Clang: Always force the built-in includes order

C++ includes must always come first, then clang resource
directory and then everything else.
This prevents both c++ standard headers and intrinsics issues.

Change-Id: Ia21bfa2fe99884c9adf58f7ef6beba1bede1724b
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/cpptools/compileroptionsbuilder.cpp

@@ -221,39 +221,43 @@ static QString clangIncludeDirectory(const QString &clangVersion,
 #endif
 }
 
-static int lastIncludeIndex(const QStringList &options, const QRegularExpression &includePathRegEx)
+static QStringList insertResourceDirectory(const QStringList &options,
-{
+                                           const QString &resourceDir,
-    int index = options.lastIndexOf(includePathRegEx);
+                                           bool isMacOs = false)
-
-    while (index > 0 && options[index - 1] != "-I" && options[index - 1] != "-isystem")
-        index = options.lastIndexOf(includePathRegEx, index - 1);
-
-    if (index == 0)
-        index = -1;
-
-    return index;
-}
-
-static int includeIndexForResourceDirectory(const QStringList &options, bool isMacOs = false)
 {
     // include/c++, include/g++, libc++\include and libc++abi\include
     static const QString cppIncludes = R"((.*[\/\\]include[\/\\].*(g\+\+|c\+\+).*))"
                                        R"(|(.*libc\+\+[\/\\]include))"
                                        R"(|(.*libc\+\+abi[\/\\]include))";
-    static const QRegularExpression includeRegExp("\\A(" + cppIncludes + ")\\z");
 
+    QStringList optionsBeforeResourceDirectory;
+    QStringList optionsAfterResourceDirectory;
+    QRegularExpression includeRegExp;
+    if (!isMacOs) {
+        includeRegExp = QRegularExpression("\\A(" + cppIncludes + ")\\z");
+    } else {
         // The same as includeRegExp but also matches /usr/local/include
-    static const QRegularExpression includeRegExpMac(
+        includeRegExp = QRegularExpression(
             "\\A(" + cppIncludes + R"(|([\/\\]usr[\/\\]local[\/\\]include))" + ")\\z");
+    }
 
-    const int cppIncludeIndex = lastIncludeIndex(options, isMacOs
+    for (const QString &option : options) {
-                                                 ? includeRegExpMac
+        if (option == "-isystem")
-                                                 : includeRegExp);
+            continue;
 
-    if (cppIncludeIndex > 0)
+        if (includeRegExp.match(option).hasMatch()) {
-        return cppIncludeIndex + 1;
+            optionsBeforeResourceDirectory.push_back("-isystem");
+            optionsBeforeResourceDirectory.push_back(option);
+        } else {
+            optionsAfterResourceDirectory.push_back("-isystem");
+            optionsAfterResourceDirectory.push_back(option);
+        }
+    }
 
-    return -1;
+    optionsBeforeResourceDirectory.push_back("-isystem");
+    optionsBeforeResourceDirectory.push_back(resourceDir);
+
+    return optionsBeforeResourceDirectory + optionsAfterResourceDirectory;
 }
 
 void CompilerOptionsBuilder::insertWrappedQtHeaders()
@@ -325,16 +329,11 @@ void CompilerOptionsBuilder::addHeaderPathOptions()
 
         const QString clangIncludePath
                 = clangIncludeDirectory(m_clangVersion, m_clangResourceDirectory);
-        int includeIndexForResourceDir = includeIndexForResourceDirectory(
-                    builtInIncludes, m_projectPart.toolChainTargetTriple.contains("darwin"));
 
