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Add directory to PATH environment variable, globally and programmatically [message #1278740]

Thu, 27 March 2014 15:47

Eclipse User

Hi,

Can anyone tell me the best way to add a directory to the global system PATH environment programmatically, either in java or statically, perhaps in plugin_customization.ini?

(See attached source)
I have used this to append the environment

UserDefinedEnvironmentSupplier udes = EnvironmentVariableManager.fUserSupplier

but I don't think its the right approach. Once set changes to the underlying environment set outside Eclipse don't get reflected when you restart with the same workspace. I just want something to append my PATH version to the global, system PATH version.

Any suggestions appreciated.

cheers john

Re: Add directory to PATH environment variable, globally and programmatically [message #1282580 is a reply to message #1278740]

Wed, 02 April 2014 10:25

Eclipse User

I solved this. In case anyone is wondering this is my solution:

    import org.eclipse.cdt.core.envvar.IEnvironmentVariable;
    import org.eclipse.cdt.internal.core.envvar.EnvironmentVariableManager;
    import org.eclipse.cdt.internal.core.envvar.UserDefinedEnvironmentSupplier;
    import org.eclipse.cdt.managedbuilder.envvar.IBuildEnvironmentVariable;

    ...


      /**
       * Add a path to the beginning of the PATH environment variable.
       * This path is not persisted so its ok to perform this on every
       * startup. The existing system PATH is maintained.
       * Note:
       * 1) the PATH modification does not appear in Environment preference page 
       * (Window > Preferences > C/C++ > Build > Environment)! Rather it appears
       * in every project property >  C/C++ Build > Environment > PATH variable.
       * 2) each call to this method overwrites previous values in PATH. If multiple
       * paths are to be prepended they should be concatenated in a single call.
       * 
       * @param path The directory or directories to prepend, separated with the
       * relevant path delimiter.
       */
      public  static void prependToSystemPath(String path) {
        EnvironmentVariableManager.fUserSupplier.createOverrideVariable("PATH", path,
            IBuildEnvironmentVariable.ENVVAR_PREPEND,
            EnvironmentVariableManager.getDefault().getDefaultDelimiter());
      }

and I use it thus:

      prependToSystemPath("c:\mypath1;c:\mypath2");

The benefit is this code can be called everytime Eclipse starts (I use <extension point="org.eclipse.ui.startup">) and each time it will prepend my path to whatever system path is defined at that time. This means, for example, you can use a workspace on Windows during one Eclipse session and then subsequently use the same workspace on a Linux system and the system path is reset for each start.

Re: Add directory to PATH environment variable, globally and programmatically [message #1283379 is a reply to message #1282580]

Thu, 03 April 2014 06:55

Eclipse User

Hi,

i use a batch file (on Windows), works like a charm.

@echo off
PATH=C:\mingw64\bin;%PATH%
start eclipse.exe

One can use different batches to select different compiler paths if needed.

regards,
Klaus

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