diff --git a/.github/workflows/selfcheck.yml b/.github/workflows/selfcheck.yml
index 6d100c4ddc8..1a213039f93 100644
--- a/.github/workflows/selfcheck.yml
+++ b/.github/workflows/selfcheck.yml
@@ -121,7 +121,7 @@ jobs:
 
       - name: Self check (unusedFunction / no test / no gui)
         run: |
-          supprs="--suppress=unusedFunction:lib/errorlogger.h:197 --suppress=unusedFunction:lib/importproject.cpp:1671 --suppress=unusedFunction:lib/importproject.cpp:1695"
+          supprs="--suppress=unusedFunction:lib/errorlogger.h:198 --suppress=unusedFunction:lib/importproject.cpp:1671 --suppress=unusedFunction:lib/importproject.cpp:1695"
           ./cppcheck -q --template=selfcheck --error-exitcode=1 --library=cppcheck-lib -D__CPPCHECK__ -D__GNUC__ --enable=unusedFunction,information --exception-handling -rp=. --project=cmake.output.notest_nogui/compile_commands.json --suppressions-list=.selfcheck_unused_suppressions --inline-suppr $supprs
         env:
           DISABLE_VALUEFLOW: 1
diff --git a/.selfcheck_suppressions b/.selfcheck_suppressions
index f21492e783a..63d33fd2704 100644
--- a/.selfcheck_suppressions
+++ b/.selfcheck_suppressions
@@ -62,6 +62,8 @@ templateInstantiation:test/testutils.cpp
 
 naming-varname:externals/simplecpp/simplecpp.h
 naming-privateMemberVariable:externals/simplecpp/simplecpp.h
+# false positive; lambda captures its owner
+danglingLifetime:externals/simplecpp/simplecpp.h:505
 
 # TODO: these warnings need to be addressed upstream
 uninitMemberVar:externals/tinyxml2/tinyxml2.h
diff --git a/lib/cppcheck.cpp b/lib/cppcheck.cpp
index 50f7fa36e80..26d98c0c7b4 100644
--- a/lib/cppcheck.cpp
+++ b/lib/cppcheck.cpp
@@ -61,6 +61,7 @@
 #include <exception> // IWYU pragma: keep
 #include <fstream>
 #include <iostream>
+#include <iterator>
 #include <map>
 #include <new>
 #include <set>
@@ -100,9 +101,9 @@ class CppCheck::CppCheckLogger : public ErrorLogger
         closePlist();
     }
 
-    void setRemarkComments(std::vector<RemarkComment> remarkComments)
+    void addRemarkComments(const std::vector<RemarkComment> &remarkComments)
     {
-        mRemarkComments = std::move(remarkComments);
+        mRemarkComments.insert(mRemarkComments.end(), remarkComments.begin(), remarkComments.end());
     }
 
     void setLocationMacros(const Token* startTok, const std::vector<std::string>& files)
@@ -124,17 +125,25 @@ class CppCheck::CppCheckLogger : public ErrorLogger
         mErrorList.clear();
     }
 
-    void openPlist(const std::string& filename, const std::vector<std::string>& files)
+    void openPlist(const std::string& filename)
     {
         mPlistFile.open(filename);
-        mPlistFile << ErrorLogger::plistHeader(version(), files);
+        mPlistFile << ErrorLogger::plistHeader(version());
+    }
+
+    void setPlistFilenames(std::vector<std::string> files)
+    {
+        if (mPlistFile.is_open()) {
+            mPlistFilenames = std::move(files);
+        }
     }
 
     void closePlist()
     {
         if (mPlistFile.is_open()) {
-            mPlistFile << ErrorLogger::plistFooter();
+            mPlistFile << ErrorLogger::plistFooter(mPlistFilenames);
             mPlistFile.close();
+            mPlistFilenames.clear();
         }
     }
 
@@ -282,6 +291,7 @@ class CppCheck::CppCheckLogger : public ErrorLogger
     std::map<Location, std::set<std::string>> mLocationMacros; // What macros are used on a location?
 
     std::ofstream mPlistFile;
+    std::vector<std::string> mPlistFilenames;
 
     unsigned int mExitCode{};
 
@@ -898,7 +908,7 @@ unsigned int CppCheck::checkFile(const FileWithDetails& file, const std::string
     return checkInternal(file, cfgname, f);
 }
 
-void CppCheck::checkPlistOutput(const FileWithDetails& file, const std::vector<std::string>& files)
+void CppCheck::checkPlistOutput(const FileWithDetails& file)
 {
     if (!mSettings.plistOutput.empty()) {
         const bool slashFound = file.spath().find('/') != std::string::npos;
@@ -909,7 +919,7 @@ void CppCheck::checkPlistOutput(const FileWithDetails& file, const std::vector<s
         // the hash is added to handle when files in different folders have the same name
         const std::size_t fileNameHash = std::hash<std::string> {}(file.spath());
         filename = mSettings.plistOutput + noSuffixFilename + "_" + std::to_string(fileNameHash) + ".plist";
-        mLogger->openPlist(filename, files);
+        mLogger->openPlist(filename);
     }
 }
 