-        if (includeIndexForResourceDir >= 0) {
+        builtInIncludes = insertResourceDirectory(builtInIncludes,
-            builtInIncludes.insert(includeIndexForResourceDir, clangIncludePath);
+                                                  clangIncludePath,
-            builtInIncludes.insert(includeIndexForResourceDir, "-isystem");
+                                                  m_projectPart.toolChainTargetTriple.contains(
-        } else {
+                                                      "darwin"));
-            builtInIncludes.prepend(clangIncludePath);
-            builtInIncludes.prepend("-isystem");
-        }
     }
 
     m_options.append(builtInIncludes);

tests/unit/unittest/compileroptionsbuilder-test.cpp

@@ -231,50 +231,16 @@ TEST_F(CompilerOptionsBuilder, ClangHeadersAndCppIncludesPathsOrderLinux)
 }
 
 TEST_F(CompilerOptionsBuilder, ClangHeadersAndCppIncludesPathsOrderNoVersion)
-{
-    projectPart.headerPaths = {HeaderPath{"C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include", HeaderPathType::BuiltIn},
-                               HeaderPath{"C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include\\c++", HeaderPathType::BuiltIn},
-                               HeaderPath{"C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include\\c++\\i686-w64-mingw32", HeaderPathType::BuiltIn},
-                               HeaderPath{"C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include\\c++\\backward", HeaderPathType::BuiltIn}
-                              };
-    projectPart.toolChainTargetTriple = "x86_64-w64-windows-gnu";
-    CppTools::CompilerOptionsBuilder compilerOptionsBuilder(projectPart,
-                                                            CppTools::UseSystemHeader::No,
-                                                            CppTools::SkipBuiltIn::No,
-                                                            CppTools::SkipLanguageDefines::Yes,
-                                                            "7.0.0",
-                                                            "");
-
-    compilerOptionsBuilder.addHeaderPathOptions();
-
-    ASSERT_THAT(compilerOptionsBuilder.options(),
-                ElementsAre("-nostdinc",
-                            "-nostdlibinc",
-                            "-isystem", QDir::toNativeSeparators("C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include"),
-                            "-isystem", QDir::toNativeSeparators("C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include\\c++"),
-                            "-isystem", QDir::toNativeSeparators("C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include\\c++\\i686-w64-mingw32"),
-                            "-isystem", QDir::toNativeSeparators("C:\\Qt\\Tools\\mingw530_32\\i686-w64-mingw32\\include\\c++\\backward"),
-                            "-isystem", QDir::toNativeSeparators(CLANG_RESOURCE_DIR "")));
-}
-
-TEST_F(CompilerOptionsBuilder, ClangHeadersAndCppIncludesPathsOrderAndroidClang)
 {
     projectPart.headerPaths = {
-        HeaderPath{
+        HeaderPath{"C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include", HeaderPathType::BuiltIn},
-            "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sysroot\\usr\\include\\i686-linux-android",
+        HeaderPath{"C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include/c++",
                    HeaderPathType::BuiltIn},
-        HeaderPath{
+        HeaderPath{"C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include/c++/i686-w64-mingw32",
-            "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sources\\cxx-stl\\llvm-libc++\\include",
                    HeaderPathType::BuiltIn},
-        HeaderPath{
+        HeaderPath{"C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include/c++/backward",
-            "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sources\\android\\support\\include",
-            HeaderPathType::BuiltIn},
-        HeaderPath{
-            "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sources\\cxx-stl\\llvm-libc++abi\\include",
-            HeaderPathType::BuiltIn},
-        HeaderPath{"C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sysroot\\usr\\include",
                    HeaderPathType::BuiltIn}};
-    projectPart.toolChainTargetTriple = "i686-linux-android";
+    projectPart.toolChainTargetTriple = "x86_64-w64-windows-gnu";
     CppTools::CompilerOptionsBuilder compilerOptionsBuilder(projectPart,
                                                             CppTools::UseSystemHeader::No,
