File | Settings | Compiler | Flex Compiler
Use the Compiler > Flex Compiler page to select the Flex compiler for your project and to specify the associated settings.
|Compile with||Select which of the available Flex compilers should be used:
Whichever of the compiler options you use, IntelliJ IDEA keeps track of the modules where nothing has changed since the previous compilation. Consequently, the SWF and SWC files that are up-to-date are not compiled.
|Prefer ActionScript Compiler 2.0 for pure ActionScript build configurations||If this check box is selected, the ActionScript Compiler 2.0 (ASC 2.0) is used for pure ActionScript build configurations.|
|Parallel compilation with up to <this_many> threads or processes||Specify the maximum number of compilation threads (for the built-in compiler shell) or processes (for the mxml/compc compiler) to run simultaneously.|
|Compiler heap size||
Specify the maximum heap size available to the process that launches the compiler.
The default 512 Mb is suitable for most of the purposes. However, the built-in compiler shell, as a single-process compiler, may require more memory for large projects.
|VM options||If necessary, type the string to be passed to the VM when IntelliJ IDEA launches the compiler.
If you need more room to type, click next to the field to access the Flex Compiler VM options dialog where the text entry area is larger.
When specifying the options, follow these rules:
Language and Framework-Specific Guidelines: