some `-Wdouble-promotion` Clang compiler warnings (#4820)

cmake/compileroptions.cmake

@@ -73,14 +73,11 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
         add_link_options(-lc++)
     endif()
 
-   add_compile_options_safe(-Wno-documentation-unknown-command)
-
    # TODO: fix and enable these warnings - or move to suppression list below
+    add_compile_options_safe(-Wno-documentation-unknown-command) # TODO: Clang currently does not support all commands
    add_compile_options_safe(-Wno-inconsistent-missing-destructor-override) # caused by Qt moc code
    add_compile_options_safe(-Wno-unused-exception-parameter)
    add_compile_options_safe(-Wno-old-style-cast)
-   add_compile_options_safe(-Wno-global-constructors)
-   add_compile_options_safe(-Wno-exit-time-destructors)
    add_compile_options_safe(-Wno-sign-conversion)
    add_compile_options_safe(-Wno-shadow-field-in-constructor)
    add_compile_options_safe(-Wno-covered-switch-default)
@@ -102,16 +99,26 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
    add_compile_options_safe(-Wno-tautological-type-limit-compare)
    add_compile_options(-Wno-disabled-macro-expansion)
    add_compile_options_safe(-Wno-bitwise-instead-of-logical)
-   add_compile_options_safe(-Wno-unsafe-buffer-usage)
 
-   # warnings we are not interested in
+   # these cannot be fixed properly without adopting later C++ standards
-   add_compile_options(-Wno-four-char-constants)
+   add_compile_options_safe(-Wno-unsafe-buffer-usage)
-   add_compile_options(-Wno-c++98-compat)
+   add_compile_options_safe(-Wno-global-constructors)
-   add_compile_options(-Wno-weak-vtables)
+   add_compile_options_safe(-Wno-exit-time-destructors)
+
+   # can only be partially addressed
    add_compile_options(-Wno-padded)
+
+   # no need for C++98 compatibility
+   add_compile_options(-Wno-c++98-compat)
    add_compile_options(-Wno-c++98-compat-pedantic)
+
+   # only need to be addressed to work around issues in older compilers
    add_compile_options_safe(-Wno-return-std-move-in-c++11)
 
+    # warnings we are currently not interested in
+   add_compile_options(-Wno-four-char-constants)
+   add_compile_options(-Wno-weak-vtables)
+
    if(ENABLE_COVERAGE OR ENABLE_COVERAGE_XML)
       message(FATAL_ERROR "Do not use clang to generate code coverage. Use GCC instead.")
    endif()

externals/tinyxml2/CMakeLists.txt

@@ -17,5 +17,6 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     target_compile_options_safe(tinyxml2_objs -Wno-suggest-destructor-override)
     target_compile_options_safe(tinyxml2_objs -Wno-zero-as-null-pointer-constant)
     target_compile_options_safe(tinyxml2_objs -Wno-format-nonliteral)
+    target_compile_options_safe(tinyxml2_objs -Wno-old-style-cast)
 endif()
 

lib/calculate.h

@@ -36,7 +36,7 @@ inline bool isEqual(double x, double y)
 }
 inline bool isEqual(float x, float y)
 {
-    return isEqual(double{x}, double{y});
+    return isEqual(double(x), double(y));
 }
 
 template<class T>

lib/checkcondition.cpp

@@ -981,7 +981,7 @@ T getvalue3(const T value1, const T value2)
 template<>
 double getvalue3(const double value1, const double value2)
 {
-    return (value1 + value2) / 2.0f;
+    return (value1 + value2) / 2.0;
 }
 
