Modernize the "textcodec" feature

Also clean up QTextCodec usage in qmake build and some includes
of qtextcodec.h.

Change-Id: I0475b82690024054add4e85a8724c8ea3adcf62a
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

31 files changed, 138 insertions, 142 deletions

diff --git a/src/corelib/codecs/codecs.pri b/src/corelib/codecs/codecs.pri
index d86d446c72..f1bbde1d69 100644
--- a/src/corelib/codecs/codecs.pri
+++ b/src/corelib/codecs/codecs.pri
@@ -1,62 +1,68 @@
 # Qt core library codecs module
 
 HEADERS += \
-    codecs/qlatincodec_p.h \
-    codecs/qsimplecodec_p.h \
     codecs/qtextcodec_p.h \
-    codecs/qtextcodec.h \
     codecs/qutfcodec_p.h
 
 SOURCES += \
-    codecs/qlatincodec.cpp \
-    codecs/qsimplecodec.cpp \
-    codecs/qtextcodec.cpp \
     codecs/qutfcodec.cpp
 
-qtConfig(codecs) {
+qtConfig(textcodec) {
     HEADERS += \
-        codecs/qisciicodec_p.h \
-        codecs/qtsciicodec_p.h
+        codecs/qlatincodec_p.h \
+        codecs/qsimplecodec_p.h \
+        codecs/qtextcodec.h
 
     SOURCES += \
-        codecs/qisciicodec.cpp \
-        codecs/qtsciicodec.cpp
-}
+        codecs/qlatincodec.cpp \
+        codecs/qsimplecodec.cpp \
+        codecs/qtextcodec.cpp
 
-qtConfig(icu) {
-    HEADERS += \
-        codecs/qicucodec_p.h
-    SOURCES += \
-        codecs/qicucodec.cpp
-} else {
-    qtConfig(big_codecs) {
+    qtConfig(codecs) {
         HEADERS += \
-            codecs/qgb18030codec_p.h \
-            codecs/qeucjpcodec_p.h \
-            codecs/qjiscodec_p.h \
-            codecs/qsjiscodec_p.h \
-            codecs/qeuckrcodec_p.h \
-            codecs/qbig5codec_p.h
+            codecs/qisciicodec_p.h \
+            codecs/qtsciicodec_p.h
 
         SOURCES += \
-            codecs/qgb18030codec.cpp \
-            codecs/qjpunicode.cpp \
-            codecs/qeucjpcodec.cpp \
-            codecs/qjiscodec.cpp \
-            codecs/qsjiscodec.cpp \
-            codecs/qeuckrcodec.cpp \
-            codecs/qbig5codec.cpp
+            codecs/qisciicodec.cpp \
+            codecs/qtsciicodec.cpp
     }
 
-    qtConfig(iconv) {
-        HEADERS += codecs/qiconvcodec_p.h
-        SOURCES += codecs/qiconvcodec.cpp
-        qtConfig(gnu-libiconv): \
-            QMAKE_USE_PRIVATE += iconv
-    }
+    qtConfig(icu) {
+        HEADERS += \
+            codecs/qicucodec_p.h
+        SOURCES += \
+            codecs/qicucodec.cpp
+    } else {
+        qtConfig(big_codecs) {
+            HEADERS += \
+                codecs/qgb18030codec_p.h \
+                codecs/qeucjpcodec_p.h \
+                codecs/qjiscodec_p.h \
+                codecs/qsjiscodec_p.h \
+                codecs/qeuckrcodec_p.h \
+                codecs/qbig5codec_p.h
+
+            SOURCES += \
+                codecs/qgb18030codec.cpp \
+                codecs/qjpunicode.cpp \
+                codecs/qeucjpcodec.cpp \
+                codecs/qjiscodec.cpp \
+                codecs/qsjiscodec.cpp \
+                codecs/qeuckrcodec.cpp \
+                codecs/qbig5codec.cpp
+        }
+
+        qtConfig(iconv) {
+            HEADERS += codecs/qiconvcodec_p.h
+            SOURCES += codecs/qiconvcodec.cpp
+            qtConfig(gnu-libiconv): \
+                QMAKE_USE_PRIVATE += iconv
+        }
 
-    win32 {
-        SOURCES += codecs/qwindowscodec.cpp
-        HEADERS += codecs/qwindowscodec_p.h
+        win32 {
+            SOURCES += codecs/qwindowscodec.cpp
+            HEADERS += codecs/qwindowscodec_p.h
+        }
     }
 }
diff --git a/src/corelib/codecs/qiconvcodec.cpp b/src/corelib/codecs/qiconvcodec.cpp
index 330eb7c038..9c39727946 100644
--- a/src/corelib/codecs/qiconvcodec.cpp
+++ b/src/corelib/codecs/qiconvcodec.cpp
@@ -39,8 +39,6 @@
 
