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<base href="https://bugs.llvm.org/">
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - WebAssembly: handleWeakUndefines(): Assertion `FuncSym->Signature' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=40219">40219</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>WebAssembly: handleWeakUndefines(): Assertion `FuncSym->Signature' failed.
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alonzakai@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org
</td>
</tr></table>
<p>
<div>
<pre>Running emcc on this testcase:
===
#include <stdio.h>
extern int __attribute__((weak)) externWeak();
int main() {
printf("%p\n", externWeak);
if (externWeak) externWeak();
printf("ok.\n");
}
===
fails with
===
$ emcc a.cpp
wasm-ld: lld/wasm/Driver.cpp:309: void handleWeakUndefines(): Assertion
`FuncSym->Signature' failed.
Stack dump:
0. Program arguments: llvm/build/bin/wasm-ld --export-dynamic -z
stack-size=5242880 --global-base=1024 --initial-memory=16777216 -o
/tmp/emscripten_temp_sTTiBb/a.out.wasm --no-entry --allow-undefined
--import-memory --import-table --export __wasm_call_ctors --export __data_end
--lto-O0 /tmp/emscripten_temp_sTTiBb/a_0.o .emscripten_cache/wasm_bc/libc.bc
.emscripten_cache/wasm_bc/libc-wasm.bc .emscripten_cache/wasm_bc/libdlmalloc.bc
.emscripten_cache/wasm_bc/libcompiler_rt.a
.emscripten_cache/wasm_bc/libcompiler_rt_wasm.a
.emscripten_cache/wasm_bc/libc_rt_wasm.a --max-memory=16777216 -mllvm
-combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm
-disable-lsr --export main --export malloc --export free --export setThrew
--export __errno_location --export fflush
#0 0x000055a51502006a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(llvm/build/bin/wasm-ld+0x52a06a)
#1 0x000055a51501e594 llvm::sys::RunSignalHandlers()
(llvm/build/bin/wasm-ld+0x528594)
#2 0x000055a51501e6c2 SignalHandler(int) (llvm/build/bin/wasm-ld+0x5286c2)
#3 0x00007f67cd2f70c0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x110c0)
#4 0x00007f67cbacefcf gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x32fcf)
#5 0x00007f67cbad03fa abort (/lib/x86_64-linux-gnu/libc.so.6+0x343fa)
#6 0x00007f67cbac7e37 (/lib/x86_64-linux-gnu/libc.so.6+0x2be37)
#7 0x00007f67cbac7ee2 (/lib/x86_64-linux-gnu/libc.so.6+0x2bee2)
#8 0x000055a514f09ced handleWeakUndefines() (llvm/build/bin/wasm-ld+0x413ced)
#9 0x000055a51524e707 (anonymous
namespace)::LinkerDriver::link(llvm::ArrayRef<char const*>) (.constprop.320)
(llvm/build/bin/wasm-ld+0x758707)
#10 0x000055a51524ef3f lld::wasm::link(llvm::ArrayRef<char const*>, bool,
llvm::raw_ostream&) (llvm/build/bin/wasm-ld+0x758f3f)
#11 0x000055a514f75577 main (llvm/build/bin/wasm-ld+0x47f577)
#12 0x00007f67cbabc2b1 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x202b1)
#13 0x000055a515007e4a _start (llvm/build/bin/wasm-ld+0x511e4a)
===
See also
* <a href="https://github.com/kripken/emscripten-fastcomp/pull/248">https://github.com/kripken/emscripten-fastcomp/pull/248</a>
* <a href="https://github.com/kripken/emscripten/pull/7805">https://github.com/kripken/emscripten/pull/7805</a></pre>
</div>
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