QT learning (II) -.Pro file explanation

One 、.pro Explanation of the contents of the document

.pro File is qmake Used to generate makefile Intermediate file of file .
New simple Qt engineering , Default generation .pro The contents of the document are as follows , See note for explanation ：

# [QT+= ] grammar , Define the Qt modular 
QT       += core gui
#  because Qt5 take widgets Module from gui The module is independent , So define Qt Major version greater than 4 Include widgets modular 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

#  Compile macro , Use c++17 compile 
CONFIG += c++17
#  It's fine too  CONFIG -=
# CONFIG -= debug  Don't compile debug type 

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

#  The path of the source file that needs to be compiled （ The relative path of the project root directory ）
SOURCES += \
    main.cpp \
    widget.cpp

#  The path of the header file that needs to be compiled （ The relative path of the project root directory ）
HEADERS += \
    widget.h

#  It needs to be compiled ui File path （ The relative path of the project root directory ）
FORMS += \
    widget.ui

#  I only know that the target executable file path is set , Unable to understand the specific grammar , If you know the message in the welcome comment area 
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

In addition to some default fields of the project ,.pro There are other fields in the file ：

#  Name of the target executable , Do not specify the default project name 
TARGET = exe_name

#  The storage directory of the target executable , Do not specify default as realse Catalog 
#  Several symbols for specifying the directory ：
#  macro  $$PWD  Represents the current directory and  ./  equivalent 
# ../  On behalf of the previous Directory 
DESTDIR = exe_dir

#  Compile macro switch , Compile differently according to different macros 
DEFINES += defines

# obj File directory , namely  .o  file 
OBJECTS_DIR = obj_dir

#  Resource file path , Including pictures 、 Audio etc. （ The relative path of the project root directory ）
RESOURCES += res.rc

#  Link library path （ The relative path of the project root directory ）
DEPENDPATH += depend_dir

#  Link library files （ The relative path of the project root directory ）
LIBS += -Llib_name
#  You can also write a link library file with a path directly 
LIBS += -Llib_dir_name

#  Reference library header file path （ The relative path of the project root directory ）
INCLUDES += include_dir

#  The type of template used in the project 
TEMPLATE = app
TEMPLATE = lib

Two 、qmake Generate makefile The process

to be continue…