 #include <QtCore/private/qglobal_p.h>
 
-QT_REQUIRE_CONFIG(iconv);
-
 #include "qiconvcodec_p.h"
 #include "qtextcodec_p.h"
 #include <qdebug.h>
diff --git a/src/corelib/codecs/qicucodec.cpp b/src/corelib/codecs/qicucodec.cpp
index 06a6d95e82..101c3a3278 100644
--- a/src/corelib/codecs/qicucodec.cpp
+++ b/src/corelib/codecs/qicucodec.cpp
@@ -39,8 +39,6 @@
 
 #include "qicucodec_p.h"
 
-#ifndef QT_NO_TEXTCODEC
-
 #include "qtextcodec_p.h"
 #include "qutfcodec_p.h"
 #include "qlatincodec_p.h"
@@ -698,5 +696,3 @@ int QIcuCodec::mibEnum() const
 }
 
 QT_END_NAMESPACE
-
-#endif // QT_NO_TEXTCODEC
diff --git a/src/corelib/codecs/qicucodec_p.h b/src/corelib/codecs/qicucodec_p.h
index 0c2dbe17d6..1cbe4d4e7a 100644
--- a/src/corelib/codecs/qicucodec_p.h
+++ b/src/corelib/codecs/qicucodec_p.h
@@ -59,9 +59,9 @@ extern "C" {
     typedef struct UConverter UConverter;
 }
 
-QT_BEGIN_NAMESPACE
+QT_REQUIRE_CONFIG(textcodec);
 
-#ifndef QT_NO_TEXTCODEC
+QT_BEGIN_NAMESPACE
 
 class QIcuCodec : public QTextCodec
 {
@@ -90,8 +90,6 @@ private:
     const char *m_name;
 };
 
-#endif // QT_NO_TEXTCODEC
-
 QT_END_NAMESPACE
 
 #endif
diff --git a/src/corelib/codecs/qlatincodec.cpp b/src/corelib/codecs/qlatincodec.cpp
index cfbd481f1e..1b53d26ef4 100644
--- a/src/corelib/codecs/qlatincodec.cpp
+++ b/src/corelib/codecs/qlatincodec.cpp
@@ -40,8 +40,6 @@
 #include "qlatincodec_p.h"
 #include "qlist.h"
 
-#ifndef QT_NO_TEXTCODEC
-
 QT_BEGIN_NAMESPACE
 
 QLatin1Codec::~QLatin1Codec()
@@ -238,5 +236,3 @@ int QLatin15Codec::mibEnum() const
 }
 
 QT_END_NAMESPACE
-
-#endif // QT_NO_TEXTCODEC
diff --git a/src/corelib/codecs/qlatincodec_p.h b/src/corelib/codecs/qlatincodec_p.h
index 3e258e5ae1..26f9e596a9 100644
--- a/src/corelib/codecs/qlatincodec_p.h
+++ b/src/corelib/codecs/qlatincodec_p.h
@@ -54,9 +54,9 @@
 #include <QtCore/private/qglobal_p.h>
 #include "QtCore/qtextcodec.h"
 
-QT_BEGIN_NAMESPACE
+QT_REQUIRE_CONFIG(textcodec);
 
-#ifndef QT_NO_TEXTCODEC
+QT_BEGIN_NAMESPACE
 
 class QLatin1Codec : public QTextCodec
 {
@@ -86,8 +86,6 @@ public:
     int mibEnum() const override;
 };
 
-#endif // QT_NO_TEXTCODEC
-
 QT_END_NAMESPACE
 
 #endif // QLATINCODEC_P_H
diff --git a/src/corelib/codecs/qsimplecodec.cpp b/src/corelib/codecs/qsimplecodec.cpp
index beb0a08f62..9ab545d783 100644
--- a/src/corelib/codecs/qsimplecodec.cpp
+++ b/src/corelib/codecs/qsimplecodec.cpp
@@ -40,8 +40,6 @@
 #include "qsimplecodec_p.h"
 #include "qlist.h"
 
-#ifndef QT_NO_TEXTCODEC
-
 QT_BEGIN_NAMESPACE
 
 #define LAST_MIB 2004
@@ -724,5 +722,3 @@ int QSimpleTextCodec::mibEnum() const
 }
 
 QT_END_NAMESPACE
-
-#endif // QT_NO_TEXTCODEC
diff --git a/src/corelib/codecs/qsimplecodec_p.h b/src/corelib/codecs/qsimplecodec_p.h
index 188c3f3cb4..a4b2a45e6b 100644
--- a/src/corelib/codecs/qsimplecodec_p.h
+++ b/src/corelib/codecs/qsimplecodec_p.h
@@ -54,9 +54,9 @@
 #include <QtCore/private/qglobal_p.h>
 #include "QtCore/qtextcodec.h"
 
