Re: [Boost-users] [thread] Getting this warning message with optimization turn on

On Mon, Jan 4, 2010 at 9:30 PM, mike marchywka wrote:

On 1/4/10, Anthony Williams wrote:

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Shiou Ming Lee writes:

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Hi, I'm building my program that depends on Boost.thread, but getting following warning message, only when compiler's optimization been turn on.

C:/boost_1_41_0/boost/thread/win32/thread_heap_alloc.hpp: In member function `bool gUtil::GLog::LogWriterManager::startAsyncLogging(unsigned int)': C:/boost_1_41_0/boost/thread/win32/thread_heap_alloc.hpp:156: warning: 'heap_memory' might be used uninitialized in this function

This is a really bizarre message. Line 156 is the declaration and initialization of heap_memory. How it could then be used uninitialized is beyond me.

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This happens for MinGW 3.4 on Windows Vista SP1 32-bits, but not for GCC 4.4 on Fedora 11 x86. The Boost release is of version 1.41.0.

It's win32-specific code, so isn't used on Fedora.

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Any idea what should I do for this warning message? Or should I just leave optimization on and ignore this message?

I've seen spurious optimization related messages in two scenarioes. Some compilers only notice when optimization is turned on and it is worthwhile to investigate. Other times they optimize away some code and then complain that it is missing. Is the latter possible?

Is there any way I can tell to which case it belongs? Sorry as I'm not familiar with things like compiler and optimization.

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I would leave optimization on and ignore the message.

Anthony -- Author of C++ Concurrency in Action http://www.stdthread.co.uk/book/ just::thread C++0x thread library http://www.stdthread.co.uk Just Software Solutions Ltd http://www.justsoftwaresolutions.co.uk 15 Carrallack Mews, St Just, Cornwall, TR19 7UL, UK. Company No. 5478976

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