@@ -1000,24 +1010,16 @@ unsigned int CppCheck::checkInternal(const FileWithDetails& file, const std::str
         if (preprocessor.reportOutput(outputList, true))
             return mLogger->exitcode();
 
-        if (!preprocessor.loadFiles(files))
-            return mLogger->exitcode();
-
-        checkPlistOutput(file, files);
+        checkPlistOutput(file);
 
-        std::string dumpProlog;
+        std::string dumpFooter;
         if (mSettings.dump || !mSettings.addons.empty()) {
-            dumpProlog += getDumpFileContentsRawTokens(files, tokens1);
+            dumpFooter += getDumpFileContentsRawTokensFooter(tokens1);
         }
 
         // Parse comments and then remove them
-        mLogger->setRemarkComments(preprocessor.getRemarkComments());
+        mLogger->addRemarkComments(preprocessor.getRemarkComments());
         preprocessor.inlineSuppressions(mSuppressions.nomsg);
-        if (mSettings.dump || !mSettings.addons.empty()) {
-            std::ostringstream oss;
-            mSuppressions.nomsg.dump(oss);
-            dumpProlog += oss.str();
-        }
         preprocessor.removeComments();
 
         if (!mSettings.buildDir.empty()) {
@@ -1040,19 +1042,45 @@ unsigned int CppCheck::checkInternal(const FileWithDetails& file, const std::str
         }
 
         // Get directives
-        std::list<Directive> directives = preprocessor.createDirectives();
+        std::list<Directive> directives;
+        preprocessor.createDirectives(directives);
         preprocessor.simplifyPragmaAsm();
 
+        std::set<std::string> configurations;
+        std::set<std::string> configDefines = { "__cplusplus" };
+
+        // Insert library defines
+        const auto getDefineName = [](const std::string &defineString) {
+            return defineString.substr(0, defineString.find_first_of("( "));
+        };
+        std::transform(mSettings.library.defines().begin(),
+                       mSettings.library.defines().end(),
+                       std::inserter(configDefines, configDefines.end()),
+                       getDefineName);
+
+        preprocessor.setLoadCallback([&](simplecpp::FileData &data) {
+            // Do preprocessing on included file
+            mLogger->addRemarkComments(preprocessor.getRemarkComments(data.tokens));
+            preprocessor.inlineSuppressions(data.tokens, mSuppressions.nomsg);
+            Preprocessor::removeComments(data.tokens);
+            Preprocessor::createDirectives(data.tokens, directives);
+            Preprocessor::simplifyPragmaAsm(data.tokens);
+            // Discover new configurations from included file
+            if (configurations.size() < maxConfigs)
+                preprocessor.getConfigs(data.filename, data.tokens, configDefines, configurations);
+        });
+
         preprocessor.setPlatformInfo();
 
         // Get configurations..
-        std::set<std::string> configurations;
         if (maxConfigs > 1) {
             Timer::run("Preprocessor::getConfigs", mTimerResults, [&]() {
-                configurations = preprocessor.getConfigs();
+                configurations = { "" };
+                preprocessor.getConfigs(configDefines, configurations);
+                preprocessor.loadFiles(files);
             });
         } else {
-            configurations.insert(mSettings.userDefines);
+            configurations = { mSettings.userDefines };
         }
 
         if (mSettings.checkConfiguration) {
@@ -1089,7 +1117,6 @@ unsigned int CppCheck::checkInternal(const FileWithDetails& file, const std::str
         createDumpFile(mSettings, file, fdump, dumpFile);
         if (fdump.is_open()) {
             fdump << getLibraryDumpData();
-            fdump << dumpProlog;
             if (!mSettings.dump)
                 filesDeleter.addFile(dumpFile);
         }
@@ -1259,12 +1286,20 @@ unsigned int CppCheck::checkInternal(const FileWithDetails& file, const std::str
         }
 
         // TODO: will not be closed if we encountered an exception
-        // dumped all configs, close root </dumps> element now
         if (fdump.is_open()) {
+            // dump all filenames, raw tokens, suppressions
+            std::string dumpHeader = getDumpFileContentsRawTokensHeader(files);
+            fdump << getDumpFileContentsRawTokens(dumpHeader, dumpFooter);
+            mSuppressions.nomsg.dump(fdump);
+            // dumped all configs, close root </dumps> element now
             fdump << "</dumps>" << std::endl;
             fdump.close();
         }
 
+        if (!mSettings.plistOutput.empty()) {
+            mLogger->setPlistFilenames(std::move(files));
+        }
+
         executeAddons(dumpFile, file);
     } catch (const TerminateException &) {
         // Analysis is terminated
@@ -1892,9 +1927,26 @@ bool CppCheck::isPremiumCodingStandardId(const std::string& id) const {
     return false;
 }
 
