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Clang does not use this parameter as it is not required. All the required initialization can be performed using only the first ctor parameter.<br>
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<div id="AppleMailSignature" dir="ltr">Best regards,
<div>Alexey Bataev</div>
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20 дек. 2018 г., в 17:24, Simone Atzeni via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> написал(а):<br>
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<p class="MsoNormal">Hi guys,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am having some trouble making clang++ generate a call to `__kmpc_threadprivate_register` where the copy constructor is not NULL.<o:p></o:p></p>
<p class="MsoNormal">Looking at the generated LLVM IR it seems that clang approach, not matter how an object (declared as OpenMP threadprivate) is initialized, it will always generate a `__kmpc_global_ctor` and pass that to the ctor arg of ` __kmpc_threadprivate_register`.<o:p></o:p></p>
<p class="MsoNormal">The `__kmpc_global_ctor` will then do the object initialization in whatever way is specified by the program.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For example, in the C++ program attached, we have an object `x` of class `myclass` initialized with another object `a` of type `myclass`, so the copy constructor of `myclass` will be called to initialize the instance of x.<o:p></o:p></p>
<p class="MsoNormal">Then x is declared as `omp threadprivate`.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In the LLVM IR (also attached, I put only the interesting LLVM IR) there is a `__kmpc_global_ctor_` which calls inside the copy constructor. The `__kmpc_global_ctor_` is passed to the kmpc function `__kmpc_threadprivate_register` as ctor
arg, while NULL is passed in the cctor arg position.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My question is, is this an implementation choice or there is actually a way to make clang pass a copy constructor as a argument to `__kmpc_threadprivate_register`?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Maybe I am writing the wrong example and I am missing some knowledge about how C++ OpenMP threadprivate is supposed to work.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you!<o:p></o:p></p>
<p class="MsoNormal">Simone<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<div dir="ltr"><threadprivate_class_cctor.cpp></div>
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<div dir="ltr"><threadprivate_class_cctor.ll></div>
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