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I'm running into problems compiling on Ubuntu 16.04 LTS (server). It compiles okay if I don't include the -std=c++11 bit. Clang version is 3.8.
>cat foo.cpp #include <string> #include <iostream> using namespace std; int main(int argc,char** argv) { string s(argv[0]); cout << s << endl; } >clang++ -std=c++11 -stdlib=libc++ foo.cpp In file included from foo.cpp:1: /usr/include/c++/v1/string:1938:44: error: 'basic_string<_CharT, _Traits, _Allocator>' is missing exception specification 'noexcept(is_nothrow_copy_constructible<allocator_type>::value)' basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type& __a) ^ /usr/include/c++/v1/string:1326:40: note: previous declaration is here _LIBCPP_INLINE_VISIBILITY explicit basic_string(const allocator_type& __a) ^ 1 error generated. 
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2.4. To compile a C++ program on the command line, run the clang++ compiler as follows: $ scl enable llvm-toolset-6.0 'clang++ -o output_file source_file ...' This creates a binary file named output_file in the current working directory. If the -o option is omitted, the clang++ compiler creates a file named a.
clang is a C, C++, and Objective-C compiler which encompasses preprocessing, parsing, optimization, code generation, assembly, and linking. Depending on which high-level mode setting is passed, Clang will stop before doing a full link.
Clang is much faster and uses far less memory than GCC. Clang aims to provide extremely clear and concise diagnostics (error and warning messages), and includes support for expressive diagnostics. GCC's warnings are sometimes acceptable, but are often confusing and it does not support expressive diagnostics.
Until the Debian bug mentioned in Mike Kinghan's reply is fixed, just adding the missing (but required) noexcept specification to the ctor definition manually allows to work around the problem, i.e. you could just add
#if _LIBCPP_STD_VER <= 14 _NOEXCEPT_(is_nothrow_copy_constructible<allocator_type>::value) #else _NOEXCEPT #endif after the line 1938 of /usr/include/c++/v1/string.
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You have installed libc++-dev on ubuntu 16.04 in the (correct) expectation that it ought to let you build with clang++ using libc++ and its headers for your standard library.
It ought to, but in the presence of std=c++11 (or later standard), it doesn't, because of Debian bug #808086, which you have run into.
If you wish to compile with clang++ to the C++11 standard or later, then until ubuntu gets a fix for this you will have to do so without libc++, using libstdc++ (the GNU C++ standard library) instead, which is the default behaviour.
clang++ -std=c++11 foo.cpp or:
clang++ -std=c++11 -stdlib=libstdc++ foo.cpp will work.
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