-std::string CppCheck::getDumpFileContentsRawTokens(const std::vector<std::string>& files, const simplecpp::TokenList& tokens1) const {
+std::string CppCheck::getDumpFileContentsRawTokens(const std::vector<std::string>& files, const simplecpp::TokenList& tokens1) const
+{
+    std::string header = getDumpFileContentsRawTokensHeader(files);
+    std::string footer = getDumpFileContentsRawTokensFooter(tokens1);
+    return getDumpFileContentsRawTokens(header, footer);
+}
+
+std::string CppCheck::getDumpFileContentsRawTokens(const std::string& header, const std::string& footer)
+{
     std::string dumpProlog;
     dumpProlog += "  <rawtokens>\n";
+    dumpProlog += header;
+    dumpProlog += footer;
+    dumpProlog += "  </rawtokens>\n";
+    return dumpProlog;
+}
+
+std::string CppCheck::getDumpFileContentsRawTokensHeader(const std::vector<std::string>& files) const
+{
+    std::string dumpProlog;
     for (unsigned int i = 0; i < files.size(); ++i) {
         dumpProlog += "    <file index=\"";
         dumpProlog += std::to_string(i);
@@ -1902,6 +1954,12 @@ std::string CppCheck::getDumpFileContentsRawTokens(const std::vector<std::string
         dumpProlog += ErrorLogger::toxml(Path::getRelativePath(files[i], mSettings.basePaths));
         dumpProlog += "\"/>\n";
     }
+    return dumpProlog;
+}
+
+std::string CppCheck::getDumpFileContentsRawTokensFooter(const simplecpp::TokenList& tokens1)
+{
+    std::string dumpProlog;
     for (const simplecpp::Token *tok = tokens1.cfront(); tok; tok = tok->next) {
         dumpProlog += "    <tok ";
 
@@ -1913,7 +1971,7 @@ std::string CppCheck::getDumpFileContentsRawTokens(const std::vector<std::string
         dumpProlog += std::to_string(tok->location.line);
         dumpProlog += "\" ";
 
-        dumpProlog +="column=\"";
+        dumpProlog += "column=\"";
         dumpProlog += std::to_string(tok->location.col);
         dumpProlog += "\" ";
 
@@ -1923,6 +1981,5 @@ std::string CppCheck::getDumpFileContentsRawTokens(const std::vector<std::string
 
         dumpProlog += "/>\n";
     }
-    dumpProlog += "  </rawtokens>\n";
     return dumpProlog;
 }
diff --git a/lib/cppcheck.h b/lib/cppcheck.h
index 014b15e393a..4ccd68193ea 100644
--- a/lib/cppcheck.h
+++ b/lib/cppcheck.h
@@ -153,6 +153,9 @@ class CPPCHECKLIB CppCheck {
      * @brief Get dumpfile <rawtokens> contents, this is only public for testing purposes
      */
     std::string getDumpFileContentsRawTokens(const std::vector<std::string>& files, const simplecpp::TokenList& tokens1) const;
+    static std::string getDumpFileContentsRawTokens(const std::string& header, const std::string& footer);
+    std::string getDumpFileContentsRawTokensHeader(const std::vector<std::string>& files) const;
+    static std::string getDumpFileContentsRawTokensFooter(const simplecpp::TokenList& tokens1);
 
     std::string getLibraryDumpData() const;
 
@@ -183,7 +186,7 @@ class CPPCHECKLIB CppCheck {
      */
     unsigned int checkFile(const FileWithDetails& file, const std::string &cfgname);
 
-    void checkPlistOutput(const FileWithDetails& file, const std::vector<std::string>& files);
+    void checkPlistOutput(const FileWithDetails& file);
 
     /**
      * @brief Check a file using buffer
diff --git a/lib/errorlogger.cpp b/lib/errorlogger.cpp
index 3b05a7d5a8f..d58c5abcbba 100644
--- a/lib/errorlogger.cpp
+++ b/lib/errorlogger.cpp
@@ -821,7 +821,7 @@ std::string ErrorLogger::toxml(const std::string &str)
     return xml;
 }
 
-std::string ErrorLogger::plistHeader(const std::string &version, const std::vector<std::string> &files)
+std::string ErrorLogger::plistHeader(const std::string &version)
 {
     std::ostringstream ostr;
     ostr << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n"
@@ -829,12 +829,7 @@ std::string ErrorLogger::plistHeader(const std::string &version, const std::vect
          << "<plist version=\"1.0\">\r\n"
          << "<dict>\r\n"
          << " <key>clang_version</key>\r\n"
-         << "<string>cppcheck version " << version << "</string>\r\n"
-         << " <key>files</key>\r\n"
-         << " <array>\r\n";
-    for (const std::string & file : files)
-        ostr << "  <string>" << ErrorLogger::toxml(file) << "</string>\r\n";
-    ostr << " </array>\r\n"
+         << " <string>cppcheck version " << version << "</string>\r\n"
          << " <key>diagnostics</key>\r\n"
          << " <array>\r\n";
     return ostr.str();
diff --git a/lib/errorlogger.h b/lib/errorlogger.h
index daf683bd0a3..97cc3e7f82e 100644
--- a/lib/errorlogger.h
+++ b/lib/errorlogger.h
@@ -28,6 +28,7 @@
 #include <ctime>
 #include <list>
 #include <set>
+#include <sstream>
 #include <string>
 #include <utility>
 #include <vector>
@@ -271,12 +272,19 @@ class CPPCHECKLIB ErrorLogger {
      */
     static std::string toxml(const std::string &str);
 
