The Meson Build System
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59 lines
2.4 KiB
59 lines
2.4 KiB
8 years ago
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short-description: Simple project step by step explanation
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...
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# Meson sample
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A Meson file that builds an executable looks like this.
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```meson
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project('simple', 'c')
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executable('myexe', 'source.c')
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```
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All Meson build definitions begin with the `project` command. It specifies the name of the project and what programming languages it uses. Here the project is called *simple* and it uses only the C programming language. All strings are single-quoted.
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On the next line we define a *build target*, in this case an executable called *myexe*. It consists of one source file. This is all the code that a user needs to write to compile an executable with Meson.
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Variables are fully supported. The above code snippet could also have been declared like this.
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```meson
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project('simple', 'c')
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src = 'source.c'
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executable('myexe', src)
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```
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Most executables consist of more than one source file. The easiest way to deal with this is to put them in an array.
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```meson
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project('simple', 'c')
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src = ['source1.c', 'source2.c', 'source3.c']
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executable('myexe', src)
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```
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Meson also supports the notion of *keyword arguments*. Indeed most arguments to functions can only be passed using them. The above snippet could be rewritten like this.
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```meson
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project('simple', 'c')
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src = ['source1.c', 'source2.c', 'source3.c']
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executable('myexe', sources : src)
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```
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These two formats are equivalent and choosing one over the other is mostly a question of personal preference.
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The `executable` command actually returns an *executable object*, which represents the given build target. It can be passed on to other functions, like this.
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```meson
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project('simple', 'c')
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src = ['source1.c', 'source2.c', 'source3.c']
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exe = executable('myexe', src)
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test('simple test', exe)
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```
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Here we create a unit test called *simple test*, and which uses the built executable. When the tests are run with the `ninja test` command, the built executable is run. If it returns zero, the test passes. A non-zero return value indicates an error, which Meson will then report to the user.
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A note to Visual Studio users
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-----
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There's a slight terminology difference between Meson and Visual Studio. A Meson *project* is the equivalent to a Visual Studio *solution*. That is, the topmost thing that encompasses all things to be built. A Visual Studio *project* on the other hand is the equivalent of a Meson top level build target, such as an executable or a shared library.
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