CLion 2016.2 Help

Tuning CLion

In this part:

Changing CLion properties

CLion makes it possible to change *.vmoptions and files without editing them in the CLion installation folder.

To create an empty file or to copy *.vmoptions file, choose the Help | Edit Custom Properties or Help | Edit Custom VM Options on the main menu respectively. Refer to the menu items description for details.

Managing *.vmoptions file

The location of the *.vmoptions file depends on the operating system you are currently using:

  • For Windows systems: <CLion installation folder>/bin/clion64.vmoptions
  • For *NIX systems: <CLion installation folder>/bin/clion64.vmoptions
  • For OS X systems, you have to make a copy of the clion.vmoptions file in the IDE preferences folder and then edit this copy. The reason is that app bundle is signed and you should not modify any files inside the bundle.
    The file /Applications/ should be copied to ~/Library/Preferences/clionXX/clion.vmoptions

To avoid editing files in the CLion installation folder, one should:

  1. Do one of the following:
    • Use the main menu command Help | Edit Custom VM Options to create a copy of the clion.vmoptions file in the user home. Refer to Edit Custom VM Options for details.
    • Copy the existing file from the CLion installation folder somewhere and save the path to this location in the environment variable CL_VM_OPTIONS.
    • Copy the existing file <CLion installation folder>/bin/clion$BITS.vmoptions from the CLion installation folder into the location under user home.
  2. Edit this file in the new location.

If CL_VM_OPTIONS environment variable is defined, or the *.vmoptions file exists, then this file is used instead of the one located in the CLion installation folder.

Example: Increasing the heap size

To increase CLion heap size, you should copy the original clion.vmoptions file to the above-mentioned location, and then modify the -Xmx setting.

Managing file

The file, located in the bin directory of the CLion installation folder, should not be edited. Instead of editing the original, create file in the location specified below, open it for editing and add the required properties.

So, depending on your platform:

  • For Windows: in %USERPROFILE%\.clionXX
  • For *NIX: in ~/.clionXX
  • For OS X: in ~/Library/Preferences/clionXX

Example: Changing case of unicode literals

CLion allows defining whether non-ascii characters should use literals like '\u00AB' or '\00ab'.

This behavior is controlled by the system property idea.native2ascii.lowercase. By default, upper case characters are used.

If it is desirable to use lower case characters, create the file in the location specified above, open it for editing and add the following line:


Specifying custom JDK, properties or vmoptions files across platforms

A custom JDK, *.properties and *.vmoptions files are specified across platforms in a unified way.

All the launchers look at the following environment variables:


See Also

Last modified: 20 July 2016