Don't pass target-features to host tests.

This avoids a flood of warnings when testing the
armv7-unknown-linux-gnueabihf target.

Under this target, we would pass -Ctarget-features=+neon when building
intrinsic-test, but it is compiled for the host (and this tool doesn't
need Neon even if the host _is_ Armv7).

This also sets --target when running the 'hex' example, since that
seems more appropriate than always building it for the host.

ci/run.sh

@@ -11,6 +11,7 @@ set -ex
 #export RUST_TEST_THREADS=1
 
 export RUSTFLAGS="${RUSTFLAGS} -D warnings -Z merge-functions=disabled "
+export HOST_RUSTFLAGS="${RUSTFLAGS}"
 
 export STDARCH_DISABLE_DEDUP_GUARD=1
 
@@ -147,18 +148,26 @@ case ${TARGET} in
 esac
 
 if [ "${TARGET}" = "aarch64-unknown-linux-gnu" ]; then
-    export CPPFLAGS="-fuse-ld=lld -I/usr/aarch64-linux-gnu/include/ -I/usr/aarch64-linux-gnu/include/c++/9/aarch64-linux-gnu/"
-    RUST_LOG=warn cargo run ${INTRINSIC_TEST} --release --bin intrinsic-test -- intrinsics_data/arm_intrinsics.json --runner "${CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUNNER}" --cppcompiler "clang++-15" --skip crates/intrinsic-test/missing_aarch64.txt
+    (
+        CPPFLAGS="-fuse-ld=lld -I/usr/aarch64-linux-gnu/include/ -I/usr/aarch64-linux-gnu/include/c++/9/aarch64-linux-gnu/" \
+            RUSTFLAGS="$HOST_RUSTFLAGS" \
+            RUST_LOG=warn \
+            cargo run ${INTRINSIC_TEST} --release --bin intrinsic-test -- intrinsics_data/arm_intrinsics.json --runner "${CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_RUNNER}" --cppcompiler "clang++-15" --skip crates/intrinsic-test/missing_aarch64.txt
+    )
 elif [ "${TARGET}" = "armv7-unknown-linux-gnueabihf" ]; then
-    export CPPFLAGS="-fuse-ld=lld -I/usr/arm-linux-gnueabihf/include/ -I/usr/arm-linux-gnueabihf/include/c++/9/arm-linux-gnueabihf/"
-    RUST_LOG=warn cargo run ${INTRINSIC_TEST} --release --bin intrinsic-test -- intrinsics_data/arm_intrinsics.json --runner "${CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_RUNNER}" --cppcompiler "clang++-15" --skip crates/intrinsic-test/missing_arm.txt --a32
+    (
+        CPPFLAGS="-fuse-ld=lld -I/usr/arm-linux-gnueabihf/include/ -I/usr/arm-linux-gnueabihf/include/c++/9/arm-linux-gnueabihf/" \
+            RUSTFLAGS="$HOST_RUSTFLAGS" \
+            RUST_LOG=warn \
+            cargo run ${INTRINSIC_TEST} --release --bin intrinsic-test -- intrinsics_data/arm_intrinsics.json --runner "${CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_RUNNER}" --cppcompiler "clang++-15" --skip crates/intrinsic-test/missing_arm.txt --a32
+    )
 fi
 
 if [ "$NORUN" != "1" ] && [ "$NOSTD" != 1 ]; then
     # Test examples
     (
         cd examples
         cargo test --target "$TARGET"
-        echo test | cargo run --release hex
+        echo test | cargo run --target "$TARGET" --release hex
     )
 fi