diff --git a/Makefile b/Makefile
index 8d2d0cc7e73..5570b080a34 100644
--- a/Makefile
+++ b/Makefile
@@ -665,7 +665,7 @@ cli/executor.o: cli/executor.cpp cli/executor.h lib/addoninfo.h lib/checkers.h l
 cli/filelister.o: cli/filelister.cpp cli/filelister.h lib/config.h lib/filesettings.h lib/mathlib.h lib/path.h lib/pathmatch.h lib/platform.h lib/standards.h lib/utils.h
 	$(CXX) ${INCLUDE_FOR_CLI} $(CPPFLAGS) $(CXXFLAGS) -c -o $@ cli/filelister.cpp
 
-cli/main.o: cli/main.cpp cli/cppcheckexecutor.h lib/config.h lib/errortypes.h lib/filesettings.h lib/mathlib.h lib/path.h lib/platform.h lib/standards.h
+cli/main.o: cli/main.cpp cli/cppcheckexecutor.h lib/config.h lib/errortypes.h lib/filesettings.h lib/mathlib.h lib/path.h lib/platform.h lib/standards.h lib/utils.h
 	$(CXX) ${INCLUDE_FOR_CLI} $(CPPFLAGS) $(CXXFLAGS) -c -o $@ cli/main.cpp
 
 cli/processexecutor.o: cli/processexecutor.cpp cli/executor.h cli/processexecutor.h lib/addoninfo.h lib/check.h lib/checkers.h lib/config.h lib/cppcheck.h lib/errorlogger.h lib/errortypes.h lib/filesettings.h lib/library.h lib/mathlib.h lib/path.h lib/platform.h lib/settings.h lib/standards.h lib/suppressions.h lib/timer.h lib/utils.h
diff --git a/cli/cmdlineparser.cpp b/cli/cmdlineparser.cpp
index e09c3e2dd60..f10b55f9aae 100644
--- a/cli/cmdlineparser.cpp
+++ b/cli/cmdlineparser.cpp
@@ -240,12 +240,24 @@ bool CmdLineParser::fillSettingsFromArgs(int argc, const char* const argv[])
             }
         }
 
-        // enforce the language since markup files are special and do not adhere to the enforced language
         for (auto& fs : fileSettings)
         {
             if (mSettings.library.markupFile(fs.filename())) {
+                // enforce the language since markup files are special and do not adhere to the enforced language
                 fs.file.setLang(Standards::Language::C);
             }
+
+            fs.computeHash();
+        }
+
+        if (!mSettings.recheckProjectDuplicates) {
+            auto it = fileSettings.begin();
+            while (it != fileSettings.end()) {
+                fileSettings.erase(std::remove_if(std::next(it), fileSettings.end(), [&](const FileSettings& fs) {
+                    return fs.hash == it->hash;
+                }), fileSettings.end());
+                ++it;
+            }
         }
 
         // sort the markup last
@@ -635,6 +647,9 @@ CmdLineParser::Result CmdLineParser::parseFromArgs(int argc, const char* const a
         else if (std::strcmp(argv[i], "--debug-clang-output") == 0)
             mSettings.debugClangOutput = true;
 
+        else if (std::strcmp(argv[i], "--recheck-project-duplicates") == 0)
+            mSettings.recheckProjectDuplicates = true;
+
         // Show debug messages for ignored files
         else if (std::strcmp(argv[i], "--debug-ignore") == 0)
             mSettings.debugignore = true;
@@ -1702,6 +1717,10 @@ void CmdLineParser::printHelp() const
         "                         be considered for evaluation.\n"
         "    --config-excludes-file=<file>\n"
         "                         A file that contains a list of config-excludes\n"
+        "    --recheck-project-duplicates\n"
+        "                         When using the --project option, files with identical\n"
+        "                         names and compiler flags are deduplicated by default.\n"
+        "                         This option forces cppcheck to check all imported files.\n"
         "    --disable=<id>       Disable individual checks.\n"
         "                         Please refer to the documentation of --enable=<id>\n"
         "                         for further details.\n"
diff --git a/lib/analyzerinfo.cpp b/lib/analyzerinfo.cpp
index 9d5b914c2bd..977d9d05608 100644
--- a/lib/analyzerinfo.cpp
+++ b/lib/analyzerinfo.cpp
@@ -58,10 +58,13 @@ void AnalyzerInformation::writeFilesTxt(const std::string &buildDir, const std::
             fout << afile << ".a" << (++fileCount[afile]) << ":" << userDefines << ":" << Path::simplifyPath(f) << '\n';
     }
 
