851247/how-to-activate-c-11-in-cmake

[JuiChang]

I am using mac. Following the stackoverflow link above, in the Makefile, I change:

ifeq ($(OSX), 1)
	CXX := /usr/bin/clang++

to

ifeq ($(OSX), 1)
	CXX := /usr/bin/clang++ -std=c++11

and it works.

For linux, I guess changing:

ifeq ($(LINUX), 1)
	CXX ?= /usr/bin/g++

to

ifeq ($(LINUX), 1)
	CXX ?= /usr/bin/g++ -std=c++11

in the Makefile may work.