src/sharedspice.c, add ATTRIBUTE_NORETURN to function `shared_exit()' declaration

src/frontend/error.c

@@ -16,7 +16,7 @@ Author: 1985 Wayne A. Christopher, U. C. Berkeley CAD Group
 #ifdef HAS_WINGUI
 void winmessage(char *new_msg);
 #elif defined SHARED_MODULE
-extern void shared_exit(int status);
+extern ATTRIBUTE_NORETURN void shared_exit(int status);
 #endif
 
 /* global error message buffer */

src/frontend/numparam/spicenum.c

@@ -29,7 +29,7 @@ Todo:
 #include "ngspice/fteext.h"
 
 #ifdef SHARED_MODULE
-extern void shared_exit(int status);
+extern ATTRIBUTE_NORETURN void shared_exit(int status);
 #endif
 
 extern bool ft_batchmode;

src/sharedspice.c

@@ -185,7 +185,7 @@ int sh_ExecutePerLoop(void);
 double getvsrcval(double, char*);
 int sh_vecinit(runDesc *run);
 
-void shared_exit(int status);
+ATTRIBUTE_NORETURN void shared_exit(int status);
 
 void sighandler_sharedspice(int num);
 
@@ -1450,7 +1450,7 @@ void SetAnalyse(
 
 /* a dll or shared library should never exit, if loaded dynamically,
    but ask for graceful shutdown (e.g. being detached) via a callback function */
-void shared_exit(int status)
+ATTRIBUTE_NORETURN void shared_exit(int status)
 {
     /* alert caller to detach dll (if we are in the main thread),
     or detach after a short sleep, if immediate is true, and we are