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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - file_magic identifies file with two leading null bytes as a COFF object"
href="https://bugs.llvm.org/show_bug.cgi?id=44683">44683</a>
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<th>Summary</th>
<td>file_magic identifies file with two leading null bytes as a COFF object
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<th>Product</th>
<td>libraries
</td>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Object
</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>sbc@chromium.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>This is because the first two bytes of COFF is the machine type and machine
type 0 is IMAGE_FILE_MACHINE_UNKNOWN.
See:
<a href="https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#machine-types">https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#machine-types</a>
Is is a minor annoyance when dealing with rust archives because rust archives
because they seem to include a rust metadata file .. which means running
llvm-nm on them always generates a strange error such as:
`llvm-nm: error: libtest.a(rust.metadata.bin) The end of the file was
unexpectedly encountered
`
llvm-nm ignores non-object files but it thinks this file is a COFF object
becasue the file starts with bunch of leading zeros.
I think we can perhaps modify file_magic to be a little less eager when
identifying COFF objects.</pre>
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