https://bugs.llvm.org/show_bug.cgi?id=45171
Bug ID: 45171
Summary: throw of a C string is causing an error when targeting
wasm32
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: wasm
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
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
(https://llvm.org/docs/ExceptionHandling.html), 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.
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