fail unless _LIBCPP_ENABLE_EXPERIMENTAL is explicitly defined during compilation.

LLVM Bugs via llvm-bugs Tue, 17 Jun 2025 03:46:24 -0700

Issue	144499
Summary	Some tests under libcxx/test/std/experimental/simd/ fail unless _LIBCPP_ENABLE_EXPERIMENTAL is explicitly defined during compilation.
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Reporter	mrashad32

    I noticed that some tests under` libcxx/test/std/experimental/simd/` fail to build unless I manually define the macro `_LIBCPP_ENABLE_EXPERIMENTAL`.


For example, this test:
`libcxx/test/std/experimental/simd/simd.class/simd_width.pass.cpp`

I think this can be confusing for people running the tests, especially if they don’t know that this macro is needed.

So my question is, to add this to the additional flags will be a good suggestion? 

Thanks

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[llvm-bugs] [Bug 144499] Some tests under libcxx/test/std/experimental/simd/ fail unless _LIBCPP_ENABLE_EXPERIMENTAL is explicitly defined during compilation.

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