 

lib/valueflow.cpp

@@ -9112,12 +9112,12 @@ static void valueFlowSafeFunctions(TokenList& tokenlist, const SymbolDatabase& s
                     std::list<ValueFlow::Value> argValues;
                     argValues.emplace_back(0);
                     argValues.back().valueType = ValueFlow::Value::ValueType::FLOAT;
-                    argValues.back().floatValue = isLow ? low : -1E25f;
+                    argValues.back().floatValue = isLow ? low : -1E25;
                     argValues.back().errorPath.emplace_back(arg.nameToken(), "Safe checks: Assuming argument has value " + MathLib::toString(argValues.back().floatValue));
                     argValues.back().safe = true;
                     argValues.emplace_back(0);
                     argValues.back().valueType = ValueFlow::Value::ValueType::FLOAT;
-                    argValues.back().floatValue = isHigh ? high : 1E25f;
+                    argValues.back().floatValue = isHigh ? high : 1E25;
                     argValues.back().errorPath.emplace_back(arg.nameToken(), "Safe checks: Assuming argument has value " + MathLib::toString(argValues.back().floatValue));
                     argValues.back().safe = true;
                     valueFlowForward(const_cast<Token*>(functionScope->bodyStart->next()),

test/testvalueflow.cpp

@@ -349,7 +349,7 @@ private:
         return false;
     }
 
-    bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, float value, float diff) {
+    bool testValueOfX_(const char* file, int line, const char code[], unsigned int linenr, double value, double diff) {
         // Tokenize..
         Tokenizer tokenizer(&settings, this);
         std::istringstream istr(code);
@@ -565,7 +565,7 @@ private:
     void valueFlowNumber() {
         ASSERT_EQUALS(123, valueOfTok("x=123;", "123").intvalue);
         ASSERT_EQUALS_DOUBLE(192.0, valueOfTok("x=0x0.3p10;", "0x0.3p10").floatValue, 1e-5); // 3 * 16^-1 * 2^10 = 192
-        ASSERT(std::fabs(valueOfTok("x=0.5;", "0.5").floatValue - 0.5f) < 0.1f);
+        ASSERT(std::fabs(valueOfTok("x=0.5;", "0.5").floatValue - 0.5) < 0.1);
         ASSERT_EQUALS(10, valueOfTok("enum {A=10,B=15}; x=A+0;", "+").intvalue);
         ASSERT_EQUALS(0, valueOfTok("x=false;", "false").intvalue);
         ASSERT_EQUALS(1, valueOfTok("x=true;", "true").intvalue);
@@ -3491,7 +3491,7 @@ private:
     void valueFlowForwardCompoundAssign() {
         const char *code;
 
-        code = "void f() {\n"
+        code = "int f() {\n"
                "    int x = 123;\n"
                "    x += 43;\n"
                "    return x;\n"
@@ -3501,19 +3501,26 @@ private:
                       "3,Compound assignment '+=', assigned value is 166\n",
                       getErrorPathForX(code, 4U));
 
-        code = "void f() {\n"
+        code = "int f() {\n"
                "    int x = 123;\n"
                "    x /= 0;\n" // don't crash when evaluating x/=0
                "    return x;\n"
                "}";
         ASSERT_EQUALS(false, testValueOfX(code, 4U, 123));
 
-        code = "void f() {\n"
+        code = "float f() {\n"
-               "    float x = 123.45;\n"
+               "    float x = 123.45f;\n"
                "    x += 67;\n"
                "    return x;\n"
                "}";
-        ASSERT_EQUALS(true, testValueOfX(code, 4U, 123.45F + 67, 0.01F));
+        ASSERT_EQUALS(true, testValueOfX(code, 4U, (double)123.45f + 67, 0.01));
+
+        code = "double f() {\n"
+               "    double x = 123.45;\n"
+               "    x += 67;\n"
+               "    return x;\n"
+               "}";
+        ASSERT_EQUALS(true, testValueOfX(code, 4U, 123.45 + 67, 0.01));
 
         code = "void f() {\n"
                "    int x = 123;\n"
@@ -3522,7 +3529,7 @@ private:
                "}";
         ASSERT_EQUALS(true, testValueOfX(code, 4U, 61));
 
-        code = "void f() {\n"
+        code = "int f() {\n"
                "    int x = 123;\n"
                "    x <<= 1;\n"
                "    return x;\n"