+    std::ios savedFlags(nullptr);
+    savedFlags.copyfmt(fout);
     for (const FileSettings &fs : fileSettings) {
         const std::string afile = getFilename(fs.filename());
-        fout << afile << ".a" << (++fileCount[afile]) << ":" << fs.cfg << ":" << Path::simplifyPath(fs.filename()) << std::endl;
+        fout << afile << ".a" << (++fileCount[afile]) << ":" << std::hex << fs.hash << ":" << Path::simplifyPath(fs.filename()) << std::endl;
     }
+    fout.copyfmt(savedFlags);
 }
 
 void AnalyzerInformation::close()
@@ -73,7 +76,7 @@ void AnalyzerInformation::close()
     }
 }
 
-static bool skipAnalysis(const std::string &analyzerInfoFile, std::size_t hash, std::list<ErrorMessage> &errors)
+static bool skipAnalysis(const std::string &analyzerInfoFile, std::size_t filehash, std::list<ErrorMessage> &errors)
 {
     tinyxml2::XMLDocument doc;
     const tinyxml2::XMLError error = doc.LoadFile(analyzerInfoFile.c_str());
@@ -85,7 +88,7 @@ static bool skipAnalysis(const std::string &analyzerInfoFile, std::size_t hash,
         return false;
 
     const char *attr = rootNode->Attribute("hash");
-    if (!attr || attr != std::to_string(hash))
+    if (!attr || attr != std::to_string(filehash))
         return false;
 
     for (const tinyxml2::XMLElement *e = rootNode->FirstChildElement(); e; e = e->NextSiblingElement()) {
@@ -96,10 +99,10 @@ static bool skipAnalysis(const std::string &analyzerInfoFile, std::size_t hash,
     return true;
 }
 
-std::string AnalyzerInformation::getAnalyzerInfoFileFromFilesTxt(std::istream& filesTxt, const std::string &sourcefile, const std::string &cfg)
+std::string AnalyzerInformation::getAnalyzerInfoFileFromFilesTxt(std::istream& filesTxt, const std::string &sourcefile, const std::string &cfghash)
 {
     std::string line;
-    const std::string end(':' + cfg + ':' + Path::simplifyPath(sourcefile));
+    const std::string end(':' + cfghash + ':' + Path::simplifyPath(sourcefile));
     while (std::getline(filesTxt,line)) {
         if (line.size() <= end.size() + 2U)
             continue;
@@ -110,11 +113,11 @@ std::string AnalyzerInformation::getAnalyzerInfoFileFromFilesTxt(std::istream& f
     return "";
 }
 
-std::string AnalyzerInformation::getAnalyzerInfoFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfg)
+std::string AnalyzerInformation::getAnalyzerInfoFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfghash)
 {
     std::ifstream fin(Path::join(buildDir, "files.txt"));
     if (fin.is_open()) {
-        const std::string& ret = getAnalyzerInfoFileFromFilesTxt(fin, sourcefile, cfg);
+        const std::string& ret = getAnalyzerInfoFileFromFilesTxt(fin, sourcefile, cfghash);
         if (!ret.empty())
             return Path::join(buildDir, ret);
     }
@@ -128,21 +131,21 @@ std::string AnalyzerInformation::getAnalyzerInfoFile(const std::string &buildDir
     return Path::join(buildDir, filename) + ".analyzerinfo";
 }
 
-bool AnalyzerInformation::analyzeFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfg, std::size_t hash, std::list<ErrorMessage> &errors)
+bool AnalyzerInformation::analyzeFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfgHash, std::size_t fileHash, std::list<ErrorMessage> &errors)
 {
     if (buildDir.empty() || sourcefile.empty())
         return true;
     close();
 
-    mAnalyzerInfoFile = AnalyzerInformation::getAnalyzerInfoFile(buildDir,sourcefile,cfg);
+    mAnalyzerInfoFile = AnalyzerInformation::getAnalyzerInfoFile(buildDir,sourcefile,cfgHash);
 