-    static std::string plistHeader(const std::string &version, const std::vector<std::string> &files);
+    static std::string plistHeader(const std::string &version);
     static std::string plistData(const ErrorMessage &msg);
-    static const char *plistFooter() {
-        return " </array>\r\n"
-               "</dict>\r\n"
-               "</plist>";
+    static std::string plistFooter(const std::vector<std::string>& files) {
+        std::ostringstream ostr;
+        ostr << " </array>\r\n"
+             << " <key>files</key>\r\n"
+             << " <array>\r\n";
+        for (const std::string& file : files)
+            ostr << "  <string>" << ErrorLogger::toxml(file) << "</string>\r\n";
+        ostr << " </array>\r\n"
+             << "</dict>\r\n"
+             << "</plist>";
+        return ostr.str();
     }
 
     static bool isCriticalErrorId(const std::string& id) {
diff --git a/lib/preprocessor.cpp b/lib/preprocessor.cpp
index 4246da39c83..3e0b33c7f10 100644
--- a/lib/preprocessor.cpp
+++ b/lib/preprocessor.cpp
@@ -336,67 +336,49 @@ static void addInlineSuppressions(const simplecpp::TokenList &tokens, const Sett
     }
 }
 
-void Preprocessor::inlineSuppressions(SuppressionList &suppressions)
+void Preprocessor::inlineSuppressions(SuppressionList &suppressions) const
+{
+    inlineSuppressions(mTokens, suppressions);
+}
+
+void Preprocessor::inlineSuppressions(const simplecpp::TokenList &tokens, SuppressionList &suppressions) const
 {
     if (!mSettings.inlineSuppressions)
         return;
     std::list<BadInlineSuppression> err;
-    ::addInlineSuppressions(mTokens, mSettings, suppressions, err);
-    for (const auto &filedata : mFileCache) {
-        ::addInlineSuppressions(filedata->tokens, mSettings, suppressions, err);
-    }
+    ::addInlineSuppressions(tokens, mSettings, suppressions, err);
     for (const BadInlineSuppression &bad : err) {
         invalidSuppression(bad.location, bad.errmsg);
     }
 }
 
-std::vector<RemarkComment> Preprocessor::getRemarkComments() const
+void Preprocessor::createDirectives(std::list<Directive> &directives) const
 {
-    std::vector<RemarkComment> ret;
-    addRemarkComments(mTokens, ret);
-    for (const auto &filedata : mFileCache) {
-        addRemarkComments(filedata->tokens, ret);
-    }
-    return ret;
+    createDirectives(mTokens, directives);
 }
 
-std::list<Directive> Preprocessor::createDirectives() const
+void Preprocessor::createDirectives(const simplecpp::TokenList &tokens, std::list<Directive> &directives)
 {
-    // directive list..
-    std::list<Directive> directives;
-
-    std::vector<const simplecpp::TokenList *> list;
-    list.reserve(1U + mFileCache.size());
-    list.push_back(&mTokens);
-    std::transform(mFileCache.cbegin(), mFileCache.cend(), std::back_inserter(list),
-                   [](const std::unique_ptr<simplecpp::FileData> &filedata) {
-        return &filedata->tokens;
-    });
-
-    for (const simplecpp::TokenList *tokenList : list) {
-        for (const simplecpp::Token *tok = tokenList->cfront(); tok; tok = tok->next) {
-            if ((tok->op != '#') || (tok->previous && tok->previous->location.line == tok->location.line))
-                continue;
-            if (tok->next && tok->next->str() == "endfile")
+    for (const simplecpp::Token *tok = tokens.cfront(); tok; tok = tok->next) {
+        if ((tok->op != '#') || (tok->previous && tok->previous->location.line == tok->location.line))
+            continue;
+        if (tok->next && tok->next->str() == "endfile")
+            continue;
+        Directive directive(tokens, tok->location, "");
+        for (const simplecpp::Token *tok2 = tok; tok2 && tok2->location.line == directive.linenr; tok2 = tok2->next) {
+            if (tok2->comment)
                 continue;
-            Directive directive(mTokens, tok->location, "");
-            for (const simplecpp::Token *tok2 = tok; tok2 && tok2->location.line == directive.linenr; tok2 = tok2->next) {
-                if (tok2->comment)
-                    continue;
-                if (!directive.str.empty() && (tok2->location.col > tok2->previous->location.col + tok2->previous->str().size()))
-                    directive.str += ' ';
-                if (directive.str == "#" && tok2->str() == "file")
-                    directive.str += "include";
-                else
-                    directive.str += tok2->str();
-
-                directive.strTokens.emplace_back(*tok2);
-            }
-            directives.push_back(std::move(directive));
+            if (!directive.str.empty() && (tok2->location.col > tok2->previous->location.col + tok2->previous->str().size()))
+                directive.str += ' ';
+            if (directive.str == "#" && tok2->str() == "file")
+                directive.str += "include";
+            else
+                directive.str += tok2->str();
+
+            directive.strTokens.emplace_back(*tok2);
         }
+        directives.push_back(std::move(directive));
     }
-
-    return directives;
 }
 
 static std::string readcondition(const simplecpp::Token *iftok, const std::set<std::string> &defined, const std::set<std::string> &undefined)
@@ -769,36 +751,21 @@ static void getConfigs(const simplecpp::TokenList &tokens, std::set<std::string>
         ret.insert(std::move(elseError));
 }
 
