We have a tool that generates some code (.cs) files that are used to build the project.

The tool is run during the pre-build step, but the files are updated in the solution only after the build, which means the build needs to be performed twice to clear the errors after a change to the input.

Example:

• Modify Tool Input File
• Run Build
  • Tool Runs and changes source file
• Build Fails
• Run Build
  • Tool Runs and changes source file (but it doesn's actually change, because the input remains the same)
• Build Succeeds

Any ideas how we can do away with the double build, and still let our tool be run from VS?

Thanks guys!