test262 failure on s390x

[suve]

I'm currently trying to package quickjs-ng for Fedora Linux. When building v0.11.0 and running test262, I get this failure on the s390x architecture:

+ ./redhat-linux-build/run-test262 -m -c test262.conf -a
Result: 94/79935 errors, 3285 excluded, 5569 skipped, 2 new
test262/test/built-ins/TypedArray/prototype/set/typedarray-arg-set-values-same-buffer-other-type.js:47: unexpected error: Test262Error: 51539607552,42,0,4,5,6,7,8 (Testing with Float64Array.)
test262/test/built-ins/TypedArray/prototype/set/typedarray-arg-set-values-same-buffer-other-type.js:47: strict mode: unexpected error: Test262Error: 51539607552,42,0,4,5,6,7,8 (Testing with Float64Array.)

This may be related to endianness, as most popular instruction sets nowadays are little-endian, whereas s390x is big-endian.

[bnoordhuis]

Upstream bug, see tc39/test262#757.

You can patch test262.conf to exclude the test. There's unfortunately no way to say "exclude iff when BE."

[bnoordhuis]

If you want to fix the upstream bug (or carry a patch locally), what you can probably do is:

var isBE = (1 === new Uint8Array(new Uint16Array([1]).buffer)[1]);
if (isBE) {
  // ...
} else {
  // ...
}