Make tests C++

They use macros extensively. Future commits need to extend one of
them quite a lot, but compilation would fail, because the macros
in order to be reusable is going to compare some constants
resulting sometimes into expressions like uint >= 0. The compiler
doesn't allow such things, while in C++ it would be ok (worst case
it would need a constexpr attribute).

Part of tarantool/tarantool#9965.

Author: Gerold103

Diff for: CMakeLists.txt

@@ -1,4 +1,4 @@
-project(msgpuck C)
+project(msgpuck C CXX)
 cmake_minimum_required(VERSION 2.8.5)
 
 if(CMAKE_C_COMPILER_ID MATCHES "GNU|Clang")

Diff for: test/CMakeLists.txt

@@ -13,7 +13,7 @@ endif()
 
 set(alltests)
 foreach (test msgpuck)
-    add_executable(${test}.test ${test}.c test.c)
+    add_executable(${test}.test ${test}.cc test.c)
     target_link_libraries(${test}.test msgpuck)
 
     list(APPEND alltests ${test}.test_run)

Diff for: test/msgpuck.c renamed to test/msgpuck.cc

@@ -29,7 +29,6 @@
  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
-
 #include <assert.h>
 #include <string.h>
 #include <stdlib.h>
@@ -1155,9 +1154,9 @@ test_mp_print()
 	int mp_buff_sz = (MP_PRINT_MAX_DEPTH + 1) * mp_sizeof_array(1) +
 			 mp_sizeof_uint(1);
 	int exp_str_sz = 2 * (MP_PRINT_MAX_DEPTH + 1) + 3 + 1;
-	char *mp_buff = malloc(mp_buff_sz);
-	char *exp_str = malloc(exp_str_sz);
-	char *decoded = malloc(exp_str_sz);
+	char *mp_buff = (char *)malloc(mp_buff_sz);
+	char *exp_str = (char *)malloc(exp_str_sz);
+	char *decoded = (char *)malloc(exp_str_sz);
 	char *buff_wptr = mp_buff;
 	char *exp_str_wptr = exp_str;
 	for (int i = 0; i <= 2 * (MP_PRINT_MAX_DEPTH + 1); i++) {

Diff for: test/test.h

@@ -35,6 +35,10 @@
 
 #include <stdio.h>
 
+#if defined(__cplusplus)
+extern "C" {
+#endif /* defined(__cplusplus) */
+
 /**
 @brief example
 
@@ -125,4 +129,8 @@ int check_plan(void);
 	}						\
 }
 
+#if defined(__cplusplus)
+}
+#endif /* defined(__cplusplus) */
+
 #endif /* TEST_H_INCLUDED */