在 C++ Builder 中编译 Boost 库时的警告

Question

当我尝试在 C++ Builder 中包含 <boost/thread.hpp> 时收到警告。对于我包含的每个单元，C++ Builder 都会显示以下两行：

thread_heap_alloc.hpp(59): W8128 Can't import a function being defined
thread_heap_alloc.hpp(69): W8128 Can't import a function being defined

已经尝试了一些东西，但没有任何效果。

它编译正确，但是让我很紧张。为什么会显示此消息？

这些行是：

#include <boost/config/abi_prefix.hpp>

namespace boost
{
    namespace detail
    {
        inline BOOST_THREAD_DECL void* allocate_raw_heap_memory(unsigned size)
        { 
            void* const eap_memory=detail::win32::HeapAlloc(detail::win32::GetProcessHeap(),0,size);
            if(!heap_memory)
            {
                throw std::bad_alloc();
            }
        return heap_memory;
    }

    inline BOOST_THREAD_DECL void free_raw_heap_memory(void* heap_memory)
    {
        BOOST_VERIFY(detail::win32::HeapFree(detail::win32::GetProcessHeap(),0,heap_memory)!=0);
    }

其中 59 是 BOOST_THREAD_DECL 下方的 {，69 也是如此。看起来 BOOST_THREAD_DECL 未正确定义或定义错误，尝试遵循 Boost 代码并不容易。

这是 Boost 1.39。

Answer 1

在包含 thread.hpp 之前添加#define BOOST_THREAD_USE_LIB。

这是我测试的：

#define BOOST_THREAD_USE_LIB
extern "C"
{
   namespace boost
   {
      void tss_cleanup_implemented( void )
      {
         /*
         This function's sole purpose is to cause a link error in cases where
         automatic tss cleanup is not implemented by Boost.Threads as a
         reminder that user code is responsible for calling the necessary
         functions at the appropriate times (and for implementing an a
         tss_cleanup_implemented() function to eliminate the linker's
         missing symbol error).

         If Boost.Threads later implements automatic tss cleanup in cases
         where it currently doesn't (which is the plan), the duplicate
         symbol error will warn the user that their custom solution is no
         longer needed and can be removed.*/
      }
   }
}
#include <boost/thread.hpp>

然后设置“Link with Dynamic RTL”和“Link with Runtime Packages”。

这会进行干净的构建并正确启动线程。