The /Zs option tells the compiler to check only the syntax of the source files that follow the option on the command line. This option provides a quick way to find and correct syntax errors before you try to compile and link a source file.
When you give the /Zs option, the compiler does not generate code or produce object files, object listings, or executable files. The compiler, however, does display error messages if the source file has syntax errors.
Example
CL /Zs TEST*.C
This command causes the compiler to perform a syntax check on all source files in the current working directory that begin with TEST and end with the .C extension. The compiler displays messages for any errors found.