-
-std::set<std::string> Preprocessor::getConfigs() const
+void Preprocessor::getConfigs(std::set<std::string> &defined, std::set<std::string> &configs) const
 {
-    std::set<std::string> ret = { "" };
     if (!mTokens.cfront())
-        return ret;
-
-    std::set<std::string> defined = { "__cplusplus" };
-
-    // Insert library defines
-    for (const auto &define : mSettings.library.defines()) {
-
-        const std::string::size_type paren = define.find("(");
-        const std::string::size_type space = define.find(" ");
-        std::string::size_type end = space;
-
-        if (paren != std::string::npos && paren < space)
-            end = paren;
-
-        defined.insert(define.substr(0, end));
-    }
+        return;
 
-    ::getConfigs(mTokens, defined, mSettings.userDefines, mSettings.userUndefs, ret);
+    ::getConfigs(mTokens, defined, mSettings.userDefines, mSettings.userUndefs, configs);
+}
 
-    for (const auto &filedata : mFileCache) {
-        if (!mSettings.configurationExcluded(filedata->filename))
-            ::getConfigs(filedata->tokens, defined, mSettings.userDefines, mSettings.userUndefs, ret);
-    }
+void Preprocessor::getConfigs(const std::string &filename, const simplecpp::TokenList &tokens, std::set<std::string> &defined, std::set<std::string> &configs) const
+{
+    if (!tokens.cfront())
+        return;
 
-    return ret;
+    if (!mSettings.configurationExcluded(filename))
+        ::getConfigs(tokens, defined, mSettings.userDefines, mSettings.userUndefs, configs);
 }
 
 static void splitcfg(const std::string &cfgStr, std::list<std::string> &defines, const std::string &defaultValue)
@@ -871,16 +838,18 @@ bool Preprocessor::loadFiles(std::vector<std::string> &files)
     const simplecpp::DUI dui = createDUI(mSettings, "", mLang);
 
     simplecpp::OutputList outputList;
-    mFileCache = simplecpp::load(mTokens, files, dui, &outputList);
+    mFileCache = simplecpp::load(mTokens, files, dui, &outputList, std::move(mFileCache));
     return !handleErrors(outputList);
 }
 
 void Preprocessor::removeComments()
 {
-    mTokens.removeComments();
-    for (const auto &filedata : mFileCache) {
-        filedata->tokens.removeComments();
-    }
+    removeComments(mTokens);
+}
+
+void Preprocessor::removeComments(simplecpp::TokenList &tokens)
+{
+    tokens.removeComments();
 }
 
 void Preprocessor::setPlatformInfo()
@@ -1016,12 +985,12 @@ static std::string simplecppErrToId(simplecpp::Output::Type type)
     cppcheck::unreachable();
 }
 
-void Preprocessor::error(const simplecpp::Location& loc, const std::string &msg, simplecpp::Output::Type type)
+void Preprocessor::error(const simplecpp::Location& loc, const std::string &msg, simplecpp::Output::Type type) const
 {
     error(loc, msg, simplecppErrToId(type));
 }
 
-void Preprocessor::error(const simplecpp::Location& loc, const std::string &msg, const std::string& id)
+void Preprocessor::error(const simplecpp::Location& loc, const std::string &msg, const std::string& id) const
 {
     std::list<ErrorMessage::FileLocation> locationList;
     if (!mTokens.file(loc).empty()) {
@@ -1059,7 +1028,7 @@ void Preprocessor::missingInclude(const simplecpp::Location& loc, const std::str
     mErrorLogger.reportErr(errmsg);
 }
 
-void Preprocessor::invalidSuppression(const simplecpp::Location& loc, const std::string &msg)
+void Preprocessor::invalidSuppression(const simplecpp::Location& loc, const std::string &msg) const
 {
     error(loc, msg, "invalidSuppression");
 }
@@ -1143,13 +1112,10 @@ std::size_t Preprocessor::calculateHash(const std::string &toolinfo) const
 
 void Preprocessor::simplifyPragmaAsm()
 {
-    Preprocessor::simplifyPragmaAsmPrivate(mTokens);
-    for (const auto &filedata : mFileCache) {
-        Preprocessor::simplifyPragmaAsmPrivate(filedata->tokens);
-    }
+    simplifyPragmaAsm(mTokens);
 }
 
-void Preprocessor::simplifyPragmaAsmPrivate(simplecpp::TokenList &tokenList)
+void Preprocessor::simplifyPragmaAsm(simplecpp::TokenList &tokenList)
 {
     // assembler code..
     for (simplecpp::Token *tok = tokenList.front(); tok; tok = tok->next) {
@@ -1196,9 +1162,15 @@ void Preprocessor::simplifyPragmaAsmPrivate(simplecpp::TokenList &tokenList)
     }
 }
 
+std::vector<RemarkComment> Preprocessor::getRemarkComments() const
+{
+    return getRemarkComments(mTokens);
+}
 
