Add extern "C" block

programs/bpf/c/sdk/inc/sol_bpf.h

@@ -3,6 +3,10 @@
  * @brief Solana C-based BPF program utility functions and types
  */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Numeric types
  */
@@ -268,4 +272,8 @@ SOL_FN_PREFIX void sol_print_params(
  */
 extern bool entrypoint(const uint8_t *input);
 
+#ifdef __cplusplus
+}
+#endif
+
 /**@}*/