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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Mismatching signature on __tgt_target calls for 32bit hosts"
href="https://bugs.llvm.org/show_bug.cgi?id=41966">41966</a>
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<th>Summary</th>
<td>Mismatching signature on __tgt_target calls for 32bit hosts
</td>
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<th>Product</th>
<td>OpenMP
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Runtime Library
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>bucyril@ee.ethz.ch
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>The signature used for the __tgt_target call used by Clang is:
int32_t __tgt_target(int64_t device_id, void *host_ptr, int32_t arg_num, void
**args_base, void **args, size_t *arg_sizes, int64_t *arg_types);
In CGOpenMPRuntime.cpp, line 2235:
<a href="https://github.com/llvm-mirror/clang/blob/1353fe814c52fd2eb0324cea1099ed79703896ff/lib/CodeGen/CGOpenMPRuntime.cpp#L2235">https://github.com/llvm-mirror/clang/blob/1353fe814c52fd2eb0324cea1099ed79703896ff/lib/CodeGen/CGOpenMPRuntime.cpp#L2235</a>
The signature used in libomptarget is:
int32_t __tgt_target(int64_t device_id, void *host_ptr, int32_t arg_num, void
**args_base, void **args, int64_t *arg_sizes, int64_t *arg_types);
in interface.cpp, line 217:
<a href="https://github.com/llvm-mirror/openmp/blob/665d5c5112ab6ee1cba56733ec3a1b37e86aa55b/libomptarget/src/interface.cpp#L217">https://github.com/llvm-mirror/openmp/blob/665d5c5112ab6ee1cba56733ec3a1b37e86aa55b/libomptarget/src/interface.cpp#L217</a>
These differ for 32bit hosts in the argument `arg_sizes`, because Clang
generates `size_t*`, while libomptarget expects `int64_t*`. This results in
unreasonably large allocations and a subsequent segfault when more than one
argument is used for the offloaded call.</pre>
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