-QT_BEGIN_NAMESPACE
+QT_REQUIRE_CONFIG(textcodec);
 
-#ifndef QT_NO_TEXTCODEC
+QT_BEGIN_NAMESPACE
 
 template <typename T> class QAtomicPointer;
 
@@ -79,8 +79,6 @@ private:
     mutable QAtomicPointer<QByteArray> reverseMap;
 };
 
-#endif // QT_NO_TEXTCODEC
-
 QT_END_NAMESPACE
 
 #endif // QSIMPLECODEC_P_H
diff --git a/src/corelib/codecs/qtextcodec.cpp b/src/corelib/codecs/qtextcodec.cpp
index 790921610a..1ec443cd73 100644
--- a/src/corelib/codecs/qtextcodec.cpp
+++ b/src/corelib/codecs/qtextcodec.cpp
@@ -38,11 +38,10 @@
 ****************************************************************************/
 
 #include "qplatformdefs.h"
+
 #include "qtextcodec.h"
 #include "qtextcodec_p.h"
 
-#ifndef QT_NO_TEXTCODEC
-
 #include "qbytearraymatcher.h"
 #include "qlist.h"
 #include "qfile.h"
@@ -1221,5 +1220,3 @@ bool QTextDecoder::hasFailure() const
 }
 
 QT_END_NAMESPACE
-
-#endif // QT_NO_TEXTCODEC
diff --git a/src/corelib/codecs/qtextcodec.h b/src/corelib/codecs/qtextcodec.h
index 8153bebac8..c0261b7aa2 100644
--- a/src/corelib/codecs/qtextcodec.h
+++ b/src/corelib/codecs/qtextcodec.h
@@ -43,10 +43,9 @@
 #include <QtCore/qstring.h>
 #include <QtCore/qlist.h>
 
-QT_BEGIN_NAMESPACE
-
+QT_REQUIRE_CONFIG(textcodec);
 
-#ifndef QT_NO_TEXTCODEC
+QT_BEGIN_NAMESPACE
 
 class QTextCodec;
 class QIODevice;
@@ -167,8 +166,6 @@ private:
     QTextCodec::ConverterState state;
 };
 
-#endif // QT_NO_TEXTCODEC
-
 QT_END_NAMESPACE
 
 #endif // QTEXTCODEC_H
diff --git a/src/corelib/codecs/qtextcodec_p.h b/src/corelib/codecs/qtextcodec_p.h
index f3c2d090c9..6e19d1d30e 100644
--- a/src/corelib/codecs/qtextcodec_p.h
+++ b/src/corelib/codecs/qtextcodec_p.h
@@ -52,12 +52,13 @@
 //
 
 #include <QtCore/private/qglobal_p.h>
-#include "qtextcodec.h"
 #include <string.h>
 
 QT_BEGIN_NAMESPACE
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
+
+#include "qtextcodec.h"
 
 #if defined(Q_OS_MAC) || defined(Q_OS_ANDROID) || defined(Q_OS_QNX)
 #define QT_LOCALE_IS_UTF8
@@ -82,7 +83,7 @@ struct QTextCodecUnalignedPointer
 
 bool qTextCodecNameMatch(const char *a, const char *b);
 
-#else
+#else // without textcodec:
 
 class QTextCodec
 {
@@ -109,7 +110,7 @@ public:
     };
 };
 
-#endif //QT_NO_TEXTCODEC
+#endif // textcodec
 
 QT_END_NAMESPACE
 
diff --git a/src/corelib/codecs/qutfcodec.cpp b/src/corelib/codecs/qutfcodec.cpp
index ce1b092a54..0dffdd723e 100644
--- a/src/corelib/codecs/qutfcodec.cpp
+++ b/src/corelib/codecs/qutfcodec.cpp
@@ -922,7 +922,7 @@ QString QUtf32::convertToUnicode(const char *chars, int len, QTextCodec::Convert
 }
 
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 
 QUtf8Codec::~QUtf8Codec()
 {
@@ -1076,6 +1076,6 @@ QList<QByteArray> QUtf32LECodec::aliases() const
     return list;
 }
 
-#endif //QT_NO_TEXTCODEC
+#endif // textcodec
 
 QT_END_NAMESPACE
diff --git a/src/corelib/codecs/qutfcodec_p.h b/src/corelib/codecs/qutfcodec_p.h
index 659a229dae..d7743753af 100644
--- a/src/corelib/codecs/qutfcodec_p.h
+++ b/src/corelib/codecs/qutfcodec_p.h
@@ -52,7 +52,13 @@
 // We mean it.
 //
 
+#include <QtCore/qstring.h>
+#include <QtCore/qlist.h>
+
+#if QT_CONFIG(textcodec)
 #include "QtCore/qtextcodec.h"
+#endif
+
 #include "private/qtextcodec_p.h"
 
