qmltc: export generated classes

Add QMLTC_EXPORT_MACRO_NAME and QMLTC_EXPORT_FILE_NAME arguments to
qt_add_qml_module() that allows the user to export qmltc-generated code
from its library. The qmltc-generated code will include the header-file
specified in QMLTC_EXPORT_FILE_NAME and will be exported with the macro
specified by QMLTC_EXPORT_MACRO_NAME.
Leave both options unspecified to not export the code generated by
qmltc.

Describe the options in the documentation and write a test to see if the
class really has an export macro in the generated code:
1) tst_qmltc_qprocess will test if the macro and the header are correctly
inserted in the generated code.
2) tst_qmltc_{no,}diskcache will test if the generated code can still be
   used from a static library.

Fixes: QTBUG-106840
Task-number: QTBUG-96040
Change-Id: I554f03bcdf043e8114e42f51a7289a5c00de4f89
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 34 insertions, 0 deletions

diff --git a/tests/auto/qml/qmltc_qprocess/tst_qmltc_qprocess.cpp b/tests/auto/qml/qmltc_qprocess/tst_qmltc_qprocess.cpp
index 7f12f29342..f0b99fcdf0 100644
--- a/tests/auto/qml/qmltc_qprocess/tst_qmltc_qprocess.cpp
+++ b/tests/auto/qml/qmltc_qprocess/tst_qmltc_qprocess.cpp
@@ -51,6 +51,7 @@ private slots:
     void topLevelComponent();
     void dashesInFilename();
     void invalidSignalHandlers();
+    void exports();
 };
 
 #ifndef TST_QMLTC_QPROCESS_RESOURCES
@@ -261,5 +262,38 @@ void tst_qmltc_qprocess::invalidSignalHandlers()
     }
 }
 
+static QString fileToString(const QString &path)
+{
+    QFile f(path);
+    if (f.open(QIODevice::ReadOnly))
+        return QString::fromLatin1(f.readAll());
+    return QString();
+}
+
+void tst_qmltc_qprocess::exports()
+{
+    const QString fileName = u"dummy.qml"_s;
+    QStringList extraArgs;
+    extraArgs << "--export"
+              << "MYLIB_EXPORT_MACRO"
+              << "--exportInclude"
+              << "exportheader.h";
+    const auto errors = runQmltc(fileName, true, extraArgs);
+
+    const QString headerName = m_tmpPath + u"/"_s + QFileInfo(fileName).baseName() + u".h"_s;
+    const QString header = fileToString(headerName);
+    const QString implementationName =
+            m_tmpPath + u"/"_s + QFileInfo(fileName).baseName() + u".cpp"_s;
+    const QString implementation = fileToString(implementationName);
+
+    QCOMPARE(errors.size(), 0);
+
+    QVERIFY(header.contains(u"class MYLIB_EXPORT_MACRO dummy : public QObject\n"_s));
+    QVERIFY(!implementation.contains(u"MYLIB_EXPORT_MACRO"_s));
+
+    QVERIFY(header.contains(u"#include \"exportheader.h\"\n"_s));
+    QVERIFY(!implementation.contains(u"exportheader.h"_s));
+}
+
 QTEST_MAIN(tst_qmltc_qprocess)
 #include "tst_qmltc_qprocess.moc"