[QT] detailed explanation of *.pro, *.pri, *.prf, *.prl files

1、*.pro
qmake The engineering of (project) file , Everyone must be very familiar with this . Direct example ：

This is a typical Qt Of the sample program .pro file (propriprfprl.pro)：

TEMPLATE = app
CONFIG += QT
QT += core gui
 
TARGET = propriprfprl
 
SOURCES += main.cpp/
        widget.cpp
HEADERS  += widget.h
FORMS    += widget.ui

• front 3 Line is qmake The default value of
• TARGET This line specifies the project name

2、*.pri

i What does that mean? ？ contain (include) The first letter of . Be similar to C、C++ Header file in , Anyway, you can put *.pro Part of the document is put into a separate *.pri In the file , And then include .

Take the previous example , Separate the settings of the source file , Put it in propriprfprl.pri In the file ：

SOURCES += main.cpp/
        widget.cpp
HEADERS  += widget.h
FORMS    += widget.ui

At this time ,propriprfprl.pro The file can be simplified to ：

TEMPLATE = app
CONFIG += QT
QT += core gui
 
TARGET = propriprfprl
include(propriprfprl.pri)

• What's the use ？ For this example , It's really useless , Instead, there is one more file , More trouble .
• But , If a larger project , Contains multiple *.pro What about the documents , these pro Need some common settings or required files , At this time, it is necessary .

3、*.prf

f God horse Dongdong again ？ characteristic (feature) First character

and pri File similar , This file is also to be included pro Of documents

• It's just ： It's more hidden
• You often deal with it , May have been blind
• Actually, this example has been used , This is it. CONFIG+=QT

When we're in CONFIG When you specify something in ,qmake Will try to load the corresponding feature file ：

• Qt Install under directory mkspecs/features/qt.prf
• features The file name of the file must be lowercase
• qmake Which directories to search features What about the documents ？
  For the time being, I only know what I mentioned above $$QTDIR/mkspecs/features That's all right.

Write your own features file ：propriprfprl.prf

win32:CONFIG += console

• by win32 Add console to your program , A little many times in one fell swoop .
• Put this file in the directory we mentioned earlier

And then in pro Add in file

CONFIG += propriprfprl

See and CONFIG += console The same effect ？

notes ： We can also use load Command to load prf file , For example, the previous command can be considered equivalent to

load(propriprfprl)

4、*.prl

l This thing is easy to understand , link (link) First character . Mainly related to the generation and use of static libraries ( The dynamic library can also have this file , Go to Qt Install under directory lib Just look under the directory ).

• When generating static libraries , We need to use the following configuration ( And then generate... With the same name as the library file *.prl file )

CONFIG += create_prl

• When engineering TEMPLATE by app when , The following instructions will be automatically added ( When looking for library files , Will try to find the corresponding *.prl file )

CONFIG += link_pri

So what is the use of this file ？ Take an example that you may be familiar with QextSerialPort1.2 This library (windows Under the circumstances )：

• Compile time , need setupapi.lib advapi32.lib user32.lib These library files
• After compiling into a static library , It does not contain this 3 Library file information
• therefore , When we use this QextSerialPort Static library , You still need to specify these library files

If there is prl What about the documents , This file will contain the dependency information ：

QMAKE_PRL_BUILD_DIR = D:/buildlib
QMAKE_PRO_INPUT = buildlib.pro
QMAKE_PRL_TARGET = qextserialport-1.2
QMAKE_PRL_CONFIG = include_source_dir incredibuild_xge lex yacc warn_on uic resources incremental_off windows release ReleaseBuild Release build_pass qt warn_on release incremental flat link_prl precompile_header autogen_precompile_source copy_dir_files debug_and_release debug_and_release_target embed_manifest_dll embed_manifest_exe stl exceptions rtti mmx 3dnow sse sse2 release ReleaseBuild Release build_pass qt qextserialport-buildlib create_prl qextserialport-uselib qextserialport-static static debug_and_release build_all release ReleaseBuild Release build_pass no_autoqmake staticlib static moc thread
QMAKE_PRL_LIBS = setupapi.lib advapi32.lib user32.lib d://Qt//4.7.0//lib//QtGui4.lib d://Qt//4.7.0//lib//QtCore4.lib