Improved testing of std.cfg.

cfg/std.cfg

@@ -3888,6 +3888,9 @@
       <function name="find" action="find"/>
     </access>
   </container>
+  <container id="stdComplex" startPattern="std :: complex &lt;" endPattern="&gt; !!::">
+    <type templateParameter="1"/>
+  </container>
   <container id="stdAllString" inherits="stdContainer">
     <type string="std-like"/>
     <size>

test/cfg/std.c

@@ -3378,3 +3378,11 @@ void invalidFunctionArgBool_abs(bool b, double x, double y)
     // cppcheck-suppress invalidFunctionArgBool
     (void)abs(x<y); // #5635
 }
+
+void ignoredReturnValue_abs(int i)
+{
+    // cppcheck-suppress ignoredReturnValue
+    abs(i);
+    // cppcheck-suppress constStatement
+    abs(-100);
+}

test/cfg/std.cpp

@@ -2709,3 +2709,20 @@ void uninitvar_setbase(void)
     std::cout << std::setbase(p);
 }
 
+void invalidFunctionArgBool_abs(bool b, double x, double y)
+{
+    // cppcheck-suppress invalidFunctionArgBool
+    (void)std::abs(true); // #6990
+    // cppcheck-suppress invalidFunctionArgBool
+    (void)std::abs(b); // #6990
+    // cppcheck-suppress invalidFunctionArgBool
+    (void)std::abs(x<y); // #5635
+}
+
+void ignoredReturnValue_abs(int i)
+{
+    // cppcheck-suppress ignoredReturnValue
+    std::abs(i);
+    // cppcheck-suppress constStatement
+    std::abs(-199);
+}