CPP: Add exception for builtins.

cpp/ql/src/Likely Bugs/Conversion/LossyFunctionResultCast.ql

@@ -11,7 +11,10 @@
 
 import cpp
 
-predicate whitelist(string fName) {
+predicate whitelist(Function f) {
+  exists(string fName |
+    fName = f.getName() and
+    (
       fName = "ceil" or
       fName = "ceilf" or
       fName = "ceill" or
@@ -29,7 +32,10 @@ predicate whitelist(string fName) {
       fName = "roundl" or
       fName = "trunc" or
       fName = "truncf" or
-  fName = "truncl"
+      fName = "truncl" or
+      fName.matches("__builtin_%")
+    )
+  )
 }
 
 predicate whitelistPow(FunctionCall fc) {
@@ -44,7 +50,7 @@ predicate whitelistPow(FunctionCall fc) {
 }
 
 predicate whiteListWrapped(FunctionCall fc) {
-  whitelist(fc.getTarget().getName()) or
+  whitelist(fc.getTarget()) or
   whitelistPow(fc) or
   exists(ReturnStmt rs |
     rs.getEnclosingFunction() = fc.getTarget() and