How to put generated files (e.g. object files) into a separate folder when using Qt/qmake?

问题

I have a Qt project that uses qmake. To improve clarity and readability, I'd like to keep the

source files
build system
generated files (such as object files)

separate.

So my first step was putting the source files into a src/ sub directory:

myproject/
    myproject.pro
    src/
        main.cpp
        MainWindow.ui
        ...

That way I separated the source files from the build system (*.pro). However, when I then run qmake followed by make, the generated files (object files, etc) are placed into the main project folder:

myproject/
    myproject.pro
    Makefile
    main.o
    ui_MainWindow.h
    ...
    src/
        main.cpp
        MainWindow.ui
        ...

Well, at least they weren't put into the src/ folder, but how do I specify that they are put into another sub folder such as build/?

myproject/
    myproject.pro
    Makefile
    build/
        main.o
        ui_MainWindow.h
        ...
    src/
        main.cpp
        MainWindow.ui
        ...

(BTW, I don't care where the target binary myproject is put, but I guess it should be placed directly into project folder rather than into build/.)

回答1:

You can add the following lines to your *.pro file:

DESTDIR=bin #Target file directory
OBJECTS_DIR=generated_files #Intermediate object files directory
MOC_DIR=generated_files #Intermediate moc files directory

A list of variables is available at the following locations:

Qt 4.8
Qt 5

回答2:

https://wiki.qt.io/Undocumented_QMake#Config_features

object_with_source — outputs each object file into the same directory as its source file (replaced by object_parallel_to_source in the latest versions).
object_parallel_to_source — recreate source folder tree for object files (replaces object_with_source).

in *.pro write

CONFIG += object_parallel_to_source

来源：https://stackoverflow.com/questions/3440387/how-to-put-generated-files-e-g-object-files-into-a-separate-folder-when-using

标签

qmake

object-files