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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - throw of a C string is causing an error when targeting wasm32"
href="https://bugs.llvm.org/show_bug.cgi?id=45171">45171</a>
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<th>Summary</th>
<td>throw of a C string is causing an error when targeting wasm32
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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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>wasm
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>sliftist@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, sbc@chromium.org
</td>
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<p>
<div>
<pre>Compiling with code that throws an exception yields an undefined symbol error:
~/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang ./test.cpp
--target=wasm32 -nostdlib -Wl,--no-entry -Wl,--export-all
Error:
wasm-ld: error: /tmp/test-eac9ed.o: undefined symbol: typeinfo for char
const*
clang-9: error: linker command failed with exit code 1 (use -v to see
invocation)
./test.cpp:
extern "C" {
void* __cxa_allocate_exception(unsigned int thrown_size) { return
nullptr; }
void __cxa_throw(void* thrown_object, void* type, void(*dest)(void*)) {
}
}
void testThrow() {
throw "test";
}
I could not find instructions for how to define "typeinfo for char const*" in
the llvm document on exception handling
(<a href="https://llvm.org/docs/ExceptionHandling.html">https://llvm.org/docs/ExceptionHandling.html</a>), but there could just be an
undocumented (or maybe I just could not find the documentation) manner to allow
exception throwing of const char* in WebAssembly.</pre>
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