-    if (skipAnalysis(mAnalyzerInfoFile, hash, errors))
+    if (skipAnalysis(mAnalyzerInfoFile, fileHash, errors))
         return false;
 
     mOutputStream.open(mAnalyzerInfoFile);
     if (mOutputStream.is_open()) {
         mOutputStream << "<?xml version=\"1.0\"?>\n";
-        mOutputStream << "<analyzerinfo hash=\"" << hash << "\">\n";
+        mOutputStream << "<analyzerinfo hash=\"" << fileHash << "\">\n";
     } else {
         mAnalyzerInfoFile.clear();
     }
diff --git a/lib/analyzerinfo.h b/lib/analyzerinfo.h
index 04f41ac4e99..3403570d284 100644
--- a/lib/analyzerinfo.h
+++ b/lib/analyzerinfo.h
@@ -55,12 +55,12 @@ class CPPCHECKLIB AnalyzerInformation {
 
     /** Close current TU.analyzerinfo file */
     void close();
-    bool analyzeFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfg, std::size_t hash, std::list<ErrorMessage> &errors);
+    bool analyzeFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfgHash, std::size_t fileHash, std::list<ErrorMessage> &errors);
     void reportErr(const ErrorMessage &msg);
     void setFileInfo(const std::string &check, const std::string &fileInfo);
-    static std::string getAnalyzerInfoFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfg);
+    static std::string getAnalyzerInfoFile(const std::string &buildDir, const std::string &sourcefile, const std::string &cfghash);
 protected:
-    static std::string getAnalyzerInfoFileFromFilesTxt(std::istream& filesTxt, const std::string &sourcefile, const std::string &cfg);
+    static std::string getAnalyzerInfoFileFromFilesTxt(std::istream& filesTxt, const std::string &sourcefile, const std::string &cfghash);
 private:
     std::ofstream mOutputStream;
     std::string mAnalyzerInfoFile;
diff --git a/lib/cppcheck.cpp b/lib/cppcheck.cpp
index 7024969117a..9caf6b62a53 100644
--- a/lib/cppcheck.cpp
+++ b/lib/cppcheck.cpp
@@ -331,13 +331,17 @@ static std::vector<std::string> split(const std::string &str, const std::string
     return ret;
 }
 
-static std::string getDumpFileName(const Settings& settings, const std::string& filename)
+static std::string getDumpFileName(const Settings& settings, const std::string& filename, const std::string &cfgHash = "")
 {
     std::string extension;
-    if (settings.dump || !settings.buildDir.empty())
-        extension = ".dump";
-    else
-        extension = "." + std::to_string(settings.pid) + ".dump";
+
+    if (!settings.dump && settings.buildDir.empty())
+        extension += "." + std::to_string(settings.pid);
+
+    if (!cfgHash.empty())
+        extension += "." + cfgHash;
+
+    extension += ".dump";
 
     if (!settings.dump && !settings.buildDir.empty())
         return AnalyzerInformation::getAnalyzerInfoFile(settings.buildDir, filename, "") + extension;
@@ -352,11 +356,12 @@ static std::string getCtuInfoFileName(const std::string &dumpFile)
 static void createDumpFile(const Settings& settings,
                            const FileWithDetails& file,
                            std::ofstream& fdump,
-                           std::string& dumpFile)
+                           std::string& dumpFile,
+                           const std::string &cfgHash = "")
 {
     if (!settings.dump && settings.addons.empty())
         return;
-    dumpFile = getDumpFileName(settings, file.spath());
+    dumpFile = getDumpFileName(settings, file.spath(), cfgHash);
 
     fdump.open(dumpFile);
     if (!fdump.is_open())
@@ -775,7 +780,7 @@ unsigned int CppCheck::check(const FileWithDetails &file)
 unsigned int CppCheck::check(const FileWithDetails &file, const std::string &content)
 {
     std::istringstream iss(content);
-    return checkFile(file, "", &iss);
+    return checkFile(file, "", "", &iss);
 }
 
 unsigned int CppCheck::check(const FileSettings &fs)
@@ -811,7 +816,9 @@ unsigned int CppCheck::check(const FileSettings &fs)
     }
     // need to pass the externally provided ErrorLogger instead of our internal wrapper
     CppCheck temp(tempSettings, mSuppressions, mErrorLoggerDirect, mUseGlobalSuppressions, mExecuteCommand);
-    const unsigned int returnValue = temp.checkFile(fs.file, fs.cfg);
+    std::stringstream hash;
+    hash << std::hex << fs.hash;
+    const unsigned int returnValue = temp.checkFile(fs.file, fs.cfg, hash.str());
     if (mUnusedFunctionsCheck)
         mUnusedFunctionsCheck->updateFunctionData(*temp.mUnusedFunctionsCheck);
     while (!temp.mFileInfo.empty()) {
@@ -846,7 +853,7 @@ static std::size_t calculateHash(const Preprocessor& preprocessor, const simplec
     return preprocessor.calculateHash(tokens, toolinfo.str());
 }
 
