This ought to be a duplicate question. But I've googled quite a bit and haven't found a hit that fixes my issue.
I'm trying to use a c++11 standard feature on osx lion and it's not working. I believe this feature is called list initializers. according to http://clang.llvm.org/cxx_status.html This feature was in clang 3.1, which is the version I'm using.
Below is the shell o/p explaining my simple test. Can anyone tell me what I'm doing wrong? Am I forgetting a flag?
The compiler is:
:tmp$ c++ --version
Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.2
Thread model: posix
:tmp$ which c++
/usr/bin/c++
:tmp$ ls -alt /usr/bin/c++
lrwxr-xr-x 1 root wheel 7 Jul 12 13:17 /usr/bin/c++ -> clang++
The OS is
:tmp$ uname -a
Darwin .local 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64
The test file is
:tmp$ cat test.cpp
#include <vector>
int main(){
std::vector<int> vec1 {1,2,3};
std::vector<int> vec2={1,2,3};
}
The compiler output is
:tmp$ c++ -std=c++11 test.cpp
test.cpp:4:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec1 {1,2,3};
^ ~~~~~~~
test.cpp:5:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec2={1,2,3};
^ ~~~~~~~
2 errors generated.
Ok I didn't want to get there because the following takes a lot to format properly on stackoverflow. But adding -stdlib=c++ creates even more problems. Now I get 14 errors.
:tmp$ c++ -std=c++11 -stdlib=libc++ test.cpp
In file included from test.cpp:1:
In file included from /usr/bin/../lib/c++/v1/vector:261:
In file included from /usr/bin/../lib/c++/v1/__bit_reference:15:
In file included from /usr/bin/../lib/c++/v1/algorithm:591:
/usr/bin/../lib/c++/v1/type_traits:737:2: error: #error is_base_of not
implemented.
#error is_base_of not implemented.
^
/usr/bin/../lib/c++/v1/type_traits:1700:13: error: use of undeclared identifier
'is_base_of'
is_base_of<_Class, typename remove_reference<_Tp>::type>::value>
^
/usr/bin/../lib/c++/v1/type_traits:1700:24: error: '_Class' does not refer to a
value
is_base_of<_Class, typename remove_reference<_Tp>::type>::value>
^
/usr/bin/../lib/c++/v1/type_traits:1697:28: note: declared here
template <class _Rp, class _Class, class _Tp>
^
/usr/bin/../lib/c++/v1/type_traits:1700:62: error: expected class name
is_base_of<_Class, typename remove_reference<_Tp>::type>::value>
^
In file included from test.cpp:1:
In file included from /usr/bin/../lib/c++/v1/vector:261:
In file included from /usr/bin/../lib/c++/v1/__bit_reference:15:
In file included from /usr/bin/../lib/c++/v1/algorithm:594:
In file included from /usr/bin/../lib/c++/v1/memory:590:
In file included from /usr/bin/../lib/c++/v1/typeinfo:61:
/usr/bin/../lib/c++/v1/exception:194:20: error: use of undeclared identifier
'is_base_of'
!is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:194:31: error: 'nested_exception' does not
refer to a value
!is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:166:29: note: declared here
class _LIBCPP_EXCEPTION_ABI nested_exception
^
/usr/bin/../lib/c++/v1/exception:194:81: error: parameter declarator cannot be
qualified
...typename remove_reference<_Tp>::type>::value
~~^
/usr/bin/../lib/c++/v1/exception:194:85: error: expected ')'
...typename remove_reference<_Tp>::type>::value
^
/usr/bin/../lib/c++/v1/exception:192:18: note: to match this '('
throw_with_nested(_Tp&& __t, typename enable_if<
^
/usr/bin/../lib/c++/v1/exception:213:19: error: use of undeclared identifier
'is_base_of'
is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:213:30: error: 'nested_exception' does not
refer to a value
is_base_of<nested_exception, typename ...
^
/usr/bin/../lib/c++/v1/exception:166:29: note: declared here
class _LIBCPP_EXCEPTION_ABI nested_exception
^
/usr/bin/../lib/c++/v1/exception:213:80: error: parameter declarator cannot be
qualified
...typename remove_reference<_Tp>::type>::value
~~^
/usr/bin/../lib/c++/v1/exception:213:84: error: expected ')'
...typename remove_reference<_Tp>::type>::value
^
/usr/bin/../lib/c++/v1/exception:211:18: note: to match this '('
throw_with_nested(_Tp&& __t, typename enable_if<
^
test.cpp:4:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec1 {1,2,3};
^ ~~~~~~~
test.cpp:5:20: error: non-aggregate type 'std::vector<int>' cannot be
initialized with an initializer list
std::vector<int> vec2={1,2,3};
^ ~~~~~~~
14 errors generated.
Specifically, I had to go to XCode preferences->Downloads and install "Command Line Tools". That fixed the problem.
What happened was a simple case of outdated software. Since OSX was up-to-date (through software update), I assumed all the XCode and compiler updates are also in place. Which was not the case.
Notice in the comment to the question I said "I have the latest version of XCode for Lion." But I didn't.(bames53 alludes to that in his answer) Just because you don't have any new updates in the OSX software update doesn't mean that you have the latest XCode compiler. You update it through XCode Preferences.
With the help of Jonathan's feedback and some more googling, Using clang with libc++ and c++11 from the command line with mac os x fixed my problem.
This actually updated the llvm toolchain.
$ c++ --version
Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.2
Thread model: posix