gnu.cfg: Added support for error() function. And a TODO testcase for ticket #11197.

cfg/gnu.cfg

@@ -1585,6 +1585,16 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- https://man7.org/linux/man-pages/man3/error.3.html -->
+  <!-- void error(int status, int errnum, const char *format, ...); -->
+  <function name="error">
+    <noreturn>true</noreturn>
+    <leak-ignore/>
+    <returnValue type="void"/>
+    <arg nr="any" direction="in">
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- ########## Resource allocation ########## -->
   <resource>
     <alloc init="true">mkostemp</alloc>

test/cfg/gnu.c

@@ -23,7 +23,15 @@
 #include <sys/epoll.h>
 #endif
 #include <strings.h>
+#include <error.h>
 
+void unreachableCode_error(void) // #11197
+{
+    error(1, 0, ""); // will call exit() if the first parameter is non-zero
+    // cppcheck-suppress unusedVariable
+    // TODO cppcheck-suppress unreachableCode
+    int i;
+}
 
 int nullPointer_getservent_r(struct servent *restrict result_buf, char *restrict buf, size_t buflen, struct servent **restrict result)
 {