Сделал так

Код AS3:
private function runMxmlc():void
{
var argVector:Vector.<String> = new Vector.<String>();
argVector.push(" -output " + SWF_PATH + "lib.swf");
argVector.push(LIB_CLASS_PATH + "Main.as");
argVector.push(" -static-link-runtime-shared-libraries=true");
var startupInfo:NativeProcessStartupInfo = new NativeProcessStartupInfo();
startupInfo.arguments = argVector;
startupInfo.executable = new File("C:/docs/programs/flex_sdk_4.1.0.16076/bin/mxmlc.exe");
_process = new NativeProcess();
_process.addEventListener(ProgressEvent.STANDARD_OUTPUT_DATA, onProcessEvent);
_process.addEventListener(ProgressEvent.STANDARD_ERROR_DATA, onProcessEvent);
_process.addEventListener(NativeProcessExitEvent.EXIT, onProcessEvent);
_process.addEventListener(IOErrorEvent.STANDARD_OUTPUT_IO_ERROR, onProcessEvent);
_process.addEventListener(IOErrorEvent.STANDARD_ERROR_IO_ERROR, onProcessEvent);
_process.start(startupInfo);
}
вот лог:

Код:
argVector = -output C:\docs\work\flash\progects\GenLib\bin\files\just.swf C:\docs\work\flash\progects\GenLib\bin\files\tmp\Main.as -static-link-runtime-shared-libraries=true
standardOutputData
Loading configuration file C:\docs\programs\flex_sdk_4.1.0.16076\frameworks\flex-config.xml
standardOutputData
Adobe Flex Compiler (mxmlc)
Version 4.1.0 build 16076
Copyright (c) 2004-2009 Adobe Systems, Inc. All rights reserved.
standardErrorData
Error: unable to open ' -static-link-runtime-shared-libraries=true'
standardErrorData
Use 'mxmlc -help' for information about using the command line.
exit
запустился mxmlc, но параметры я передаю как то не так...
___________________
Нашел ответ:

Код AS3:
var argVector:Vector.<String> = new Vector.<String>();
argVector.push(" -output=" + SWF_PATH + "lib.swf");
argVector.push(LIB_CLASS_PATH + "Main.as");
после -output должен стоять знак "="...
alatar спасибо за помощь