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# Running qmake

The behavior of `qmake` can be customized when it is run by specifying various options on the command line. These allow the build process to be fine-tuned, provide useful diagnostic information, and can be used to specify the target platform for your project.

- Command-Line Options

- Syntax
- Options
- Makefile Mode Options
- Project Mode Options

## Command-Line Options

### Syntax

The syntax used to run `qmake` takes the following simple form:

        qmake [mode] [options] files

`qmake` supports two different modes of operation: In the default mode, `qmake` will use the description in a project file to generate a Makefile, but it is also possible to use `qmake` to generate project files. If you want to explicitly set the mode, you must specify it before all other options. The `mode` can be either of the following two values:

- `-makefile`
  `qmake` output will be a Makefile.
- `-project`
  `qmake` output will be a project file.

The following `options` are used to specify both general and mode-specific settings. Options that only apply to the Makefile mode are described in the Makefile Mode Options section; options that influence the creation of project files are described in the Project File Options section.

The `files` argument represents a list of one or more project files, separated by spaces.

### Options

A wide range of options can be specified on the command line to `qmake` in order to customize the build process, and to override default settings for your platform. The following basic options provide usage information, specify where `qmake` writes the output file, and control the level of debugging information that will be written to the console:

- `-help`
  `qmake` will go over these features and give some useful help.
- `-o` file
  `qmake` output will be directed to file. If this option is not specified, `qmake` will try to use a suitable file name for its output, depending on the mode it is running in.
  If '-' is specified, output is directed to stdout.
- `-d`
  `qmake` will output debugging information.

For projects that need to be built differently on each target platform, with many subdirectories, you can run `qmake` with each of the following options to set the corresponding platform-specific variable in each project file:

- `-unix`
  `qmake` will run in unix mode. In this mode, Unix file naming and path conventions will be used, additionally testing for `unix` (as a scope) will succeed. This is the default mode on all Unices.
- `-macx`
  `qmake` will run in Mac OS X mode. In this mode, Unix file naming and path conventions will be used, additionally testing for `macx` (as a scope) will succeed. This is the default mode on Mac OS X.
- `-win32`
  `qmake` will run in win32 mode. In this mode, Windows file naming and path conventions will be used, additionally testing for `win32` (as a scope) will succeed. This is the default mode on Windows.

The template used for the project is usually specified by the `TEMPLATE` variable in the project file. We can override or modify this by using the following options:

- `-t` tmpl
  `qmake` will override any set `TEMPLATE` variables with tmpl, but only after the .pro file has been processed.
- `-tp` prefix
  `qmake` will add the prefix to the `TEMPLATE` variable.

The level of warning information can be fine-tuned to help you find problems in your project file:

- `-Wall`
  `qmake` will report all known warnings.
- `-Wnone`
  No warning information will be generated by `qmake`.
- `-Wparser`
  `qmake` will only generate parser warnings. This will alert you to common pitfalls and potential problems in the parsing of your project files.
- `-Wlogic`
  `qmake` will warn of common pitfalls and potential problems in your project file. For example, `qmake` will report whether a file is placed into a list of files multiple times, or if a file cannot be found.

### Makefile Mode Options

        qmake -makefile [options] files

In Makefile mode, `qmake` will generate a Makefile that is used to build the project. Additionally, the following options may be used in this mode to influence the way the project file is generated:

- `-after`
  `qmake` will process assignments given on the command line after the specified files.
- `-nocache`
  `qmake` will ignore the .qmake.cache file.
- `-nodepend`
  `qmake` will not generate any dependency information.
- `-cache` file
  `qmake` will use file as the cache file, ignoring any other .qmake.cache files found.
- `-spec` spec
  `qmake` will use spec as a path to platform and compiler information, and the value of `QMAKESPEC` will be ignored.

You may also pass `qmake` assignments on the command line; they will be processed before all of the files specified. For example:

        qmake -makefile -unix -o Makefile "CONFIG+=test" test.pro

This will generate a Makefile, from test.pro with Unix pathnames. However many of the specified options aren't necessary as they are the default. Therefore, the line can be simplified on Unix to:

        qmake "CONFIG+=test" test.pro

If you are certain you want your variables processed after the the files specified, then you may pass the `-after` option. When this is specified, all assignments on the command line after the `-after` option will be postponed until after the specified files are parsed.

### Project Mode Options

        qmake -project [options] files

In project mode, `qmake` will generate a project file. Additionally, you may supply the following options in this mode:

- `-r`
  `qmake` will look through supplied directories recursively
- `-nopwd`
  `qmake` will not look in your current working directory for source code and only use the specified `files`

In this mode, the `files` argument can be a list of files or directories. If a directory is specified, it will be included in the `DEPENDPATH` variable, and relevant code from there will be included in the generated project file. If a file is given, it will be appended to the correct variable, depending on its extension; for example, .ui files are added to `FORMS`, and .cpp files are added to `SOURCES`.

You may also pass assignments on the command line in this mode. When doing so, these assignments will be placed last in the generated project file.

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