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In `LLVMRustHasFeature()`, rather than using `MCInfo->getFeatureTable()`
that is specific to Rust's LLVM fork, we can use this in LLVM 6:
/// Check whether the subtarget features are enabled/disabled as per
/// the provided string, ignoring all other features.
bool checkFeatures(StringRef FS) const;
Now rustc using external LLVM can also have `target_feature`.
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This is a test of `target_feature`, which needs a rust-specific patch to
LLVM to add `MCSubtargetInfo::getFeatureTable()`.
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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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The function should accept feature strings that old LLVM might not
support.
Simplify the code using the same approach used by
LLVMRustPrintTargetFeatures.
Dummify the function for non 4.0 LLVM and update the tests accordingly.
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This commit expands the existing x86_64-musl entry in the Travis matrix to also
build/test i586-unknown-linux-gnu and i686-unknown-linux-musl.
cc #38531
Closes #39053
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This test checks that all of the x86 architectures (both `x86` and
`x86_64`) have the `sse2` feature. This is currently true for all of
the targets whose target CPU is `pentium4` (or better), but it might
fail on other targets (for example on `i586`).
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