How can I give the Intellij compiler more heap space?

When I make an Intellij project, I keep getting the following out of memory error.

I already increased my heap size in idea.vmoptions:

-Xms128m
-Xmx2048m
-XX:MaxPermSize=1024m
-XX:ReservedCodeCacheSize=64m
-ea

But I still get this error:

Information:The system is out of resources.
Information:Consult the following stack trace for details.
Information:java.lang.OutOfMemoryError: Java heap space
Information:    at com.sun.tools.javac.util.Position$LineMapImpl.build(Position.java:139)
Information:    at com.sun.tools.javac.util.Position.makeLineMap(Position.java:63)
Information:    at com.sun.tools.javac.parser.Scanner.getLineMap(Scanner.java:1105)
Information:    at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:512)
Information:    at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:550)
Information:    at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:804)
Information:    at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:727)
Information:    at com.sun.tools.javac.main.Main.compile(Main.java:353)
Information:    at com.sun.tools.javac.main.Main.compile(Main.java:279)
Information:    at com.sun.tools.javac.main.Main.compile(Main.java:270)
Information:    at com.sun.tools.javac.Main.compile(Main.java:69)
Information:    at com.sun.tools.javac.Main.main(Main.java:54)
Information:    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Information:    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Information:    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Information:    at java.lang.reflect.Method.invoke(Method.java:597)
Information:    at com.intellij.rt.compiler.JavacRunner.main(JavacRunner.java:71)
Information:Compilation completed with 1 error and 0 warnings
Information:1 error
Information:0 warnings
Error:Compiler internal error. Process terminated with exit code 3

What am I missing?

Current version:

Settings (Preferences on Mac) | Build, Execution, Deployment | Compiler | Build process heap size.

Older versions:

Settings (Preferences on Mac) | Compiler | Java Compiler | Maximum heap size.

Compiler runs in a separate JVM by default so IDEA heap settings that you set in idea.vmoptions have no effect on the compiler.

Since IntelliJ 2016, the location is File | Settings | Build, Execution, Deployment | Compiler | Build process heap size.

I had a similar problem with Ant build (started by hand from IDEA GUI). In my case there was the right solution to right click on the Ant task, choose properties and set a higher value to "Maximum heap space (Mb):" and "Maximum stack space (Mb):" input fields.