diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index 91ec34597..c9b2dbf50 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -7,6 +7,7 @@
   <!-- http://man7.org/linux/man-pages/man2/accept.2.html -->
   <!-- int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags); -->
   <function name="accept">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -25,6 +26,7 @@
   </function>
   <!-- long long atoq(const char *nptr); -->
   <function name="atoq">
+    <returnValue type="long long"/>
     <use-retval/>
     <noreturn>false</noreturn>
     <arg nr="1">
@@ -34,6 +36,7 @@
   </function>
   <!-- char *strndupa(const char *s, size_t n); -->
   <function name="strndupa">
+    <returnValue type="char *"/>
     <use-retval/>
     <noreturn>false</noreturn>
     <arg nr="1">
@@ -49,6 +52,7 @@
   <!-- char *strsep(char **stringp, const char *delim); -->
   <function name="strsep">
     <use-retval/>
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -61,6 +65,7 @@
   <!-- char *strdupa(const char *s); -->
   <function name="strdupa">
     <use-retval/>
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-null/>
@@ -70,6 +75,7 @@
   <!-- http://www.gnu.org/software/libc/manual/html_node/Backtraces.html -->
   <!-- int backtrace (void **buffer, int size) -->
   <function name="backtrace">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-null/>
@@ -81,6 +87,7 @@
   </function>
   <!-- char ** backtrace_symbols (void *const *buffer, int size) -->
   <function name="backtrace_symbols">
+    <returnValue type="char **"/>
     <noreturn>false</noreturn>
     <use-retval/>
     <arg nr="1">
@@ -109,6 +116,7 @@
   </function>
   <!-- char *qecvt(long double value, int ndigit, int * decpt, int * sign); -->
   <function name="ecvt">
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -125,6 +133,7 @@
   </function>
   <!-- char *qfcvt(double value, int ndigit, int * decpt, int * sign); -->
   <function name="qfcvt">
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -141,6 +150,7 @@
   </function>
   <!-- char *qgcvt(long double value, int ndigit, char *buf); -->
   <function name="qgcvt">
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -154,6 +164,7 @@
   </function>
   <!-- int ecvt_r (double value, int ndigit, int *decpt, int *neg, char *buf, size_t len); -->
   <function name="ecvt_r">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <pure/>
     <arg nr="1">
@@ -178,6 +189,7 @@
   </function>
   <!-- int fcvt_r (double value, int ndigit, int *decpt, int *neg, char *buf, size_t len); -->
   <function name="fcvt_r">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <pure/>
     <arg nr="1">
@@ -202,6 +214,7 @@
   </function>
   <!-- int qecvt_r (long double value, int ndigit, int *decpt, int *neg, char *buf, size_t len); -->
   <function name="qecvt_r">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <pure/>
     <arg nr="1">
@@ -226,6 +239,7 @@
   </function>
   <!-- int qfcvt_r (long double value, int ndigit, int *decpt, int *neg, char *buf, size_t len); -->
   <function name="qfcvt_r">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <pure/>
     <arg nr="1">
@@ -252,6 +266,7 @@
   <!-- size_t strcasestr(const char *s1, const char *s2); -->
   <function name="strcasestr">
     <use-retval/>
+    <returnValue type="size_t"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <pure/>
@@ -267,6 +282,7 @@
   <!-- http://linux.die.net/man/2/getresuid -->
   <!-- int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid); -->
   <function name="getresuid">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <pure/>
@@ -283,6 +299,7 @@
   <!-- http://linux.die.net/man/2/getresuid -->
   <!-- int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid); -->
   <function name="getresgid">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <pure/>
@@ -299,6 +316,7 @@
   <!-- http://man7.org/linux/man-pages/man2/setresuid.2.html -->
   <!-- int setresuid(uid_t ruid, uid_t euid, uid_t suid);-->
   <function name="setresuid">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -314,6 +332,7 @@
   <!-- http://man7.org/linux/man-pages/man2/setresuid.2.html -->
   <!-- int setresgid(gid_t rgid, gid_t egid, gid_t sgid);-->
   <function name="setresgid">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -328,6 +347,7 @@
   </function>
   <!-- int inet_aton (const char *name, struct in_addr *addr); -->
   <function name="inet_aton">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -340,6 +360,7 @@
   </function>
   <!-- uint32_t inet_addr (const char *name); -->
   <function name="inet_addr">
+    <returnValue type="uint32_t"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -349,6 +370,7 @@
   </function>
   <!-- uint32_t inet_network (const char *name); -->
   <function name="inet_network">
+    <returnValue type="uint32_t"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -358,6 +380,7 @@
   </function>
   <!-- char * inet_ntoa (struct in_addr addr); -->
   <function name="inet_ntoa">
