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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - DenseMap segfaults due to (de)allocate_buffer incompatibility with C++17 host application."
href="https://bugs.llvm.org/show_bug.cgi?id=44131">44131</a>
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<th>Summary</th>
<td>DenseMap segfaults due to (de)allocate_buffer incompatibility with C++17 host application.
</td>
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<th>Product</th>
<td>libraries
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>release blocker
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Support Libraries
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>jcmac@machiel.info
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<pre>I have a C++17 Windows/MSVC host application that uses the llvm libraries
compiled with C++14. My application segfaults when running a release build due
to how allocate_buffer and deallocate_buffer are implemented.
In those functions, #ifdef __cpp_aligned_new is used to test for the
aligned_new feature which is present in C++17 but not in C++14. Because these
functions are defined in a header file (Compiler.h) this will introduce an
incompatibility when buffers are allocated by some llvm function and freed by
some function that eventually calls deallocate_buffer from my host application.
Buffers will be allocated without a specific alignment and then potentially
de-allocated with the aligned version of operator delete or vice versa.
Commenting those #ifdefs out fixes it for me.
Those function should either be implemented in a .cpp file or those #ifdefs
should use some #define that is defined at llvm library compile time instead of
using __cpp_aligned_new.</pre>
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