 QT_BEGIN_NAMESPACE
@@ -311,7 +317,7 @@ struct QUtf32
     static QByteArray convertFromUnicode(const QChar *, int, QTextCodec::ConverterState *, DataEndianness = DetectEndianness);
 };
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 
 class QUtf8Codec : public QTextCodec {
 public:
@@ -391,7 +397,7 @@ public:
 };
 
 
-#endif // QT_NO_TEXTCODEC
+#endif // textcodec
 
 QT_END_NAMESPACE
 
diff --git a/src/corelib/codecs/qwindowscodec_p.h b/src/corelib/codecs/qwindowscodec_p.h
index 2fd3c35378..1ca6d5567e 100644
--- a/src/corelib/codecs/qwindowscodec_p.h
+++ b/src/corelib/codecs/qwindowscodec_p.h
@@ -53,6 +53,8 @@
 #include <QtCore/private/qglobal_p.h>
 #include "qtextcodec.h"
 
+QT_REQUIRE_CONFIG(textcodec);
+
 QT_BEGIN_NAMESPACE
 
 class QWindowsLocalCodec: public QTextCodec
diff --git a/src/corelib/global/qconfig-bootstrapped.h b/src/corelib/global/qconfig-bootstrapped.h
index da66e3bcd3..229b4d17a1 100644
--- a/src/corelib/global/qconfig-bootstrapped.h
+++ b/src/corelib/global/qconfig-bootstrapped.h
@@ -127,7 +127,6 @@
 #define QT_NO_COMPRESS
 #define QT_JSON_READONLY
 #define QT_NO_STANDARDPATHS
-#define QT_NO_TEXTCODEC
 #define QT_FEATURE_textcodec -1
 #else
 #define QT_FEATURE_codecs -1
diff --git a/src/corelib/global/qt_pch.h b/src/corelib/global/qt_pch.h
index b3b526342d..76e46374c3 100644
--- a/src/corelib/global/qt_pch.h
+++ b/src/corelib/global/qt_pch.h
@@ -66,5 +66,7 @@
 #include <qregexp.h>
 #include <qstring.h>
 #include <qstringlist.h>
+#if QT_CONFIG(textcodec)
 #include <qtextcodec.h>
 #endif
+#endif
diff --git a/src/corelib/io/qsettings.cpp b/src/corelib/io/qsettings.cpp
index 4b1b9888d8..580fe6caf3 100644
--- a/src/corelib/io/qsettings.cpp
+++ b/src/corelib/io/qsettings.cpp
@@ -54,7 +54,7 @@
 #include "qstandardpaths.h"
 #include <qdatastream.h>
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 #  include "qtextcodec.h"
 #endif
 
@@ -677,7 +677,7 @@ void QSettingsPrivate::iniEscapedString(const QString &str, QByteArray &result,
             if (ch <= 0x1F || (ch >= 0x7F && !useCodec)) {
                 result += "\\x" + QByteArray::number(ch, 16);
                 escapeNextIfDigit = true;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
             } else if (useCodec) {
                 // slow
                 result += codec->fromUnicode(&unicode[i], 1);
@@ -830,7 +830,7 @@ StNormal:
                 ++j;
             }
 
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
             Q_UNUSED(codec)
 #else
             if (codec) {
@@ -1668,7 +1668,7 @@ bool QConfFileSettingsPrivate::readIniFile(const QByteArray &data,
     int sectionPosition = 0;
     bool ok = true;
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     // detect utf8 BOM
     const uchar *dd = (const uchar *)data.constData();
     if (data.size() >= 3 && dd[0] == 0xef && dd[1] == 0xbb && dd[2] == 0xbf) {
@@ -2824,7 +2824,7 @@ QString QSettings::applicationName() const
     return d->applicationName;
 }
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 
 /*!
     \since 4.5
@@ -2877,7 +2877,7 @@ QTextCodec *QSettings::iniCodec() const
     return d->iniCodec;
 }
 
-#endif // QT_NO_TEXTCODEC
+#endif // textcodec
 
 /*!
     Returns a status code indicating the first error that was met by
diff --git a/src/corelib/io/qsettings.h b/src/corelib/io/qsettings.h
index d78edd23a2..ccfec787a6 100644
--- a/src/corelib/io/qsettings.h
+++ b/src/corelib/io/qsettings.h
@@ -178,7 +178,7 @@ public:
     QString organizationName() const;
     QString applicationName() const;
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     void setIniCodec(QTextCodec *codec);
     void setIniCodec(const char *codecName);
     QTextCodec *iniCodec() const;
diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index 4e32f90964..0ea969ece5 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -55,7 +55,6 @@
 #include <qmutex.h>
 #include <private/qloggingregistry_p.h>
 #include <qstandardpaths.h>
-#include <qtextcodec.h>
 #ifndef QT_NO_QOBJECT
 #include <qthread.h>
 #include <qthreadpool.h>
diff --git a/src/corelib/kernel/qcoreglobaldata.cpp b/src/corelib/kernel/qcoreglobaldata.cpp
index e2087b9e64..c3ca2f74e4 100644
--- a/src/corelib/kernel/qcoreglobaldata.cpp
+++ b/src/corelib/kernel/qcoreglobaldata.cpp
@@ -38,7 +38,9 @@
 ****************************************************************************/
 