-void Preprocessor::addRemarkComments(const simplecpp::TokenList &tokens, std::vector<RemarkComment> &remarkComments) const
+std::vector<RemarkComment> Preprocessor::getRemarkComments(const simplecpp::TokenList &tokens) const
 {
+    std::vector<RemarkComment> remarkComments;
+
     for (const simplecpp::Token *tok = tokens.cfront(); tok; tok = tok->next) {
         if (!tok->comment)
             continue;
@@ -1245,4 +1217,6 @@ void Preprocessor::addRemarkComments(const simplecpp::TokenList &tokens, std::ve
         // Add the suppressions.
         remarkComments.emplace_back(relativeFilename, remarkedToken->location.line, remarkText);
     }
+
+    return remarkComments;
 }
diff --git a/lib/preprocessor.h b/lib/preprocessor.h
index ba4d55a1e60..3a5a8393a3e 100644
--- a/lib/preprocessor.h
+++ b/lib/preprocessor.h
@@ -98,24 +98,36 @@ class CPPCHECKLIB RemarkComment {
  * configurations that exist in a source file.
  */
 class CPPCHECKLIB WARN_UNUSED Preprocessor {
+    friend class TestPreprocessor;
+
 public:
     /** character that is inserted in expanded macros */
     static char macroChar;
 
     Preprocessor(simplecpp::TokenList& tokens, const Settings& settings, ErrorLogger &errorLogger, Standards::Language lang);
 
-    void inlineSuppressions(SuppressionList &suppressions);
+    void inlineSuppressions(SuppressionList &suppressions) const;
+
+    void inlineSuppressions(const simplecpp::TokenList &tokens, SuppressionList &suppressions) const;
+
+    void createDirectives(std::list<Directive> &directives) const;
 
-    std::list<Directive> createDirectives() const;
+    static void createDirectives(const simplecpp::TokenList &tokens, std::list<Directive> &directives);
 
-    std::set<std::string> getConfigs() const;
+    void getConfigs(std::set<std::string> &defined, std::set<std::string> &configs) const;
+
+    void getConfigs(const std::string &filename, const simplecpp::TokenList &tokens, std::set<std::string> &defined, std::set<std::string> &configs) const;
 
     std::vector<RemarkComment> getRemarkComments() const;
 
+    std::vector<RemarkComment> getRemarkComments(const simplecpp::TokenList &tokens) const;
+
     bool loadFiles(std::vector<std::string> &files);
 
     void removeComments();
 
+    static void removeComments(simplecpp::TokenList &tokens);
+
     void setPlatformInfo();
 
     simplecpp::TokenList preprocess(const std::string &cfgStr, std::vector<std::string> &files, simplecpp::OutputList& outputList);
@@ -132,6 +144,8 @@ class CPPCHECKLIB WARN_UNUSED Preprocessor {
 
     void simplifyPragmaAsm();
 
+    static void simplifyPragmaAsm(simplecpp::TokenList &tokenList);
+
     static void getErrorMessages(ErrorLogger &errorLogger, const Settings &settings);
 
     /**
@@ -141,12 +155,15 @@ class CPPCHECKLIB WARN_UNUSED Preprocessor {
 
     const simplecpp::Output* reportOutput(const simplecpp::OutputList &outputList, bool showerror);
 
-    void error(const simplecpp::Location& loc, const std::string &msg, simplecpp::Output::Type type);
+    void error(const simplecpp::Location& loc, const std::string &msg, simplecpp::Output::Type type) const;
 
     const simplecpp::Output* handleErrors(const simplecpp::OutputList &outputList);
 
+    void setLoadCallback(simplecpp::FileDataCache::load_callback_type cb) {
+        mFileCache.set_load_callback(std::move(cb));
+    }
+
 private:
-    static void simplifyPragmaAsmPrivate(simplecpp::TokenList &tokenList);
 
     /**
      * Include file types.
@@ -157,18 +174,14 @@ class CPPCHECKLIB WARN_UNUSED Preprocessor {
     };
 
     void missingInclude(const simplecpp::Location& loc, const std::string &header, HeaderTypes headerType);
-    void invalidSuppression(const simplecpp::Location& loc, const std::string &msg);
-    void error(const simplecpp::Location& loc, const std::string &msg, const std::string& id);
-
-    void addRemarkComments(const simplecpp::TokenList &tokens, std::vector<RemarkComment> &remarkComments) const;
+    void invalidSuppression(const simplecpp::Location& loc, const std::string &msg) const;
+    void error(const simplecpp::Location& loc, const std::string &msg, const std::string& id) const;
 
     simplecpp::TokenList& mTokens;
 
     const Settings& mSettings;
     ErrorLogger &mErrorLogger;
 
-    /** list of all directives met while preprocessing file */
-
     simplecpp::FileDataCache mFileCache;
 
