It is reasonable to pass -Dskip-non-native when unable to run foreign
binaries, however there is no option for being able to run foreign
static binaries but unable to run foreign dynamic binaries. This can
occur when qemu is installed but not cross glibc.
There are now very few stage1 cases remaining:
* `cases/compile_errors/stage1/obj/*` currently don't work correctly on
stage2. There are 6 of these, and most of them are probably fairly
simple to fix.
* `cases/compile_errors/async/*` and all remaining `safety/*` depend on
async; see #6025.
Resolves: #14849
* use the same hash function as the rest of the steps
* fix race condition due to a macOS oddity.
* fix race condition due to file truncation (rename into place instead)
* integrate with marking Step.result_cached. check if the file already
exists with fs.access before doing anything else.
* use a directory so that the file basename can be "options.zig"
instead of a hash digest.
* better error reporting in case of file system failures.
It doesn't matter if a pointer to a zero-bit (i.e. OPV) type is
undefined or runtime-known; we still know the result of the dereference
at comptime. Code may use this, for instance, when allocating zero-bit
types: `@as(*void, undefined)` is entirely reasonable to use at runtime,
since we know the pointer will never be accessed, thus it should be
valid at comptime too.
This test has a few problems:
* I don't want to vendor third party projects into the main compiler
repository such as kuba-zip just for test cases. If we want to test
third party projects, that should be a separate repository dedicated
to that purpose.
* Ideally tests would be isolated to test a particular thing, rather
than have a lot of unrelated logic that is not what is primarily
being tested.
* Ideally tests will not be named after GitHub issues, but named after
the thing that is being tested. And not testing for the absence of a
bug, but for the existence of correct behavior.
Aside from these issues, it's also failing in the LLVM 16 branch:
```
kuba-zip/zip.c:276:16: error: call to undeclared function 'fileno'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
kuba-zip/zip.c:277:14: error: call to undeclared function 'ftruncate'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
kuba-zip/zip.c:364:11: error: call to undeclared function 'symlink'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
```
These are not interesting failures related to the thing actually being
tested; this is busywork related to the fact that we vendor third party
code. So, that is why I chose to delete this test case instead of repair
it.
commit 3204d00a5e7fe119b690e921138a439fb84dff5b intended to move this
passing test case from stage1 folder but it was accidentally changed to
have identical contents as a different test case instead.
Fortunately, the test case has not regressed, so I simply replaced it
with the intended test from before.
In master branch this test tests native Windows. In this branch, I
accidentally made aarch64-windows test x86_64-windows which caused some
subtle behavior that we aren't ready to add test coverage for yet.
