Fix hard and soft float libc detection for managed Python distributions on ARM (#8498)

crates/uv-python/src/platform.rs

@@ -1,3 +1,4 @@
+use crate::cpuinfo::detect_hardware_floating_point_support;
 use crate::libc::{detect_linux_libc, LibcDetectionError, LibcVersion};
 use std::fmt::Display;
 use std::ops::Deref;
@@ -30,7 +31,17 @@ impl Libc {
     pub(crate) fn from_env() -> Result<Self, LibcDetectionError> {
         match std::env::consts::OS {
             "linux" => Ok(Self::Some(match detect_linux_libc()? {
-                LibcVersion::Manylinux { .. } => target_lexicon::Environment::Gnu,
+                LibcVersion::Manylinux { .. } => match std::env::consts::ARCH {
+                    // Checks if the CPU supports hardware floating-point operations.
+                    // Depending on the result, it selects either the `gnueabihf` (hard-float) or `gnueabi` (soft-float) environment.
+                    // download-metadata.json only includes armv7.
+                    "arm" | "armv7" => match detect_hardware_floating_point_support() {
+                        Ok(true) => target_lexicon::Environment::Gnueabihf,
+                        Ok(false) => target_lexicon::Environment::Gnueabi,
+                        Err(_) => target_lexicon::Environment::Gnu,
+                    },
+                    _ => target_lexicon::Environment::Gnu,
+                },
                 LibcVersion::Musllinux { .. } => target_lexicon::Environment::Musl,
             })),
             "windows" | "macos" => Ok(Self::None),