Include extern "C" wrapper in headers so they can be used from C++ code

blkmaker.h

@@ -7,6 +7,10 @@
 
 #include <blktemplate.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define BLKMAKER_VERSION (5L)
 #define BLKMAKER_MAX_BLOCK_VERSION (2)
 
@@ -26,4 +30,8 @@ extern unsigned long blkmk_work_left(const blktemplate_t *);
 
 extern size_t blkmk_address_to_script(void *out, size_t outsz, const char *addr);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

blkmaker_jansson.h

@@ -5,9 +5,17 @@
 
 #include <blktemplate.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern json_t *blktmpl_request_jansson(gbt_capabilities_t extracaps, const char *lpid);
 extern const char *blktmpl_add_jansson(blktemplate_t *, const json_t *, time_t time_rcvd);
 extern json_t *blkmk_submit_jansson(blktemplate_t *, const unsigned char *data, unsigned int dataid, blknonce_t);
 extern json_t *blkmk_submit_foreign_jansson(blktemplate_t *, const unsigned char *data, unsigned int dataid, blknonce_t);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

blktemplate.h

@@ -12,6 +12,10 @@
 #include <stdint.h>
 #include <time.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef uint32_t blkheight_t;
 typedef uint32_t libblkmaker_hash_t[8];
 typedef libblkmaker_hash_t blkhash_t;
@@ -132,4 +136,8 @@ extern const struct blktmpl_longpoll_req *blktmpl_get_longpoll(blktemplate_t *);
 extern bool blktmpl_get_submitold(blktemplate_t *tmpl);
 extern void blktmpl_free(blktemplate_t *);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif