To create an object file from a C, C++, or assembly source file that is open in the File Editor pane, select Build This File from the Code window Build menu. If the file is associated with a user-defined project, it is built automatically using the makefile defined for that project. Otherwise, the Build dialog is displayed for you to enter the build details. It looks something like this:
Working Directory
Specify the directory for working files:
Select Same as Target if working files are in the same directory as the files that are loaded on the target.
Select Same as Makefile if working files are in the same directory as the makefile.
Select Specified if you want to specify another directory. Enter a directory name and path in the text box.
Target
Specify the target file, if it is not preloaded from a project. Click
to see a drop-down
list of previously used build targets.
Makefile
Specify the path and filename of the makefile that you want to use.
Click 
to display a list of files that you have worked with
recently. You can select one of those files, or the Select
File… option to display a Select
File dialog where you can browse for the file that you require.
Directory
If you select the Specified
radio button, under Working Directory, use this data field to enter the
name of the working directory. Click to display a list
of directories that you have worked with recently. You can select one
of those directories, or the Select Dir…
option to display a Select Directory
dialog where you can browse for the directory that you require.
Build Command
As you enter details, the command string is constructed and displayed
in this field. You can amend the command line before starting the build.
You can click to display a list of previously used command
lines.
Click Build to build the object file. The results are displayed in the Build tab of the Output pane. The Build dialog is closed.
Click Cancel to close the Build dialog without building the specified file.
When you have built the object file, you
can include it into an executable file for loading to your target processor
at a later time.