                                                             CppTools::SkipBuiltIn::No,
@@ -290,22 +256,68 @@ TEST_F(CompilerOptionsBuilder, ClangHeadersAndCppIncludesPathsOrderAndroidClang)
             "-nostdinc",
             "-nostdlibinc",
             "-isystem",
-            QDir::toNativeSeparators(
+            QDir::toNativeSeparators("C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include/c++"),
-                "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sysroot\\usr\\include\\i686-linux-android"),
             "-isystem",
             QDir::toNativeSeparators(
-                "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sources\\cxx-stl\\llvm-libc++\\include"),
+                "C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include/c++/i686-w64-mingw32"),
             "-isystem",
             QDir::toNativeSeparators(
-                "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sources\\android\\support\\include"),
+                "C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include/c++/backward"),
-            "-isystem",
-            QDir::toNativeSeparators(
-                "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sources\\cxx-stl\\llvm-libc++abi\\include"),
             "-isystem",
             QDir::toNativeSeparators(CLANG_RESOURCE_DIR ""),
             "-isystem",
-            QDir::toNativeSeparators(
+            QDir::toNativeSeparators("C:/Qt/Tools/mingw530_32/i686-w64-mingw32/include")));
-                "C:\\Users\\test\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sysroot\\usr\\include")));
+}
+
+TEST_F(CompilerOptionsBuilder, ClangHeadersAndCppIncludesPathsOrderAndroidClang)
+{
+    projectPart.headerPaths
+        = {HeaderPath{"C:/Users/test/AppData/Local/Android/sdk/ndk-"
+                      "bundle/sysroot/usr/include/i686-linux-android",
+                      HeaderPathType::BuiltIn},
+           HeaderPath{"C:/Users/test/AppData/Local/Android/sdk/ndk-bundle/sources/cxx-"
+                      "stl/llvm-libc++/include",
+                      HeaderPathType::BuiltIn},
+           HeaderPath{"C:/Users/test/AppData/Local/Android/sdk/ndk-"
+                      "bundle/sources/android/support/include",
+                      HeaderPathType::BuiltIn},
+           HeaderPath{"C:/Users/test/AppData/Local/Android/sdk/ndk-bundle/sources/cxx-"
+                      "stl/llvm-libc++abi/include",
+                      HeaderPathType::BuiltIn},
+           HeaderPath{
+               "C:/Users/test/AppData/Local/Android/sdk/ndk-bundle/sysroot/usr/include",
+               HeaderPathType::BuiltIn}};
+    projectPart.toolChainTargetTriple = "i686-linux-android";
+    CppTools::CompilerOptionsBuilder compilerOptionsBuilder(projectPart,
+                                                            CppTools::UseSystemHeader::No,
+                                                            CppTools::SkipBuiltIn::No,
+                                                            CppTools::SkipLanguageDefines::Yes,
+                                                            "7.0.0",
+                                                            "");
+
+    compilerOptionsBuilder.addHeaderPathOptions();
+
+    ASSERT_THAT(
+        compilerOptionsBuilder.options(),
+        ElementsAre("-nostdinc",
+                    "-nostdlibinc",
+                    "-isystem",
+                    QDir::toNativeSeparators("C:/Users/test/AppData/Local/Android/sdk/ndk-"
+                                             "bundle/sources/cxx-stl/llvm-libc++/include"),
+                    "-isystem",
+                    QDir::toNativeSeparators("C:/Users/test/AppData/Local/Android/sdk/ndk-"
+                                             "bundle/sources/cxx-stl/llvm-libc++abi/include"),
+                    "-isystem",
+                    QDir::toNativeSeparators(CLANG_RESOURCE_DIR ""),
+                    "-isystem",
+                    QDir::toNativeSeparators("C:/Users/test/AppData/Local/Android/sdk/ndk-"
+                                             "bundle/sysroot/usr/include/i686-linux-android"),
+                    "-isystem",
+                    QDir::toNativeSeparators("C:/Users/test/AppData/Local/Android/sdk/ndk-"
+                                             "bundle/sources/android/support/include"),
+                    "-isystem",
+                    QDir::toNativeSeparators("C:/Users/test/AppData/Local/Android/sdk/ndk-"
+                                             "bundle/sysroot/usr/include")));
 }
 
 TEST_F(CompilerOptionsBuilder, NoPrecompiledHeader)