-unsigned int CppCheck::checkFile(const FileWithDetails& file, const std::string &cfgname, std::istream* fileStream)
+unsigned int CppCheck::checkFile(const FileWithDetails& file, const std::string &cfgname, const std::string &cfgHash, std::istream* fileStream)
 {
     // TODO: move to constructor when CppCheck no longer owns the settings
     if (mSettings.checks.isEnabled(Checks::unusedFunction) && !mUnusedFunctionsCheck)
@@ -995,9 +1002,9 @@ unsigned int CppCheck::checkFile(const FileWithDetails& file, const std::string
 
         if (analyzerInformation) {
             // Calculate hash so it can be compared with old hash / future hashes
-            const std::size_t hash = calculateHash(preprocessor, tokens1, mSettings, mSuppressions);
+            const std::size_t fileHash = calculateHash(preprocessor, tokens1, mSettings, mSuppressions);
             std::list<ErrorMessage> errors;
-            if (!analyzerInformation->analyzeFile(mSettings.buildDir, file.spath(), cfgname, hash, errors)) {
+            if (!analyzerInformation->analyzeFile(mSettings.buildDir, file.spath(), cfgHash, fileHash, errors)) {
                 while (!errors.empty()) {
                     mErrorLogger.reportErr(errors.front());
                     errors.pop_front();
@@ -1061,7 +1068,7 @@ unsigned int CppCheck::checkFile(const FileWithDetails& file, const std::string
         // write dump file xml prolog
         std::ofstream fdump;
         std::string dumpFile;
-        createDumpFile(mSettings, file, fdump, dumpFile);
+        createDumpFile(mSettings, file, fdump, dumpFile, cfgHash);
         if (fdump.is_open()) {
             fdump << getLibraryDumpData();
             fdump << dumpProlog;
@@ -1794,7 +1801,9 @@ void CppCheck::executeAddonsWholeProgram(const std::list<FileWithDetails> &files
     }
 
     for (const auto &f: fileSettings) {
-        const std::string &dumpFileName = getDumpFileName(mSettings, f.filename());
+        std::stringstream hash;
+        hash << std::hex << f.hash;
+        const std::string &dumpFileName = getDumpFileName(mSettings, f.filename(), hash.str());
         ctuInfoFiles.push_back(getCtuInfoFileName(dumpFileName));
     }
 
diff --git a/lib/cppcheck.h b/lib/cppcheck.h
index ea7feeebd55..0cd4b3a1483 100644
--- a/lib/cppcheck.h
+++ b/lib/cppcheck.h
@@ -174,7 +174,7 @@ class CPPCHECKLIB CppCheck {
      * @param fileStream stream the file content can be read from
      * @return number of errors found
      */
-    unsigned int checkFile(const FileWithDetails& file, const std::string &cfgname, std::istream* fileStream = nullptr);
+    unsigned int checkFile(const FileWithDetails& file, const std::string &cfgname, const std::string &cfgHash = "", std::istream* fileStream = nullptr);
 
     /**
      * @brief Check normal tokens
diff --git a/lib/filesettings.h b/lib/filesettings.h
index b04f4a1af9e..0ad3aeeea38 100644
--- a/lib/filesettings.h
+++ b/lib/filesettings.h
@@ -23,6 +23,7 @@
 #include "path.h"
 #include "platform.h"
 #include "standards.h"
+#include "utils.h"
 
 #include <list>
 #include <set>
@@ -82,12 +83,42 @@ class FileWithDetails
 struct CPPCHECKLIB FileSettings {
     explicit FileSettings(std::string path)
         : file(std::move(path))
+        , hash(0)
     {}
 
     FileSettings(std::string path, Standards::Language lang, std::size_t size)
         : file(std::move(path), lang, size)
+        , hash(0)
     {}
 