 #include "qcoreglobaldata_p.h"
+#if QT_CONFIG(textcodec)
 #include "qtextcodec.h"
+#endif
 
 QT_BEGIN_NAMESPACE
 
diff --git a/src/corelib/kernel/qcoreglobaldata_p.h b/src/corelib/kernel/qcoreglobaldata_p.h
index c3c2f7b4a4..fda6b52b6e 100644
--- a/src/corelib/kernel/qcoreglobaldata_p.h
+++ b/src/corelib/kernel/qcoreglobaldata_p.h
@@ -57,7 +57,9 @@
 #include "QtCore/qreadwritelock.h"
 #include "QtCore/qhash.h"
 #include "QtCore/qbytearray.h"
+#if QT_CONFIG(textcodec)
 #include "QtCore/qtextcodec.h"
+#endif
 #include "QtCore/qmutex.h"
 
 QT_BEGIN_NAMESPACE
diff --git a/src/corelib/kernel/qmimedata.cpp b/src/corelib/kernel/qmimedata.cpp
index 73307e925a..c8ad1bc43f 100644
--- a/src/corelib/kernel/qmimedata.cpp
+++ b/src/corelib/kernel/qmimedata.cpp
@@ -42,7 +42,9 @@
 #include "private/qobject_p.h"
 #include "qurl.h"
 #include "qstringlist.h"
+#if QT_CONFIG(textcodec)
 #include "qtextcodec.h"
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -150,7 +152,7 @@ QVariant QMimeDataPrivate::retrieveTypedData(const QString &format, QVariant::Ty
     if (data.type() == QVariant::ByteArray) {
         // see if we can convert to the requested type
         switch(type) {
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
         case QVariant::String: {
             const QByteArray ba = data.toByteArray();
             QTextCodec *codec = QTextCodec::codecForName("utf-8");
@@ -158,7 +160,7 @@ QVariant QMimeDataPrivate::retrieveTypedData(const QString &format, QVariant::Ty
                 codec = QTextCodec::codecForHtml(ba, codec);
             return codec->toUnicode(ba);
         }
-#endif // QT_NO_TEXTCODEC
+#endif // textcodec
         case QVariant::Color: {
             QVariant newData = data;
             newData.convert(QVariant::Color);
diff --git a/src/corelib/serialization/qtextstream.cpp b/src/corelib/serialization/qtextstream.cpp
index ee3cb4efcb..c0a9854d8b 100644
--- a/src/corelib/serialization/qtextstream.cpp
+++ b/src/corelib/serialization/qtextstream.cpp
@@ -326,7 +326,7 @@ QT_BEGIN_NAMESPACE
 */
 QTextStreamPrivate::QTextStreamPrivate(QTextStream *q_ptr)
     :
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     readConverterSavedState(0),
 #endif
     readConverterSavedStateOffset(0),
@@ -347,12 +347,12 @@ QTextStreamPrivate::~QTextStreamPrivate()
 #endif
         delete device;
     }
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     delete readConverterSavedState;
 #endif
 }
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 static void resetCodecConverterStateHelper(QTextCodec::ConverterState *state)
 {
     state->~ConverterState();
@@ -401,7 +401,7 @@ void QTextStreamPrivate::reset()
     readBufferStartDevicePos = 0;
     lastTokenSize = 0;
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     codec = QTextCodec::codecForLocale();
     resetCodecConverterStateHelper(&readConverterState);
     resetCodecConverterStateHelper(&writeConverterState);
@@ -461,7 +461,7 @@ bool QTextStreamPrivate::fillReadBuffer(qint64 maxBytes)
     if (bytesRead <= 0)
         return false;
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     // codec auto detection, explicitly defaults to locale encoding if the
     // codec has been set to 0.
     if (!codec || autoDetectUnicode) {
@@ -485,7 +485,7 @@ bool QTextStreamPrivate::fillReadBuffer(qint64 maxBytes)
 #endif
 
