Cd into build directory before starting.

shellgenerator.py

@@ -34,6 +34,8 @@ class ShellGenerator():
         outfile.write('echo This is an autogenerated shell script build file for project \\"%s\\".\n'
                       % self.interpreter.get_project())
         outfile.write('echo This is experimental and most likely will not work!\n')
+        cdcmd = ['cd', self.environment.get_build_dir()]
+        outfile.write(' '.join(shell_quote(cdcmd)) + '\n')
         self.generate_commands(outfile)
         outfile.close()
         os.chmod(outfilename, stat.S_IREAD | stat.S_IWRITE | stat.S_IEXEC |\