+    void computeHash() {
+        hash = std::hash<std::string>{}(file.path());
+
+        hash ^= std::hash<std::string>{}(standard);
+
+        for (const auto &undef : undefs) {
+            hash = rotateLeft(hash, 1);
+            hash ^= std::hash<std::string>{}(undef);
+        }
+
+        for (const auto &includePath : includePaths) {
+            hash = rotateLeft(hash, 1);
+            hash ^= std::hash<std::string>{}(includePath);
+        }
+
+        for (const auto &systemIncludePath : systemIncludePaths) {
+            hash = rotateLeft(hash, 1);
+            hash ^= std::hash<std::string>{}(systemIncludePath);
+        }
+
+        for (const auto &define : splitString(defines, ';')) {
+            hash = rotateLeft(hash, 1);
+            hash ^= std::hash<std::string>{}(define);
+        }
+
+        hash ^= std::hash<std::string>{}(cfg);
+    }
+
     std::string cfg;
     FileWithDetails file;
     const std::string& filename() const
@@ -110,6 +141,7 @@ struct CPPCHECKLIB FileSettings {
     std::list<std::string> systemIncludePaths;
     std::string standard;
     Platform::Type platformType = Platform::Type::Unspecified;
+    std::size_t hash;
     // TODO: get rid of these
     bool msc{};
     bool useMfc{};
diff --git a/lib/settings.h b/lib/settings.h
index 930b8776d18..2c950eb7e6d 100644
--- a/lib/settings.h
+++ b/lib/settings.h
@@ -220,6 +220,9 @@ class CPPCHECKLIB WARN_UNUSED Settings {
     /** @brief Do not filter duplicated errors. */
     bool emitDuplicates{};
 
+    /** @brief Recheck project files with identical path and config. */
+    bool recheckProjectDuplicates{};
+
     /** @brief Name of the language that is enforced. Empty per default. */
     Standards::Language enforcedLang{};
 
diff --git a/lib/utils.h b/lib/utils.h
index 18146e91043..5f3d50f59f2 100644
--- a/lib/utils.h
+++ b/lib/utils.h
@@ -397,6 +397,12 @@ static inline T* empty_if_null(T* p)
     return default_if_null(p, "");
 }
 
