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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLD doesn't preserve import modules on wasm32-unknown-unknown-wasm"
href="https://bugs.llvm.org/show_bug.cgi?id=37168">37168</a>
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<th>Summary</th>
<td>LLD doesn't preserve import modules on wasm32-unknown-unknown-wasm
</td>
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<th>Product</th>
<td>lld
</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>All
</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>
</tr>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>alex@crichton.co
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, sbc@chromium.org
</td>
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<p>
<div>
<pre>LLD currently doesn't preserve the import module of imports when generating a
final binary. I've been testing this first by creating an IR file:
define void @main() {
call void @foo();
ret void
}
declare void @foo() #0
attributes #0 = { "wasm-import-module"="bar" }
Then compiling that with LLC:
$ llc foo.ll -filetype=obj -mtriple=wasm32-unknown-unknown-wasm
Then linking it with LLD
$ lld -flavor wasm foo.o -o foo.wasm --no-entry --allow-undefined
And finally looking at it with `wasm2wat`
$ wasm2wat foo.o | grep '"foo"'
(import "bar" "foo" (func (;0;) (type 0)))
$ wasm2wat foo.wasm | grep '"foo"'
(import "env" "foo" (func $foo (type 0)))
Here the import of the function `@foo` was correctly listed in the object file
as from the module "bar", but after running through LLD it was rewritten back
to "env"</pre>
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