[llvm-dev] [LLD] [WASM] wasm/function-index.test failing

[David Greene via llvm-dev]

David Greene via llvm-dev <llvm-dev at lists.llvm.org> writes:

> Rui Ueyama <ruiu at google.com> writes:
>
>> I cannot reproduce this error, but this could be real.
>>
>> David, is this reproducible every time or is this flaky?
>
> It's every time for me, both on X86-64 and AArch64.  I'll try running in
> a debugger to see what is going on.  What else can I do to help track
> this down?

Ok, I discovered something interesting.  I see the failure when
configuring like this:

  cmake -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON \
        -DLLVM_ABI_BREAKING_CHECKS=WITH_ASSERTS ...

I do *not* see the failure when configuring like this:

  cmake -DCMAKE_BUILD_TYPE=Debug -DLLVM_ENABLE_ASSERTIONS=ON \
        -DLLVM_ABI_BREAKING_CHECKS=WITH_ASSERTS ...


I set LLVM_ABI_BREAKING_CHECKS=FORCE_OFF for the Release build in
CMakeCache.txt and it still failed.

I then additionally set LLVM_ENABLE_ASSERTIONS=OFF for the Release build
in CMakeCache.txt and it still failed.

I then attempted to run the command in a debugger.  It passed.  It also
passed on the command-line.  So it appears something about the
environment lit sets up causes problems, but only for Release builds.

I tried adding a batch gdb command to the test but it passed.  The test
doesn't run long enough to allow attaching an external gdb.

So short of hacking on wasm-ld, I'm at a bit of a roadblock.  Ideas
welcome.  :)

                           -David