lupdate error: Qualifying with unknown namespace/class

user_818924 0
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I ran into a very peculiar error using lupdate v4.7.2. I got the error message

module/foo.cpp:6: Qualifying with unknown namespace/class ::foo

for a couple of classes in a project with about 50 classes. I boiled the problem down to a simple example:

src/project.pro:

QT       += core
TARGET = test
TEMPLATE = app

SOURCES += main.cpp \
           screen.cpp

HEADERS += screen.h

TRANSLATIONS += de.ts

src/module/foo.h:

namespace sp {
class foo {
    initWidgets();
};
} // namespace sp

src/module/foo.cpp:

#include <QString>
#include "module/foo.h"

namespace sp {
    foo::initWidgets() {
    QString bar = tr("bar");
}
} // namespace sp

main.cpp has an empty main function in it.

The code compiles (barring any copypasta mistakes I might have produced here), so the syntax is basically correct.

translation internationalization qt namespaces
7 Answers

This error occurs also if the tr()-macro is placed in too deeply nested subfolders.

E.g., in the following example, the command lupdate -noobsolete . -ts ts/* error message reads pwd/a/b/c/c.cpp:5: Qualifying with unknown namespace/class ::C.

QT       += core gui

SOURCES += \
    main.cpp \
    a/a.cpp \
    a/b/b.cpp \
    a/b/c/c.cpp

HEADERS += \
    a/a.h \
    a/b/b.h \
    a/b/c/c.h

TRANSLATIONS += \
    ts/foo.ts

However, as others have already mentioned, the *.ts-file seems to be updated correctly.

user_42489720

Some forward declarations seem to cause this warning too. Removing the 'template class MutexQList' line in this class example solves the issue in my case:

#include "bufferwriter.h"
#include "resampleworker.h"
#include "worker_help.h"

class Buffer;
class Project;

template <class T> class MutexQList;

class WorkerRegistry : public QObject
{
    Q_OBJECT
private:
    static WorkerRegistry *my_instance;

    MutexQList<BufferWriter *>*bw_list;                 ///< Liste mit registrierten BufferWriter Instanzen
    MutexQList<ResampleWorker *>*rw_list;               ///< Liste mit registrierten ResampleWorker Instanzen

public:
    static WorkerRegistry *instance();
    static WorkerRegistry &ref();
    static void destroy();
}
user_72003650
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