Use the compiler to determine whether or not to enable f16 and f128#963
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Currently we whether or not to build and test `f16` and `f128` support
mostly based on the target triple. This isn't always accurate, however,
since support also varies by backend and the backend version.
Since recently, `rustc` is aware of this with the unstable config option
`target_has_reliable_{f16,f128}`, which better represents when the types
are actually expected to be available and usable. Switch our
compiler-builtins and libm configuration to use this by probing `rustc`
for the target's settings.
A few small `cfg` fixes are needed with this.
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Amanieu
approved these changes
Jul 2, 2025
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Currently we whether or not to build and test
f16andf128supportmostly based on the target triple. This isn't always accurate, however,
since support also varies by backend and the backend version.
Since recently,
rustcis aware of this with the unstable config optiontarget_has_reliable_{f16,f128}, which better represents when the typesare actually expected to be available and usable. Switch our
compiler-builtins and libm configuration to use this by probing
rustcfor the target's settings.
A few small
cfgfixes are needed with this.