Update run.sh

Author: tgross35

ci/run.sh

@@ -6,9 +6,6 @@ target="${1:-}"
 
 export RUST_BACKTRACE="${RUST_BACKTRACE:-full}"
 
-# Make all linker warnings an error
-export RUSTFLAGS="${RUSTFLAGS:-} -Clink-arg=-Wl,--fatal-warnings"
-
 if [ -z "$target" ]; then
     host_target=$(rustc -vV | awk '/^host/ { print $2 }')
     echo "Defaulted to host target $host_target"
@@ -22,6 +19,17 @@ if [ "${USING_CONTAINER_RUSTC:-}" = 1 ]; then
         rustup target add "$target"
 fi
 
+# Make all linker warnings errors
+if [[ "$target" == *"-apple-"* ]]; then
+    extra_rustflags=" -Clink-arg=-Wl,--fatal_warnings"
+elif [[ "$target" == "thumb"* ]]; then
+    extra_rustflags=""
+else
+    extra_rustflags=" -Clink-arg=--fatal-warnings"
+fi
+
+export RUSTFLAGS="${RUSTFLAGS:-}$extra_rustflags"
+
 # Test our implementation
 if [ "${NO_STD:-}" = "1" ]; then
     echo "nothing to do for no_std"