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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Type merging regression in lib/Linker"
href="http://llvm.org/bugs/show_bug.cgi?id=22807">22807</a>
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<th>Summary</th>
<td>Type merging regression in lib/Linker
</td>
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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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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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>Linker
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>dexonsmith@apple.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, rafael.espindola@gmail.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13988" name="attach_13988" title="reinitialize-linker.patch: patch that "fixes" the bug (the wrong way)">attachment 13988</a> <a href="attachment.cgi?id=13988&action=edit" title="reinitialize-linker.patch: patch that "fixes" the bug (the wrong way)">[details]</a></span>
reinitialize-linker.patch: patch that "fixes" the bug (the wrong way)
Here's an interesting regression in type merging in lib/Linker. The example
that follows would merge %struct.A in 3.5, but doesn't in ToT.
I've attached a patch that "fixes" the problem (the wrong way) by not reusing
the `Linker` in `llvm-link`. I haven't dug into what's going on though.
Here's the example:
$ cat A1.ll
%struct.A = type { %struct.B* }
%struct.B = type opaque
define i32 @foo(%struct.A** %A) {
ret i32 0
}
$ cat A2.ll
%struct.A = type { %struct.B* }
%struct.B = type opaque
define i32 @bar(%struct.A* %A) {
ret i32 0
}
$ cat B.ll
%struct.B = type { %struct.A* }
%struct.A = type opaque
define i32 @baz(%struct.B* %BB) {
ret i32 0
}
$ llvm-link -S -o - B.ll A1.ll A2.ll
; ModuleID = 'llvm-link'
%struct.B = type { %struct.A* }
%struct.A = type { %struct.B* }
%struct.A.2 = type { %struct.B* }
define i32 @baz(%struct.B* %BB) {
ret i32 0
}
define i32 @foo(%struct.A** %A) {
ret i32 0
}
define i32 @bar(%struct.A.2* %A) {
ret i32 0
}</pre>
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