     int oldReadBufferSize = readBuffer.size();
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     // convert to unicode
     readBuffer += Q_LIKELY(codec) ? codec->toUnicode(buf, bytesRead, &readConverterState)
                                   : QString::fromLatin1(buf, bytesRead);
@@ -567,7 +567,7 @@ void QTextStreamPrivate::flushWriteBuffer()
     }
 #endif
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     if (!codec)
         codec = QTextCodec::codecForLocale();
 #if defined (QTEXTSTREAM_DEBUG)
@@ -786,7 +786,7 @@ inline void QTextStreamPrivate::consume(int size)
 */
 inline void QTextStreamPrivate::saveConverterState(qint64 newPos)
 {
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     if (readConverterState.d) {
         // converter cannot be copied, so don't save anything
         // don't update readBufferStartDevicePos either
@@ -807,7 +807,7 @@ inline void QTextStreamPrivate::saveConverterState(qint64 newPos)
 */
 inline void QTextStreamPrivate::restoreToSavedConverterState()
 {
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     if (readConverterSavedState) {
         // we have a saved state
         // that means the converter can be copied
@@ -1202,7 +1202,7 @@ bool QTextStream::seek(qint64 pos)
             return false;
         d->resetReadBuffer();
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
         // Reset the codec converter states.
         resetCodecConverterStateHelper(&d->readConverterState);
         resetCodecConverterStateHelper(&d->writeConverterState);
@@ -1253,7 +1253,7 @@ qint64 QTextStream::pos() const
         QTextStreamPrivate *thatd = const_cast<QTextStreamPrivate *>(d);
         thatd->readBuffer.clear();
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
         thatd->restoreToSavedConverterState();
         if (d->readBufferStartDevicePos == 0)
             thatd->autoDetectUnicode = true;
@@ -3021,7 +3021,7 @@ QTextStream &ws(QTextStream &stream)
     Equivalent to QTextStream::setRealNumberPrecision(\a precision).
 */
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 /*!
     \relates QTextStream
 
diff --git a/src/corelib/serialization/qtextstream.h b/src/corelib/serialization/qtextstream.h
index ee0b09419d..5c766abc3e 100644
--- a/src/corelib/serialization/qtextstream.h
+++ b/src/corelib/serialization/qtextstream.h
@@ -98,7 +98,7 @@ public:
     explicit QTextStream(const QByteArray &array, QIODevice::OpenMode openMode = QIODevice::ReadOnly);
     virtual ~QTextStream();
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     void setCodec(QTextCodec *codec);
     void setCodec(const char *codecName);
     QTextCodec *codec() const;
diff --git a/src/corelib/serialization/qtextstream_p.h b/src/corelib/serialization/qtextstream_p.h
index a642beddc4..172824d27d 100644
--- a/src/corelib/serialization/qtextstream_p.h
+++ b/src/corelib/serialization/qtextstream_p.h
@@ -54,7 +54,7 @@
 
 #include <QtCore/private/qglobal_p.h>
 #include "qtextstream.h"
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 #include "qtextcodec.h"
 #endif
 
@@ -118,7 +118,7 @@ public:
     int stringOffset;
     QIODevice::OpenMode stringOpenMode;
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     // codec
     QTextCodec *codec;
     QTextCodec::ConverterState readConverterState;
@@ -141,7 +141,7 @@ public:
 
     int lastTokenSize;
     bool deleteDevice;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     bool autoDetectUnicode;
 #endif
 
diff --git a/src/corelib/serialization/qxmlstream.cpp b/src/corelib/serialization/qxmlstream.cpp
index f18c4cc8e7..77a195a7e5 100644
--- a/src/corelib/serialization/qxmlstream.cpp
+++ b/src/corelib/serialization/qxmlstream.cpp
@@ -45,7 +45,9 @@
 #include <qdebug.h>
 #include <qfile.h>
 #include <stdio.h>
+#if QT_CONFIG(textcodec)
 #include <qtextcodec.h>
+#endif
 #include <qstack.h>
 #include <qbuffer.h>
 #ifndef QT_BOOTSTRAPPED
@@ -420,7 +422,7 @@ QXmlStreamReader::QXmlStreamReader(const QString &data)
     : d_ptr(new QXmlStreamReaderPrivate(this))
 {
     Q_D(QXmlStreamReader);
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
     d->dataBuffer = data.toLatin1();
 #else
     d->dataBuffer = d->codec->fromUnicode(data);
@@ -515,7 +517,7 @@ void QXmlStreamReader::addData(const QString &data)
 {
     Q_D(QXmlStreamReader);
     d->lockEncoding = true;
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
     addData(data.toLatin1());
 #else
     addData(d->codec->fromUnicode(data));
@@ -792,7 +794,7 @@ QXmlStreamReaderPrivate::QXmlStreamReaderPrivate(QXmlStreamReader *q)
 {
     device = 0;
     deleteDevice = false;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     decoder = 0;
 #endif
     stack_size = 64;
@@ -838,7 +840,7 @@ void QXmlStreamReaderPrivate::init()
     lineNumber = lastLineStart = characterOffset = 0;
     readBufferPos = 0;
     nbytesread = 0;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     codec = QTextCodec::codecForMib(106); // utf8
     delete decoder;
     decoder = 0;
@@ -903,7 +905,7 @@ inline void QXmlStreamReaderPrivate::reallocateStack()
 
