QT Subdir - 未定义对 main 的引用 - 错误 [英] QT Subdir- Undefined reference to main - Error

问题描述

我有一个简单的 QT subdir 项目，其结构为

I have a simple QT subdir project with the structure of

TestProject/
    TestProject.pro
    Subdir1/
            Subdir1.pro
        sources/
            main.cpp
    Subdir2/
        Subdir2.pro
        headers/
            mainwindow.h
        sources/
            mainwindow.cpp

这是我的 .pro 文件测试项目.pro

Here are my .pro files TestProject.pro

TEMPLATE = subdirs
SUBDIRS += \
    Subdir1 \
    Subdir2

Subdir1.pro

Subdir1.pro

SOURCES += \
main.cpp

Subdir2.pro

Subdir2.pro

QT += sql

SOURCES += \
    mainwindow.cpp \
HEADERS += \
    mainwindow.h \

当我尝试运行应用程序时，出现以下错误:

When I try to run the application I get the following error:

(.text+0x18):-1: error: undefined reference to `main'

我在 Ubuntu 12.04 上使用 Qt Creator IDE.我花了整整一上午的时间试图弄清楚这一点，我必须在 .pro 文件中放入什么才能让 Qt 能够构建项目?

I am using the Qt Creator IDE on Ubuntu 12.04. I have spent all morining trying to figure this out, What must I put in the .pro files in order for Qt to be able to build the project?

提前致谢

推荐答案

看起来您想要做的是将所有源文件构建到一个可执行文件中.这不是 subdirs 模板的用途，而是用于创建单个 Makefile 来构建多个不同的目标(例如两个不同的可执行文件，或者一个可执行文件和一个库).

It looks like what you're trying to do is build all your source files into one executable. This is not what the subdirs template is for, it's for creating a single Makefile which builds several different targets (for example two different executables, or an executable and a library).

您可能想要的是只有一个 .pro 文件，例如

What you probably want is either to just have a single .pro file with e.g.

SOURCES = Subdir1/mainwindow.cpp Subdir1/main.cpp

或者您可以将 subdir pro 文件制作成(按照惯例).pri 文件.然后在顶层，您只需执行以下操作:

Or you can make the subdir pro files into (by convention) .pri files. Then at the top level you would just do:

include(Subdir1/Subdir1.pri)
include(Subdir2/Subdir2.pri)

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