Specific Programming ​

You may want to do specific programming such as platform specific programming for various reasons. The code in your project is platform-specific and easy to organize. Your platform-specific files are not included in the compilation.

File Annotation ​

File Annotation enables a source file to be classified by operating system or architecture at compile time. If there is a platform or operating system that does not comply with Annotation, the source file is not included in the compilation. This is a compiler feature that can help with platform specific development. These annotations are available for all supported operating systems and architects. Check out platform support documentations to see the supported operating systems and architectures.

Attachments should be placed at the end and separated by underscore. Up to two annotations can be used. If you use a single annotation, this annotation can be both an operating system and an archtitecture annotation. If you use two annotations, the first annotation must be the operating system and the second annotation must be architecture. If there is no underscore, the entire name can also be matched.

For example:

darwin.jule

arm64.jule

unix_amd64.jule

example_amd64.jule

example_windows_amd64.jule

example_darwin_arm64.jule

example_linux.jule

Test Files ​

You can use file annotation for test files. See Test Files section of the manual.

The build Directive ​

The build directive is a top directive that includes the source code file in the build based on the evaluation result using directive expressions. For more information about expressions, you can read the Directive Expressions section.

You can use this directive for platform specific programming or compilation specific programming such as writing tests for test compilations.

Variables ​

Your variables are set automatically by your compiler. There are variables for many situations. You can also read the variables section to get more ideas about platform specific variables.

Examples ​

Here is an example code:

#build (darwin || windows) && x64

The above expression will return true for windows and darwin operating systems with 64-bit architecture.

Another example:

#build unix && !darwin

The above expression will return true for all unix operating systems except darwin.