Add a sample for showing how to build binary with clang (#439)

* Add a sample for showing how to build binary with clang

* CCFLAGS => CFLAGS

* Using tweakable variables in bash script

.gitignore

@@ -5,3 +5,4 @@ Cargo.lock
 .deps/
 /examples/is13
 *.DS_Store
+tests/programs/deps

tests/programs/_build_clang.sh

@@ -0,0 +1,7 @@
+set -ex
+
+DOCKER="${DOCKER:-docker}"
+# docker pull docker.io/cryptape/llvm-n-rust:20240630
+DOCKER_IMAGE="${DOCKER_IMAGE:-docker.io/cryptape/llvm-n-rust@sha256:bafaf76d4f342a69b8691c08e77a330b7740631f3d1d9c9bee4ead521b29ee55}"
+
+$DOCKER run --rm -e UID=`id -u` -e GID=`id -g` $DOCKER_RUN_ARGS -v `pwd`:/code $DOCKER_IMAGE bash _build_clang_native.sh

tests/programs/_build_clang_native.sh

@@ -0,0 +1,27 @@
+set -ex
+
+ROOT_DIR=$(pwd)
+CLANG="${CLANG:-clang-18}"
+LD="${CLANG/clang/ld.lld}"
+CFLAGS="--target=riscv64 -march=rv64imac_zba_zbb_zbc_zbs -nostdinc -isystem $ROOT_DIR/deps/musl/release/include -c -fdata-sections -ffunction-sections"
+LDFLAGS="--gc-sections -nostdlib --sysroot $ROOT_DIR/deps/musl/release -L$ROOT_DIR/deps/musl/release/lib -lc -lgcc"
+
+if [ ! -d deps ]; then
+	mkdir deps
+fi
+
+if [ ! -d deps/musl ]; then
+	cd deps
+	git clone https://github.com/xxuejie/musl
+	cd musl
+	git checkout 603d5e9
+	cd ../..
+fi
+
+if [ ! -d deps/musl/release ]; then
+	cd deps/musl
+	CLANG=$CLANG ./ckb/build.sh
+	cd -
+fi
+
+$CLANG $CFLAGS clang_sample.c -o clang_sample.o && $LD $LDFLAGS clang_sample.o -o clang_sample && rm clang_sample.o

tests/programs/clang_sample.c

@@ -0,0 +1,3 @@
+int main() {
+    return 0;
+}

tests/test_misc.rs

@@ -13,6 +13,7 @@ use rand::{thread_rng, Rng};
 use std::fs;
 use std::sync::atomic::{AtomicU8, Ordering};
 use std::sync::Arc;
+pub mod machine_build;
 
 #[test]
 pub fn test_andi() {
@@ -431,3 +432,32 @@ pub fn test_outofcycles_in_syscall() {
     assert_eq!(machine.cycles(), 108);
     assert_eq!(machine.registers()[A0], 39);
 }
+
+#[test]
+pub fn test_clang() {
+    {
+        let mut machine = machine_build::int_v1_imcb("tests/programs/clang_sample");
+        let ret = machine.run();
+        assert!(ret.is_ok());
+    }
+
+    #[cfg(has_asm)]
+    {
+        let mut machine_asm = machine_build::asm_v1_imcb("tests/programs/clang_sample");
+        let ret_asm = machine_asm.run();
+        assert!(ret_asm.is_ok());
+    }
+
+    {
+        let mut machine = machine_build::int_v2_imacb("tests/programs/clang_sample");
+        let ret = machine.run();
+        assert!(ret.is_ok());
+    }
+
+    #[cfg(has_asm)]
+    {
+        let mut machine_asm = machine_build::asm_v2_imacb("tests/programs/clang_sample");
+        let ret_asm = machine_asm.run();
+        assert!(ret_asm.is_ok());
+    }
+}