- Qt 6.4
- Qt Linguist Manual
- CMake Commands in Qt6 LinguistTools
- qt_add_lupdate
- Qt 6.4.2 Reference Documentation

# qt_add_lupdate

Add targets to generate or update Qt Linguist .ts files.

The command is defined in the `LinguistTools` component of the `Qt6` package. Load the package with:

     find_package(Qt6 REQUIRED COMPONENTS LinguistTools)

This command was introduced in Qt 6.2.

## Synopsis

     qt_add_lupdate(target TS_FILES file1.ts [file2.ts ...]
                    [SOURCES source1.cpp [sources2.cpp ...]]
                    [INCLUDE_DIRECTORIES directory1 [directory2 ...]]
                    [NO_GLOBAL_TARGET]
                    [OPTIONS ...])

If versionless commands are disabled, use `qt6_add_lupdate()` instead. It supports the same set of arguments as this command.

## Description

Creates a target `${target}_lupdate` to generate or update Qt Linguist `.ts` files with lupdate.

The parameter `target` is an existing executable or library target that contains sources with translatable strings.

The `.ts` files must be specified with the argument `TS_FILES`.

This function is designed to be used in conjunction with qt_add_lrelease. See also the convenience wrapper qt_add_translations.

## Sources and Include Directories

By default, `qt_add_lupdate` extracts the source files and include directories from the given target and passes them to `lupdate`.

With `SOURCES` one may explicitly specify source files that contain translatable strings. This turns off the automatic extraction of source files from the target.

`INCLUDE_DIRECTORIES` can be used to explicitly specify include directories. This turns off the automatic extraction of include directories from the target.

## Options

You can set additional `OPTIONS` that should be passed when `lupdate` is invoked. You can find possible options in the lupdate documentation.

## Umbrella Target

In addition to the target `${target}_lupdate`, an umbrella target `update_translations` is created. This target will build all `${target}_lupdate` targets that were created with `qt_add_lupdate`.

Pass `NO_GLOBAL_TARGET` to `qt_add_lupdate` to prevent this behavior.

The name of this target can be overridden by setting the variable `QT_GLOBAL_LUPDATE_TARGET` before calling `qt_add_lupdate`.

## Examples

Add the targets `myapp_lupdate` and `update_translations` for updating the `.ts` file of an application `myapp`.

     qt_add_lupdate(myapp TS_FILES myapp_de.ts)