diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index a66e0210908..a9069c045e8 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -5,6 +5,7 @@
   <!-- https://pubs.opengroup.org/onlinepubs/9699919799/functions/wait.html -->
   <!-- Note: These are defined as macros in POSIX system headers -->
   <function name="WIFEXITED,WEXITSTATUS,WIFSIGNALED,WTERMSIG,WIFSTOPPED,WSTOPSIG,WIFCONTINUED">
+    <pure/>
     <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -2901,6 +2902,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <!-- http://pubs.opengroup.org/onlinepubs/009695399/basedefs/arpa/inet.h.html -->
   <!-- uint32_t htonl(uint32_t); -->
   <function name="htonl">
+    <pure/>
     <returnValue type="uint32_t"/>
     <noreturn>false</noreturn>
     <use-retval/>
@@ -2911,6 +2913,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   </function>
   <!-- uint16_t htons(uint16_t); -->
   <function name="htons">
+    <pure/>
     <returnValue type="uint16_t"/>
     <noreturn>false</noreturn>
     <use-retval/>
@@ -2921,6 +2924,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   </function>
   <!-- uint32_t ntohl(uint32_t); -->
   <function name="ntohl">
+    <pure/>
     <returnValue type="uint32_t"/>
     <noreturn>false</noreturn>
     <use-retval/>
@@ -2931,6 +2935,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   </function>
   <!-- uint16_t ntohs(uint16_t); -->
   <function name="ntohs">
+    <pure/>
     <returnValue type="uint16_t"/>
     <noreturn>false</noreturn>
     <use-retval/>
@@ -5456,6 +5461,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <!-- see http://man7.org/linux/man-pages/man3/strnlen.3.html-->
   <!-- size_t strnlen(const char *s, size_t maxlen); -->
   <function name="strnlen,wcsnlen">
+    <pure/>
     <use-retval/>
     <returnValue type="size_t"/>
     <noreturn>false</noreturn>
@@ -5926,6 +5932,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <!-- http://pubs.opengroup.org/onlinepubs/000095399/functions/sigismember.html -->
   <!-- int sigismember(const sigset_t *set, int signum);-->
   <function name="sigismember">
+    <pure/>
     <returnValue type="int"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -6174,6 +6181,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
   <!-- These are defined as macros http://man7.org/linux/man-pages/man7/inode.7.html -->
   <!-- It is better to configure them as functions -->
   <function name="S_ISREG,S_ISDIR,S_ISCHR,S_ISBLK,S_ISFIFO,S_ISLNK,S_ISSOCK">
+    <pure/>
     <returnValue type="int"/>
     <use-retval/>
     <noreturn>false</noreturn>
diff --git a/cfg/qt.cfg b/cfg/qt.cfg
index 8d599ed5d3d..840293b1778 100644
--- a/cfg/qt.cfg
+++ b/cfg/qt.cfg
@@ -63,6 +63,7 @@
   <define name="SLOT(X)" value="#X"/>
   <!-- T qAbs(const T &t) -->
   <function name="qAbs">
+    <pure/>
     <noreturn>false</noreturn>
     <use-retval/>
     <arg nr="1" direction="in">
@@ -147,6 +148,7 @@
   <!-- bool qFuzzyIsNull(double d) -->
   <!-- bool qFuzzyIsNull(float f) -->
   <function name="qFuzzyIsNull">
+    <pure/>
     <noreturn>false</noreturn>
     <returnValue type="bool"/>
     <use-retval/>
@@ -2337,7 +2339,8 @@
   </function>
   <!-- bool QDir::exists(QString &name) const -->
   <!-- bool QDir::exists() const -->
-  <function name="QDir">
+  <function name="QDir::exists">
+    <const/>
     <noreturn>false</noreturn>
     <returnValue type="bool"/>
     <use-retval/>
@@ -2357,6 +2360,7 @@
   <!-- bool QFile::exists(const QString &fileName) // static -->
   <!-- bool QFile::exists() const -->
   <function name="QFile::exists">
+    <const/>
     <noreturn>false</noreturn>
     <returnValue type="bool"/>
     <use-retval/>
@@ -2722,6 +2726,7 @@
   <!-- bool QDate::isValid() const -->
   <!-- bool QDate::isValid(int year, int month, int day) // static -->
   <function name="QDate::isValid">
+    <pure/>
     <noreturn>false</noreturn>
     <returnValue type="bool"/>
     <use-retval/>
diff --git a/cfg/std.cfg b/cfg/std.cfg
index bcea6e88b28..dac3d19be99 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -3253,6 +3253,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- double log(double x); -->
   <function name="log,std::log">
+    <pure/>
     <use-retval/>
     <returnValue type="double">log(arg1)</returnValue>
     <noreturn>false</noreturn>
@@ -3264,6 +3265,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- float logf(float x); -->
   <function name="logf,std::logf">
+    <pure/>
     <use-retval/>
     <returnValue type="float">log(arg1)</returnValue>
     <noreturn>false</noreturn>
@@ -3275,6 +3277,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- long double logl(long double x);-->
   <function name="logl,std::logl">
+    <pure/>
     <use-retval/>
     <returnValue type="long double">log(arg1)</returnValue>
     <noreturn>false</noreturn>
@@ -3288,6 +3291,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   <!-- float complex clogf(float complex x); -->
   <!-- long double complex clogl(long double complex x);-->
   <function name="clog,clogf,clogl">
+    <pure/>
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -3299,6 +3303,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   <!-- float complex conjf(float complex x);-->
   <!-- long double complex conjl(long double complex x);-->
   <function name="conj,conjf,conjl">
+    <pure/>
     <use-retval/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -5636,6 +5641,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- int toupper(int c); -->
   <function name="toupper,std::toupper">
+    <pure/>
     <use-retval/>
     <returnValue type="int">arg1 &lt; 'a' || arg1 &gt; 'z' ? arg1 : arg1 - 32</returnValue>
     <noreturn>false</noreturn>
@@ -5648,6 +5654,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!-- typeid operator -->
   <function name="typeid">
+    <pure/>
     <use-retval/>
     <noreturn>false</noreturn>
     <arg nr="1"/>
@@ -8594,6 +8601,7 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
   <!-- bool std::map::contains( const Key& key ) const; // since C++20 -->
   <!-- template< class K > bool std::map::contains( const K& x ) const; // since C++20 -->
   <function name="std::map::contains">
+    <const/>
     <noreturn>false</noreturn>
     <returnValue type="bool"/>
     <use-retval/>