     /** filename for cpp/c file - useful when reporting errors */
diff --git a/test/cli/performance_test.py b/test/cli/performance_test.py
index 55da3b3b04e..5be958619fc 100644
--- a/test/cli/performance_test.py
+++ b/test/cli/performance_test.py
@@ -3,6 +3,7 @@
 
 import os
 import sys
+import time
 
 import pytest
 
@@ -413,3 +414,27 @@ class C {
                 	}
                 }""")
     cppcheck([filename]) # should not take more than ~1 second
+
+
+@pytest.mark.timeout(60)
+def test_slow_many_headers(tmpdir):
+    # 14113
+    c_file = os.path.join(tmpdir, 'source.c')
+    h_file = os.path.join(tmpdir, 'header.h')
+    n_hdr = 128
+    with open(c_file, 'wt') as f:
+        f.write('#include "header.h"\n')
+    with open(h_file, 'wt') as f:
+        for i in range(n_hdr):
+            f.write(f'#ifdef CONFIG{i}\n#include "header{i}.h"\n#endif\n')
+    for i in range(n_hdr):
+        h_file_i = os.path.join(tmpdir, f"header{i}.h")
+        with open(h_file_i, 'wt') as f:
+            for j in range(2048):
+                f.write(f'#define MACRO{j}{(" "+str(j))*128}\n')
+            f.write(f'MACRO{i}\n')
+    # creating the files used for testing can be slow, so we use perf counter here instead
+    start = time.perf_counter_ns()
+    cppcheck(['-DCONFIG0', c_file])
+    end = time.perf_counter_ns()
+    assert end - start < 2 * 10**9 # max 2 sec
diff --git a/test/helpers.cpp b/test/helpers.cpp
index 252658cc531..70437207a84 100644
--- a/test/helpers.cpp
+++ b/test/helpers.cpp
@@ -124,7 +124,8 @@ void SimpleTokenizer2::preprocess(const char* code, std::size_t size, std::vecto
     // Tokenizer..
     tokenizer.list.createTokens(std::move(tokens2));
 
-    std::list<Directive> directives = preprocessor.createDirectives();
+    std::list<Directive> directives;
+    preprocessor.createDirectives(directives);
     tokenizer.setDirectives(std::move(directives));
 }
 
diff --git a/test/testcppcheck.cpp b/test/testcppcheck.cpp
index 84db6db6c28..17c5b8eff3c 100644
--- a/test/testcppcheck.cpp
+++ b/test/testcppcheck.cpp
@@ -527,7 +527,6 @@ class TestCppcheck : public TestFixture {
     void checkPlistOutput() const {
         Suppressions supprs;
         ErrorLogger2 errorLogger;
-        std::vector<std::string> files = {"textfile.txt"};
 
         {
             const auto s = dinit(Settings, $.templateFormat = templateFormat, $.plistOutput = "output");
@@ -535,7 +534,7 @@ class TestCppcheck : public TestFixture {
             CppCheck cppcheck(s, supprs, errorLogger, nullptr, false, {});
             const FileWithDetails fileWithDetails {file.path(), Path::identify(file.path(), false), 0};
 
-            cppcheck.checkPlistOutput(fileWithDetails, files);
+            cppcheck.checkPlistOutput(fileWithDetails);
             const std::string outputFile {"outputfile_" + std::to_string(std::hash<std::string> {}(fileWithDetails.spath())) + ".plist"};
             ASSERT(Path::exists(outputFile));
             std::remove(outputFile.c_str());
@@ -547,7 +546,7 @@ class TestCppcheck : public TestFixture {
             CppCheck cppcheck(s, supprs, errorLogger, nullptr, false, {});
             const FileWithDetails fileWithDetails {file.path(), Path::identify(file.path(), false), 0};
 
-            cppcheck.checkPlistOutput(fileWithDetails, files);
+            cppcheck.checkPlistOutput(fileWithDetails);
             const std::string outputFile {"outputfile_" + std::to_string(std::hash<std::string> {}(fileWithDetails.spath())) + ".plist"};
             ASSERT(Path::exists(outputFile));
             std::remove(outputFile.c_str());
@@ -557,7 +556,7 @@ class TestCppcheck : public TestFixture {
             Settings s;
             const ScopedFile file("file.c", "");
             CppCheck cppcheck(s, supprs, errorLogger, nullptr, false, {});
-            cppcheck.checkPlistOutput(FileWithDetails(file.path(), Path::identify(file.path(), false), 0), files);
+            cppcheck.checkPlistOutput(FileWithDetails(file.path(), Path::identify(file.path(), false), 0));
         }
     }
 
diff --git a/test/testpreprocessor.cpp b/test/testpreprocessor.cpp
index b90a879738d..5da298a2714 100644
--- a/test/testpreprocessor.cpp
+++ b/test/testpreprocessor.cpp
@@ -32,7 +32,9 @@
 #include "fixture.h"
 #include "helpers.h"
 
+#include <algorithm>
 #include <cstring>
+#include <iterator>
 #include <list>
 #include <map>
 #include <set>
@@ -137,8 +139,11 @@ class TestPreprocessor : public TestFixture {
         preprocessor.simplifyPragmaAsm();
 
         std::map<std::string, std::string> cfgcode;
-        if (cfgs.empty())
-            cfgs = preprocessor.getConfigs();
+        if (cfgs.empty()) {
+            cfgs.insert("");
+            std::set<std::string> configDefines = { "__cplusplus" };
+            preprocessor.getConfigs(configDefines, cfgs);
+        }
         for (const std::string & config : cfgs) {
             try {
                 const bool writeLocations = (strstr(code, "#include") != nullptr);
@@ -368,6 +373,8 @@ class TestPreprocessor : public TestFixture {
         TEST_CASE(testMissingIncludeMixed);
         TEST_CASE(testMissingIncludeCheckConfig);
 
