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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ms] #pragma bss_seg fails to apply to globals with user provided constructors"
href="https://bugs.llvm.org/show_bug.cgi?id=41865">41865</a>
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<th>Summary</th>
<td>[ms] #pragma bss_seg fails to apply to globals with user provided constructors
</td>
</tr>
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<th>Product</th>
<td>clang
</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>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Consider:
$ cat t.cpp
struct Foo {
int x, y;
Foo() : x(1), y(2) {}
};
#pragma bss_seg("my_bss")
Foo gv;
$ cl -c t.cpp && dumpbin t.obj | grep bss
Microsoft (R) C/C++ Optimizing Compiler Version 19.20.27508.1 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
t.cpp
8 my_bss
$ clang-cl -c t.cpp && dumpbin t.obj | grep bss
8 .bss
Clang thinks `gv` has an initializer, so it would apply the most recently
active data_seg pragma, instead of bss_seg. The code to control this is here:
<a href="https://github.com/llvm/llvm-project/blob/master/clang/lib/Sema/SemaDecl.cpp#L11926">https://github.com/llvm/llvm-project/blob/master/clang/lib/Sema/SemaDecl.cpp#L11926</a></pre>
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