Merge pull request #12 from nervosnetwork/use-cxx-compatible-restrict

feat: Use cxx compatible restrict

Author: xxuejie

Makefile

@@ -1,4 +1,4 @@
-default: fmt clippy test bench-test check test-c-impl
+default: fmt clippy test bench-test check test-c-impl test-cxx-build
 
 test:
 	cargo test --all --all-features
@@ -18,3 +18,6 @@ check:
 test-c-impl:
 	git submodule update --init --recursive
 	cd c/rust-tests && cargo test
+
+test-cxx-build:
+	g++ -c c/rust-tests/src/tests/ckb_smt.c -I c -o smt.o && rm -rf smt.o

c/ckb_smt.h

@@ -7,6 +7,12 @@
 #ifndef _CKB_SPARSE_MERKLE_TREE_H_
 #define _CKB_SPARSE_MERKLE_TREE_H_
 
+#ifdef __GNUC__
+#define RESTRICT __restrict__
+#else
+#define RESTRICT
+#endif
+
 // The faster version of memset & memcpy implementations used here are from
 // the awesome musl libc project: https://www.musl-libc.org/
 void *_smt_fast_memset(void *dest, int c, size_t n)
@@ -97,7 +103,7 @@ void *_smt_fast_memset(void *dest, int c, size_t n)
 	return dest;
 }
 
-void *_smt_fast_memcpy(void *restrict dest, const void *restrict src, size_t n)
+void *_smt_fast_memcpy(void * RESTRICT dest, const void * RESTRICT src, size_t n)
 {
 	unsigned char *d = (unsigned char *)dest;
 	const unsigned char *s = (unsigned char *)src;
@@ -218,6 +224,8 @@ void *_smt_fast_memcpy(void *restrict dest, const void *restrict src, size_t n)
 	return dest;
 }
 
+#undef RESTRICT
+
 // users can define a new stack size if needed
 #ifndef SMT_STACK_SIZE
 #define SMT_STACK_SIZE 257