如何配置qmake的.pro文件以生成含自定义预构建步骤的Makefile？

Got it, let's walk through how to set up a custom pre-build step in your .pro file so qmake generates the exact Makefile structure you want—where the first target depends on both pre-build and release, with custom actions under the pre-build rule.

Step 1: Define Your Pre-Build Target #

First, create a custom target for your pre-build actions. This tells qmake what commands to run when the pre-build target is triggered:

# Define the pre-build target and its commands
pre-build.target = pre-build
pre-build.commands = echo "Running pre-build steps..." && \
    # Add your actual operations here—examples below:
    cp ./config.template ./src/config.h && \
    python ./scripts/generate_resources.py

• Use && to chain multiple commands, or line breaks with \ for readability.
• Replace the example commands with whatever you need (file copying, code generation, environment setup, etc.).

Step 2: Register the Target with qmake #

Next, add your pre-build target to qmake's list of extra targets. This ensures qmake includes the target rule in the generated Makefile:

QMAKE_EXTRA_TARGETS += pre-build

Step 3: Adjust the Default first Target Dependencies #

By default, qmake's generated Makefile sets first: release (or first: debug depending on your build mode). To modify this to first: pre-build release, redefine the first target's dependencies:

# Override the first target to depend on pre-build first, then release
first.depends = pre-build release
first.commands = @true  # Empty command—first just triggers its dependencies

The @true is a no-op command; since first only exists to trigger its dependent targets, we don't need it to execute any actual logic.

Full Example .pro File Snippet #

Putting it all together, here's how your .pro file might look:

QT += core gui widgets

TARGET = MyQtApp
TEMPLATE = app

# Pre-build setup
pre-build.target = pre-build
pre-build.commands = echo "Starting pre-build tasks..." && \
    mkdir -p ./build/assets && \
    cp ./assets/* ./build/assets/

QMAKE_EXTRA_TARGETS += pre-build

# Modify default target dependencies
first.depends = pre-build release
first.commands = @true

# Rest of your .pro file content
SOURCES += main.cpp \
    mainwindow.cpp

HEADERS += mainwindow.h

What Happens When You Run qmake? #

After running qmake, the generated Makefile will have:

• A pre-build rule with your custom commands
• The first target defined as first: pre-build release

Now when you run make, it will execute all your pre-build commands first, then proceed with the standard release build process.

Bonus: Target Debug and Release Builds #

If you want the pre-build step to run for both debug and release modes, adjust the dependencies to cover both targets:

first.depends = pre-build
release.depends = pre-build
debug.depends = pre-build

This way, no matter if you build debug or release, the pre-build steps run first.

内容的提问来源于stack exchange，提问作者Konstantin Utkin