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This removes the need to maintain a list of all other
OSs which ignore the tests.
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It looks like many of these tests are already disabled on emscripten,
which also doesn't seem to support environment variables and subprocess
spawning. Just add a similar tag for CloudABI. While there, sort some of
the lists of operating systems alphabetically.
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This informs LLVM that functions can't unwind, which while it should typically
have already been inferred when necessary or otherwise not impact codegen is
apparently needed on targets like ARM to avoid references to unnecessary
symbols.
Closes #44992
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This commit alters the translation layer to unconditionally emit the `uwtable`
LLVM attribute on Windows regardless of the `no_landing_pads` setting.
Previously I believe we omitted this attribute as an optimization when the
`-Cpanic=abort` flag was passed, but this unfortunately caused problems for
Gecko.
It [was discovered] that there was trouble unwinding through Rust functions due
to foreign exceptions such as illegal instructions or otherwise in-practice
methods used to abort a process. In testing it looked like the major difference
between a working binary and a non-working binary is indeed this `uwtable`
attribute, but this PR has unfortunately not been thoroughly tested in terms of
compiling Gecko with `-C panic=abort` *and* this PR to see whether it works, so
this is still somewhat working on just suspicion.
[was discovered]: https://bugzilla.mozilla.org/show_bug.cgi?id=1302078
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