zephyr: Fix more C++ linkage

wolfssl/wolfcrypt/settings.h

@@ -2594,6 +2594,10 @@ extern void uITRON4_free(void *p) ;
 #endif /*(WOLFSSL_APACHE_MYNEWT)*/
 
 #ifdef WOLFSSL_ZEPHYR
+    #ifdef __cplusplus
+        }  /* extern "C" */
+    #endif
+
     #include <version.h>
 #if KERNEL_VERSION_NUMBER >= 0x30100
     #include <zephyr/kernel.h>
@@ -2606,6 +2610,10 @@ extern void uITRON4_free(void *p) ;
 #endif
     #include <stdlib.h>
 
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
     #define WOLFSSL_DH_CONST
     #define NO_WRITEV
     #define NO_STDLIB_ISASCII

wolfssl/wolfcrypt/wc_port.h

@@ -283,8 +283,6 @@
 #elif defined(WOLFSSL_APACHE_MYNEWT)
     /* do nothing */
 #elif defined(WOLFSSL_ZEPHYR)
-    /* Zephyr SDK can use a cpp compiler which will cause
-     * problems with extern "C" linkage if not handled */
     #ifdef __cplusplus
         }  /* extern "C" */
     #endif
@@ -994,8 +992,16 @@ WOLFSSL_ABI WOLFSSL_API int wolfCrypt_Cleanup(void);
     #define XFGETS(b,s,f) -2 /* Not ported yet */
 
 #elif defined(WOLFSSL_ZEPHYR)
+    #ifdef __cplusplus
+        }  /* extern "C" */
+    #endif
+
     #include <zephyr/fs/fs.h>
 
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
     #define XFILE      struct fs_file_t*
 
     /* These are our wrappers for opening and closing files to
@@ -1481,6 +1487,10 @@ WOLFSSL_ABI WOLFSSL_API int wolfCrypt_Cleanup(void);
     #define USE_WOLF_TIME_T
 
 #elif defined(WOLFSSL_ZEPHYR)
+    #ifdef __cplusplus
+        }  /* extern "C" */
+    #endif
+
     #include <version.h>
     #ifndef _POSIX_C_SOURCE
         #if KERNEL_VERSION_NUMBER >= 0x30100
@@ -1500,6 +1510,10 @@ WOLFSSL_ABI WOLFSSL_API int wolfCrypt_Cleanup(void);
         #endif
     #endif
 
+    #ifdef __cplusplus
+        extern "C" {
+    #endif
+
     time_t z_time(time_t *timer);
 
     #define XTIME(tl)       z_time((tl))

wolfssl/wolfio.h

@@ -176,6 +176,10 @@
         #include <lwip-socket.h>
         #include <errno.h>
     #elif defined(WOLFSSL_ZEPHYR)
+        #ifdef __cplusplus
+            }  /* extern "C" */
+        #endif
+
         #include <version.h>
         #if KERNEL_VERSION_NUMBER >= 0x30100
             #include <zephyr/net/socket.h>
@@ -188,6 +192,10 @@
                 #include <posix/sys/socket.h>
             #endif
         #endif
+
+        #ifdef __cplusplus
+            extern "C" {
+        #endif
     #elif defined(MICROCHIP_PIC32)
         #include <sys/errno.h>
     #elif defined(HAVE_NETX)