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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wasm32: Same symbol erroneously imported from the same module"
href="https://bugs.llvm.org/show_bug.cgi?id=44316">44316</a>
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<th>Summary</th>
<td>wasm32: Same symbol erroneously imported from the same module
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>wasm
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</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>
</tr></table>
<p>
<div>
<pre>I believe I've run into a case where:
* The same symbol is imported defined in two codegen units
* Each codegen unit imports the symbol from a different wasm module
* When linked, the symbols get coalesced to being imported from the same wasm
module
For example if you have a.c as:
void foo(void)
__attribute__((__import_module__("a")));
void a(void) {
foo();
}
and you have b.c as
void foo(void)
__attribute__((__import_module__("b")));
void b(void) {
foo();
}
and you have c.c as:
void a(void);
void b(void);
void start(void) {
a();
b();
}
then when compiled and linked you get:
$ clang --target=wasm32-unknown-unknown -c a.c
$ clang --target=wasm32-unknown-unknown -c b.c
$ clang --target=wasm32-unknown-unknown -c c.c
$ wasm-ld a.o b.o c.o -o foo.wasm --no-entry --export start
--allow-undefined
$ wasm2wat foo.wasm | grep import
(import "a" "foo" (func $foo (type 0)))
I would expect, though, that the name `foo` should be imported from both the
"a" module and the "b" module.</pre>
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