+template<typename T>
+static inline T rotateLeft(T value, std::size_t amount)
+{
+    return (value << amount) | (value >> ((8 * sizeof(T)) - (amount % (8 * sizeof(T)))));
+}
+
 /**
  * Split string by given sperator.
  * @param str The string to split
diff --git a/man/cppcheck.1.xml b/man/cppcheck.1.xml
index 1265e0f3511..cad94bdd3f0 100644
--- a/man/cppcheck.1.xml
+++ b/man/cppcheck.1.xml
@@ -150,6 +150,9 @@ man(1), man(7), http://www.tldp.org/HOWTO/Man-Page/
       <arg choice="opt">
         <option>--config-excludes-file=&lt;file&gt;</option>
       </arg>
+      <arg choice="opt">
+        <option>--recheck-project-duplicates</option>
+      </arg>
       <arg choice="opt">
         <option>--include=&lt;file&gt;</option>
       </arg>
@@ -441,6 +444,14 @@ First given path is searched for contained header files first. If paths are rela
           <para>A file that contains a list of config-excludes.</para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term>
+          <option>--recheck-project-duplicates</option>
+        </term>
+        <listitem>
+          <para>When using the --project option, files with identical names and compiler flags are deduplicated by default. This option forces cppcheck to check all imported files.</para>
+        </listitem>
+      </varlistentry>
       <varlistentry>
         <term>
           <option>--include=&lt;file&gt;</option>
diff --git a/test/cli/duplicates/compile_commands_duplicates.json b/test/cli/duplicates/compile_commands_duplicates.json
new file mode 100644
index 00000000000..4b1b0dea974
--- /dev/null
+++ b/test/cli/duplicates/compile_commands_duplicates.json
@@ -0,0 +1,12 @@
+[
+{
+  "directory": "./.",
+  "command": "/usr/bin/c++  -std=gnu++11 -c ./main.cpp",
+  "file": "./main.cpp"
+},
+{
+  "directory": "./.",
+  "command": "/usr/bin/c++ -std=gnu++11 -c ./main.cpp",
+  "file": "./main.cpp"
+}
+]
diff --git a/test/cli/duplicates/compile_commands_no_duplicates.json b/test/cli/duplicates/compile_commands_no_duplicates.json
new file mode 100644
index 00000000000..95a7d686e10
--- /dev/null
+++ b/test/cli/duplicates/compile_commands_no_duplicates.json
@@ -0,0 +1,12 @@
+[
+{
+  "directory": "./.",
+  "command": "/usr/bin/c++  -std=gnu++11 -c ./main.cpp",
+  "file": "./main.cpp"
+},
+{
+  "directory": "./.",
+  "command": "/usr/bin/c++ -DHELLO -std=gnu++11 -c ./main.cpp",
+  "file": "./main.cpp"
+}
+]
diff --git a/test/cli/duplicates/main.cpp b/test/cli/duplicates/main.cpp
new file mode 100644
index 00000000000..17e5b891736
--- /dev/null
+++ b/test/cli/duplicates/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main(int argc, char **argv)
+{
+    std::cout << "Hello, world!" << std::endl;
+}
diff --git a/test/cli/duplicates_test.py b/test/cli/duplicates_test.py
new file mode 100644
index 00000000000..8a54fe60938
--- /dev/null
+++ b/test/cli/duplicates_test.py
@@ -0,0 +1,52 @@
+
+# python -m pytest test-helloworld.py
+
+import os
+
+from testutils import cppcheck
+
+__script_dir = os.path.dirname(os.path.abspath(__file__))
+__proj_dir = os.path.join(__script_dir, 'duplicates')
+
+def test_project_duplicates():
+    args = ['--project=compile_commands_duplicates.json']
+    ret, stdout, _ = cppcheck(args, cwd=__proj_dir)
+    assert ret == 0
+    assert stdout.count('main.cpp') == 1
+
+def test_project_duplicates_recheck():
+    args = [
+        '--project=compile_commands_duplicates.json',
+        '--recheck-project-duplicates'
+    ]
+    ret, stdout, _ = cppcheck(args, cwd=__proj_dir)
+    assert ret == 0
+    assert stdout.count('main.cpp') > 1
+
+def test_project_no_duplicates():
+    args = ['--project=compile_commands_no_duplicates.json']
+    ret, stdout, _ = cppcheck(args, cwd=__proj_dir)
+    assert ret == 0
+    assert stdout.count('main.cpp') > 1
+
+def test_project_duplicates_builddir(tmpdir):
+    args = [
+        '--project=compile_commands_duplicates.json',
+        f'--cppcheck-build-dir={tmpdir}'
+    ]
+    ret, _, _ = cppcheck(args, cwd=__proj_dir)
+    assert ret == 0
+    files = os.listdir(tmpdir)
+    assert 'main.a1' in files
+    assert 'main.a2' not in files
+
+def test_project_no_duplicates_builddir(tmpdir):
+    args = [
+        '--project=compile_commands_no_duplicates.json',
+        f'--cppcheck-build-dir={tmpdir}'
+    ]
+    ret, _, _ = cppcheck(args, cwd=__proj_dir)
+    assert ret == 0
+    files = os.listdir(tmpdir)
+    assert 'main.a1' in files
+    assert 'main.a2' in files
diff --git a/test/testutils.cpp b/test/testutils.cpp
index d1150b7b0d2..44a6d7f8dfd 100644
--- a/test/testutils.cpp
+++ b/test/testutils.cpp
@@ -44,6 +44,7 @@ class TestUtils : public TestFixture {
         TEST_CASE(splitString);
         TEST_CASE(as_const);
         TEST_CASE(memoize);
+        TEST_CASE(rotateLeft);
     }
 
     void isValidGlobPattern() const {
@@ -535,6 +536,14 @@ class TestUtils : public TestFixture {
         ASSERT_EQUALS(1, callF());
         ASSERT_EQUALS(1, count);
     }
+
+    void rotateLeft() const {
+        uint8_t value_u8 = 0x55;
+        ASSERT_EQUALS(::rotateLeft(value_u8, 1), 0xAA);
+
+        uint64_t value_u64 = 0xABCDEF0123456789;
+        ASSERT_EQUALS(::rotateLeft(value_u64, 8), 0xCDEF0123456789AB);
+    }
 };
 
 REGISTER_TEST(TestUtils)