 QXmlStreamReaderPrivate::~QXmlStreamReaderPrivate()
 {
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     delete decoder;
 #endif
     free(sym_stack);
@@ -1482,7 +1484,7 @@ uint QXmlStreamReaderPrivate::getChar_helper()
     characterOffset += readBufferPos;
     readBufferPos = 0;
     readBuffer.resize(0);
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     if (decoder)
 #endif
         nbytesread = 0;
@@ -1503,7 +1505,7 @@ uint QXmlStreamReaderPrivate::getChar_helper()
         return StreamEOF;
     }
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     if (!decoder) {
         if (nbytesread < 4) { // the 4 is to cover 0xef 0xbb 0xbf plus
                               // one extra for the utf8 codec
@@ -1545,7 +1547,7 @@ uint QXmlStreamReaderPrivate::getChar_helper()
     }
 #else
     readBuffer = QString::fromLatin1(rawReadBuffer.data(), nbytesread);
-#endif // QT_NO_TEXTCODEC
+#endif // textcodec
 
     readBuffer.reserve(1); // keep capacity when calling resize() next time
 
@@ -1816,7 +1818,7 @@ void QXmlStreamReaderPrivate::startDocument()
             if (!QXmlUtils::isEncName(value))
                 err = QXmlStream::tr("%1 is an invalid encoding name.").arg(value);
             else {
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
                 readBuffer = QString::fromLatin1(rawReadBuffer.data(), nbytesread);
 #else
                 QTextCodec *const newCodec = QTextCodec::codecForName(value.toLatin1());
@@ -1828,7 +1830,7 @@ void QXmlStreamReaderPrivate::startDocument()
                     decoder = codec->makeDecoder();
                     decoder->toUnicode(&readBuffer, rawReadBuffer.data(), nbytesread);
                 }
-#endif // QT_NO_TEXTCODEC
+#endif // textcodec
             }
         } else if (prefix.isEmpty() && key == QLatin1String("standalone")) {
             hasStandalone = true;
@@ -2966,7 +2968,7 @@ public:
     ~QXmlStreamWriterPrivate() {
         if (deleteDevice)
             delete device;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
         delete encoder;
 #endif
     }
@@ -2993,7 +2995,7 @@ public:
     NamespaceDeclaration emptyNamespace;
     int lastNamespaceDeclaration;
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     QTextCodec *codec;
     QTextEncoder *encoder;
 #endif
@@ -3015,7 +3017,7 @@ QXmlStreamWriterPrivate::QXmlStreamWriterPrivate(QXmlStreamWriter *q)
     device = 0;
     stringDevice = 0;
     deleteDevice = false;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     codec = QTextCodec::codecForMib(106); // utf8
     encoder = codec->makeEncoder(QTextCodec::IgnoreHeader); // no byte order mark for utf8
 #endif
@@ -3032,7 +3034,7 @@ QXmlStreamWriterPrivate::QXmlStreamWriterPrivate(QXmlStreamWriter *q)
 
 void QXmlStreamWriterPrivate::checkIfASCIICompatibleCodec()
 {
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     Q_ASSERT(encoder);
     // test ASCII-compatibility using the letter 'a'
     QChar letterA = QLatin1Char('a');
@@ -3052,7 +3054,7 @@ void QXmlStreamWriterPrivate::write(const QStringRef &s)
     if (device) {
         if (hasIoError)
             return;
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
         QByteArray bytes = s.toLatin1();
 #else
         QByteArray bytes = encoder->fromUnicode(s.constData(), s.size());
@@ -3075,7 +3077,7 @@ void QXmlStreamWriterPrivate::write(const QString &s)
     if (device) {
         if (hasIoError)
             return;
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
         QByteArray bytes = s.toLatin1();
 #else
         QByteArray bytes = encoder->fromUnicode(s);
@@ -3324,7 +3326,7 @@ QIODevice *QXmlStreamWriter::device() const
 }
 
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 /*!
     Sets the codec for this stream to \a codec. The codec is used for
     encoding any data that is written. By default, QXmlStreamWriter
@@ -3382,7 +3384,7 @@ QTextCodec *QXmlStreamWriter::codec() const
     Q_D(const QXmlStreamWriter);
     return d->codec;
 }
-#endif // QT_NO_TEXTCODEC
+#endif // textcodec
 
