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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 - [AArch64] .note.gnu.property always generated for object file without code"
href="https://bugs.llvm.org/show_bug.cgi?id=46480">46480</a>
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<th>Summary</th>
<td>[AArch64] .note.gnu.property always generated for object file without code
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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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>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>keescook@chromium.org
</td>
</tr>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The .note.gnu.property is generated even when -mbranch-protection=none is used,
on a source file that only has data (no code).
$ cat foo.c
int global = 5;
$ clang --target=aarch64-linux-gnu -c -o foo.o foo.c
$ readelf -n foo.o
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: BTI, PAC
$ clang --target=aarch64-linux-gnu -mbranch-protection=none -c -o foo.o foo.c
$ readelf -n foo.o
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: BTI, PAC
$ aarch64-linux-gnu-gcc -c -o foo.o foo.c
$ readelf -n foo.o
$ aarch64-linux-gnu-gcc -mbranch-protection=bti -c -o foo.o foo.c
$ readelf -n foo.o
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: BTI
$ cat bar.c
int code(void) { return 5; }
$ clang --target=aarch64-linux-gnu -c -o bar.o bar.c
$ readelf -n bar.o
$ clang --target=aarch64-linux-gnu -mbranch-protection=bti -c -o bar.o bar.c
$ readelf -n bar.o
Displaying notes found in: .note.gnu.property
Owner Data size Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: BTI</pre>
</div>
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