Fixed #13211: gnu.cfg: Improved configuration of backtrace() (danmar#6908)

Author: orbitcowboy

cfg/gnu.cfg

@@ -709,6 +709,7 @@
   <function name="backtrace">
     <returnValue type="int"/>
     <noreturn>false</noreturn>
+    <leak-ignore/>
     <arg nr="1" direction="out">
       <not-null/>
       <minsize type="argvalue" arg="2"/>

test/cfg/gnu.c

@@ -23,6 +23,7 @@
 #include <sys/mman.h>
 #include <sys/sem.h>
 #include <wchar.h>
+#include <execinfo.h>
 #if !defined(__CYGWIN__) && !defined(__APPLE__)
 #include <sys/epoll.h>
 #endif
@@ -47,6 +48,15 @@ void unreachableCode_error(void) // #11197
 }
 #endif
 
+
+int deallocuse_backtrace(int size) {
+    void **buffer = (void **)malloc(sizeof(void *) * size);
+    free(buffer);
+    // cppcheck-suppress deallocuse
+    int numEntries = backtrace(buffer, size);
+    return numEntries;
+}
+
 void leakReturnValNotUsed_get_current_dir_name(void)
 {
     // cppcheck-suppress leakReturnValNotUsed