 /*!
     \property  QXmlStreamWriter::autoFormatting
@@ -3847,7 +3849,7 @@ void QXmlStreamWriter::writeStartDocument(const QString &version)
     d->write(version);
     if (d->device) { // stringDevice does not get any encoding
         d->write("\" encoding=\"");
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
         d->write("iso-8859-1");
 #else
         const QByteArray name = d->codec->name();
@@ -3871,7 +3873,7 @@ void QXmlStreamWriter::writeStartDocument(const QString &version, bool standalon
     d->write(version);
     if (d->device) { // stringDevice does not get any encoding
         d->write("\" encoding=\"");
-#ifdef QT_NO_TEXTCODEC
+#if !QT_CONFIG(textcodec)
         d->write("iso-8859-1");
 #else
         const QByteArray name = d->codec->name();
diff --git a/src/corelib/serialization/qxmlstream.g b/src/corelib/serialization/qxmlstream.g
index fd69a6e4af..10bfcd491c 100644
--- a/src/corelib/serialization/qxmlstream.g
+++ b/src/corelib/serialization/qxmlstream.g
@@ -291,7 +291,7 @@ public:
 
     QIODevice *device;
     bool deleteDevice;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     QTextCodec *codec;
     QTextDecoder *decoder;
 #endif
@@ -584,7 +584,7 @@ bool QXmlStreamReaderPrivate::parse()
         lockEncoding = true;
         documentVersion.clear();
         documentEncoding.clear();
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
         if (decoder && decoder->hasFailure()) {
             raiseWellFormedError(QXmlStream::tr("Encountered incorrectly encoded content."));
             readBuffer.clear();
diff --git a/src/corelib/serialization/qxmlstream.h b/src/corelib/serialization/qxmlstream.h
index 2350d12dd6..d30c6bc01f 100644
--- a/src/corelib/serialization/qxmlstream.h
+++ b/src/corelib/serialization/qxmlstream.h
@@ -478,7 +478,7 @@ public:
     void setDevice(QIODevice *device);
     QIODevice *device() const;
 
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     void setCodec(QTextCodec *codec);
     void setCodec(const char *codecName);
     QTextCodec *codec() const;
diff --git a/src/corelib/serialization/qxmlstream_p.h b/src/corelib/serialization/qxmlstream_p.h
index f8b1ede943..61f501f81b 100644
--- a/src/corelib/serialization/qxmlstream_p.h
+++ b/src/corelib/serialization/qxmlstream_p.h
@@ -788,7 +788,7 @@ public:
 
     QIODevice *device;
     bool deleteDevice;
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     QTextCodec *codec;
     QTextDecoder *decoder;
 #endif
@@ -1081,7 +1081,7 @@ bool QXmlStreamReaderPrivate::parse()
         lockEncoding = true;
         documentVersion.clear();
         documentEncoding.clear();
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
         if (decoder && decoder->hasFailure()) {
             raiseWellFormedError(QXmlStream::tr("Encountered incorrectly encoded content."));
             readBuffer.clear();
diff --git a/src/corelib/tools/qstring.cpp b/src/corelib/tools/qstring.cpp
index 82a065efc0..0a8b2b4238 100644
--- a/src/corelib/tools/qstring.cpp
+++ b/src/corelib/tools/qstring.cpp
@@ -44,7 +44,7 @@
 #include "qregularexpression.h"
 #endif
 #include "qunicodetables_p.h"
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
 #include <qtextcodec.h>
 #endif
 #include <private/qutfcodec_p.h>
@@ -5057,11 +5057,11 @@ static QByteArray qt_convert_to_local_8bit(QStringView string)
 {
     if (string.isNull())
         return QByteArray();
-#ifndef QT_NO_TEXTCODEC
+#if QT_CONFIG(textcodec)
     QTextCodec *localeCodec = QTextCodec::codecForLocale();
     if (localeCodec)
         return localeCodec->fromUnicode(string);
-#endif // QT_NO_TEXTCODEC
+#endif // textcodec
     return qt_convert_to_latin1(string);
 }
 
@@ -5255,13 +5255,13 @@ QString QString::fromLocal8Bit_helper(const char *str, int size)
         QStringDataPtr empty = { Data::allocate(0) };
         return QString(empty);
     }
-#if !defined(QT_NO_TEXTCODEC)
+#if QT_CONFIG(textcodec)
     if (size < 0)
         size = qstrlen(str);
     QTextCodec *codec = QTextCodec::codecForLocale();
     if (codec)
         return codec->toUnicode(str, size);
-#endif // !QT_NO_TEXTCODEC
+#endif // textcodec
     return fromLatin1(str, size);
 }
 
diff --git a/src/corelib/tools/qstringbuilder.cpp b/src/corelib/tools/qstringbuilder.cpp
index 73748e55a3..081d7136a7 100644
--- a/src/corelib/tools/qstringbuilder.cpp
+++ b/src/corelib/tools/qstringbuilder.cpp
@@ -38,7 +38,6 @@
 ****************************************************************************/
 
 #include "qstringbuilder.h"
-#include <QtCore/qtextcodec.h>
 #include <private/qutfcodec_p.h>
 
 QT_BEGIN_NAMESPACE