[cfe-dev] libc++ MinGW build failure

[Howard Hinnant]

On Nov 11, 2012, at 12:31 PM, Ruben Van Boxem <vanboxem.ruben at gmail.com> wrote:

> Hi,
> 
> I wanted to take another look at libc++ on Windows,

Thanks!

> but I get a build failure due to (I think) libc++ itself:
> 
> + clang++ -c -g -Os -fPIC -std=c++0x -fstrict-aliasing -Wall -Wextra -Wshadow -Wconversion -Wpadded -Wmissing-prototypes -Wstrict-aliasing=2 -Wstrict-overflow=4 -nostdinc++ -I../include ../src/condition_variable.cpp
> In file included from ../src/condition_variable.cpp:10:
> ../include\condition_variable:158:25: error: constructor for 'std::__1::condition_variable_any' must explicitly initialize the member '__cv_' which does not have a default constructor
> condition_variable_any::condition_variable_any()
>                         ^

Just looking at this first one:  condition_variable is required to have a default constructor.  condition_variable (in <__mutex_base>) is currently only implemented on top of pthread_cond_t, and does have a default constructor if pthread_cond_t exists.  Does pthread_cond_t exist in your environment?

Howard


> ../include\condition_variable:121:24: note: member is declared here
>     condition_variable __cv_;
>                        ^
> ../include\__mutex_base:301:23: note: 'std::__1::condition_variable' declared here
> class _LIBCPP_VISIBLE condition_variable
>                       ^
> In file included from ../src/condition_variable.cpp:11:
> ../include\thread:433:11: error: no matching constructor for initialization of 'std::__1::mutex'
>     mutex __mut;
>           ^
> ../include\__mutex_base:48:5: note: candidate constructor not viable: requires 1 argument, but 0 were provided
>     mutex(const mutex&);// = delete;
>     ^
> In file included from ../src/condition_variable.cpp:11:
> ../include\thread:434:24: error: no matching constructor for initialization of 'std::__1::condition_variable'
>     condition_variable __cv;
>                        ^
> ../include\__mutex_base:314:5: note: candidate constructor not viable: requires 1 argument, but 0 were provided
>     condition_variable(const condition_variable&); // = delete;
>     ^
> In file included from ../src/condition_variable.cpp:10:
> In file included from ../include\condition_variable:112:
> ../include\memory:2087:40: error: constructor for
>       'std::__1::__libcpp_compressed_pair_imp<std::__1::allocator<std::__1::mutex>, std::__1::mutex, 1>' must explicitly initialize the member '__second_' which does not have a default constructor
>     _LIBCPP_INLINE_VISIBILITY explicit __libcpp_compressed_pair_imp(_T1_param __t1)
>                                        ^
> ../include\memory:2369:11: note: in instantiation of member function
>       'std::__1::__libcpp_compressed_pair_imp<std::__1::allocator<std::__1::mutex>, std::__1::mutex, 1>::__libcpp_compressed_pair_imp' requested here
>         : base(_VSTD::forward<_T1_param>(__t1)) {}
>           ^
> ../include\memory:3693:12: note: in instantiation of member function
>       'std::__1::__compressed_pair<std::__1::allocator<std::__1::mutex>, std::__1::mutex>::__compressed_pair' requested here
>         :  __data_(_VSTD::move(__a)) {}
>            ^
> ../include\memory:4272:26: note: in instantiation of member function
>       'std::__1::__shared_ptr_emplace<std::__1::mutex, std::__1::allocator<std::__1::mutex>>::__shared_ptr_emplace' requested here
>     ::new(__hold2.get()) _CntrlBlk(__a2, _VSTD::forward<_Args>(__args)...);
>                          ^
> ../include\memory:4631:12: note: in instantiation of function template specialization
>       'std::__1::shared_ptr<std::__1::mutex>::make_shared<>' requested here
>     return shared_ptr<_Tp>::make_shared(_VSTD::forward<_Args>(__args)...);
>            ^
> ../include\condition_variable:159:14: note: in instantiation of function template specialization 'std::__1::make_shared<std::__1::mutex, >' requested here
>     : __mut_(make_shared<mutex>()) {}
>              ^
> ../include\memory:2075:9: note: member is declared here
>     _T2 __second_;
>         ^
> ../include\__mutex_base:34:23: note: 'std::__1::mutex' declared here
> class _LIBCPP_VISIBLE mutex
>                       ^
> 4 errors generated.
> 
> This is with Clang 3.1. Any ideas?
> 
> Thanks,
> 
> Ruben
> 
> PS: please keep me in CC, I am not subscribed to cfe-dev
> 
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