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -366,6 +389,7 @@
   </function>
   <!-- struct in_addr inet_makeaddr (uint32_t net, uint32_t local); -->
   <function name="inet_makeaddr">
+    <returnValue type="struct in_addr"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -381,6 +405,7 @@
   </function>
   <!-- uint32_t inet_lnaof (struct in_addr addr); -->
   <function name="inet_lnaof">
+    <returnValue type="uint32_t"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -389,6 +414,7 @@
   </function>
   <!-- uint32_t inet_netof (struct in_addr addr); -->
   <function name="inet_netof">
+    <returnValue type="uint32_t"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -397,6 +423,7 @@
   </function>
   <!-- int inet_pton (int af, const char *cp, void *buf); -->
   <function name="inet_pton">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -412,6 +439,7 @@
   </function>
   <!-- const char * inet_ntop (int af, const void *cp, char *buf, socklen_t len);-->
   <function name="inet_ntop">
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-uninit/>
@@ -430,6 +458,7 @@
   </function>
   <!-- char *canonicalize_file_name(const char *path); -->
   <function name="canonicalize_file_name">
+    <returnValue type="char *"/>
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -439,6 +468,7 @@
   </function>
   <!-- int execvpe(const char *file, char *const argv[], char *const envp[]); -->
   <function name="execvpe">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <arg nr="1">
@@ -455,6 +485,7 @@
   <!-- int mkostemp(char *template, int flags); 
        int mkstemps(char *template, int suffixlen);-->
   <function name="mkostemp,mkstemps">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <arg nr="1">
@@ -467,6 +498,7 @@
   </function>
   <!-- int mkostemps(char *template, int suffixlen, int flags); -->
   <function name="mkostemps">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <arg nr="1">
@@ -543,6 +575,7 @@
        int ffsll(long long int i); -->
   <function name="ffsl,ffsll">
     <use-retval/>
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <arg nr="1">
@@ -553,6 +586,7 @@
   <!-- char *strchrnul(const char *s, int c); -->
   <function name="strchrnul">
     <use-retval/>
+    <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <arg nr="1">
@@ -568,6 +602,7 @@
   <!-- int prlimit(pid_t pid, int resource, const struct rlimit *new_limit,
                    struct rlimit *old_limit); -->
   <function name="prlimit">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
     <arg nr="1">
@@ -590,6 +625,7 @@
        int epoll_create1(int flags); -->
   <function name="epoll_create,epoll_create1">
     <noreturn>false</noreturn>
+    <returnValue type="int"/>
     <arg nr="1">
       <not-bool/>
       <not-uninit/>
@@ -598,6 +634,7 @@
   <!-- int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event); -->
   <function name="epoll_ctl">
     <noreturn>false</noreturn>
+    <returnValue type="int"/>
     <arg nr="1">
       <not-bool/>
       <not-uninit/>
@@ -618,6 +655,7 @@
   <!-- int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout); -->
   <function name="epoll_wait">
     <noreturn>false</noreturn>
+    <returnValue type="int"/>
     <arg nr="1">
       <not-bool/>
       <not-uninit/>
@@ -639,6 +677,7 @@
   <!-- int epoll_pwait(int epfd, struct epoll_event *events, int maxevents, int timeout, const sigset_t *sigmask); -->
   <function name="epoll_pwait">
     <noreturn>false</noreturn>
+    <returnValue type="int"/>
     <arg nr="1">
       <not-bool/>
       <not-uninit/>
@@ -675,6 +714,7 @@
        int epoll_create1(int flags); -->
   <function name="epoll_create,epoll_create1">
     <noreturn>false</noreturn>
+    <returnValue type="int"/>
     <arg nr="1">
       <not-bool/>
       <not-uninit/>
@@ -682,6 +722,7 @@
   </function>
   <!-- int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event); -->
   <function name="epoll_ctl">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-bool/>
@@ -702,6 +743,7 @@
   </function>
   <!-- int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout); -->
   <function name="epoll_wait">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-bool/>
@@ -723,6 +765,7 @@
   </function>
   <!-- int epoll_pwait(int epfd, struct epoll_event *events, int maxevents, int timeout, const sigset_t *sigmask); -->
   <function name="epoll_pwait">
+    <returnValue type="int"/>
     <noreturn>false</noreturn>
     <arg nr="1">
       <not-bool/>
diff --git a/gui/resultstree.cpp b/gui/resultstree.cpp
index b7bc2798c..424c95b8c 100644
--- a/gui/resultstree.cpp
+++ b/gui/resultstree.cpp
@@ -1003,7 +1003,8 @@ void ResultsTree::saveErrors(Report *report, QStandardItem *item) const
     }
 }
 
-void ResultsTree::readErrorItem(const QStandardItem *error, ErrorItem *item) const {
+void ResultsTree::readErrorItem(const QStandardItem *error, ErrorItem *item) const
+{
     //Get error's user data
     QVariant userdata = error->data();
     //Convert it to QVariantMap