+        TEST_CASE(testLazyInclude);
+
         TEST_CASE(hasInclude);
 
         TEST_CASE(limitsDefines);
@@ -394,10 +401,23 @@ class TestPreprocessor : public TestFixture {
         simplecpp::OutputList outputList;
         simplecpp::TokenList tokens(code,files,"test.c",&outputList);
         Preprocessor preprocessor(tokens, settings, *this, Standards::Language::C);
+        std::set<std::string> configs = { "" };
+        std::set<std::string> configDefines = { "__cplusplus" };
+        const auto getDefineName = [](const std::string &defineString) {
+            return defineString.substr(0, defineString.find_first_of("( "));
+        };
+        std::transform(settings.library.defines().begin(),
+                       settings.library.defines().end(),
+                       std::inserter(configDefines, configDefines.end()),
+                       getDefineName);
+        preprocessor.setLoadCallback([&](simplecpp::FileData &data) {
+            Preprocessor::removeComments(data.tokens);
+            preprocessor.getConfigs(data.filename, data.tokens, configDefines, configs);
+        });
+        preprocessor.removeComments();
+        preprocessor.getConfigs(configDefines, configs);
         ASSERT(preprocessor.loadFiles(files));
         ASSERT(!preprocessor.reportOutput(outputList, true));
-        preprocessor.removeComments();
-        const std::set<std::string> configs = preprocessor.getConfigs();
         std::string ret;
         for (const std::string & config : configs)
             ret += config + '\n';
@@ -409,8 +429,11 @@ class TestPreprocessor : public TestFixture {
         std::vector<std::string> files;
         simplecpp::TokenList tokens(code,files,"test.c");
         Preprocessor preprocessor(tokens, settingsDefault, *this, Standards::Language::C);
-        ASSERT(preprocessor.loadFiles(files));
+        preprocessor.setLoadCallback([](simplecpp::FileData &data) {
+            Preprocessor::removeComments(data.tokens);
+        });
         preprocessor.removeComments();
+        ASSERT(preprocessor.loadFiles(files));
         return preprocessor.calculateHash("");
     }
 
@@ -3033,6 +3056,36 @@ class TestPreprocessor : public TestFixture {
                       "test.c:11:2: information: Include file: <" + missing4 + "> not found. Please note: Standard library headers do not need to be provided to get proper results. [missingIncludeSystem]\n", errout_str());
     }
 
+    void testLazyInclude() {
+        const char *code = "#ifdef CONFIG1\n"
+                           "#include \"header1.h\"\n"
+                           "#include \"missing1.h\"\n"
+                           "#else\n"
+                           "#include \"header2.h\"\n"
+                           "#include \"missing2.h\"\n"
+                           "#endif\n";
+
+        std::vector<std::string> files;
+        simplecpp::TokenList tokens(code, files, "test.c");
+
+        ScopedFile header1("header1.h", "1");
+        ScopedFile header2("header2.h", "2");
+
+        Settings settings;
+        Preprocessor preprocessor(tokens, settings, *this, Standards::Language::CPP);
+
+        simplecpp::OutputList outputList;
+        simplecpp::TokenList tokens2 = preprocessor.preprocess("CONFIG1", files, outputList);
+        std::string out = tokens2.stringify();
+
+        const simplecpp::FileDataCache &cache = preprocessor.mFileCache;
+
+        ASSERT_EQUALS("\n#line 1 \"header1.h\"\n1", out);
+        ASSERT_EQUALS(1, outputList.size());
+        ASSERT_EQUALS("Header not found: \"missing1.h\"", outputList.begin()->msg);
+        ASSERT_EQUALS(1, cache.size());
+    }
+
     void hasInclude() {
         const char code[] = "#if __has_include(<directory/non-existent-header.h>)\n123\n#endif";
         Settings settings;
diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 167d5411553..0617007744a 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -603,9 +603,13 @@ class TestTokenizer : public TestFixture {
         std::vector<std::string> files;
         simplecpp::TokenList tokens1(code, files, filename, &outputList);
         Preprocessor preprocessor(tokens1, settings, *this, Path::identify(tokens1.getFiles()[0], false));
-        (void)preprocessor.reportOutput(outputList, true);
+        std::list<Directive> directives;
+        preprocessor.setLoadCallback([&](const simplecpp::FileData &data) {
+            Preprocessor::createDirectives(data.tokens, directives);
+        });
+        preprocessor.createDirectives(directives);
         ASSERT(preprocessor.loadFiles(files));
-        std::list<Directive> directives = preprocessor.createDirectives();
+        (void)preprocessor.reportOutput(outputList, true);
 
         TokenList tokenlist{settings, Path::identify(filename, false)};
         Tokenizer tokenizer(std::move(tokenlist), *this);