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5673130
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2011-04-15T06:28:28.230
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2011-04-15T06:28:28.230
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In general, if you want a function to be included in the final library / executable, it need be: <ul> <li>used</li> <li>non-inlined</li> </ul> And <code>inlined</code> function is a function whose code is simply copied and pasted where the function is used (by the compiler) so that there is no function call. It's an opportunity optimization, so a function may be inlined in some places and not inlined in others, depending on the context. Most very short functions (so-called one-liners) are generally inlined. In the old times, to be inlined a function needed be defined in the current translation unit, that is: <ul> <li>either it is defined in the header (like is your case), and thus can be inlined in all sources including this header</li> <li>either it is defined in a source file, and thus can be inlined in this source file</li> </ul> Nowadays though we also have LTO (Link Time Optimization), and if activated the linker may actually inline function calls. Those optimizations are also responsible for cleaning up the resulting library/binary from unused symbols. There are two possible solutions to your issue: <ul> <li>define the function in a source file instead, it is standard and may not be wiped out</li> <li>use compiler specific attributes to mark the function as used, so that it's not wiped out</li> </ul> In the latter case, if you wish for portability, I can only advise using a macro (<code>ATTRIBUTE_USED</code>) and define its content depending on the current compiler used.
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1. POStrange linking behavior, latest g++
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1. USMatthieu M.
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