Add macos to CI

Author: xxuejie

.github/workflows/rust.yml

@@ -22,3 +22,19 @@ jobs:
       run: make prepare build test clippy fmt
     - name: git diff
       run: git diff --exit-code
+
+  macos-build:
+
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+    - name: Install llvm 18
+      run: brew install llvm@18
+    - uses: actions-rust-lang/setup-rust-toolchain@v1
+    - name: Prepare, build, test, clippy, format
+      run: make prepare build test clippy fmt
+    - name: git diff
+      run: git diff --exit-code

tests/sphincsplus/Makefile

@@ -1,6 +1,6 @@
 cur_dir = $(dir $(abspath $(firstword $(MAKEFILE_LIST))))
 
-CC := clang-18
+CLANG := clang-18
 TOP := $(cur_dir)/../..
 
 PARAMS = sphincs-shake-256f
@@ -25,7 +25,7 @@ all: build/test_sphincsplus
 
 build/test_sphincsplus: test-ckb-sphincs-plus.c $(SOURCES) $(HEADERS)
 	mkdir -p build
-	$(CC) $(CFLAGS) -o $@ $(SOURCES) $<
+	$(CLANG) $(CFLAGS) -o $@ $(SOURCES) $<
 
 clean:
 	rm -rf build/test_sphincsplus