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If a precompiled header file exists (either the default file or one
specified by /fh=filename), it is compared to the current compilation for
consistency.  A new precompiled header file is created and the new file
overwrites the old unless the following requirements are met:

 .  The current compiler options must match those specified when the
    precompiled header was created.
 .  The current working directory must match that specified when the
    precompiled header was created.
 .  The name of the first #include directive must match the one that was
    specified when the precompiled header was created.
 .  All macros defined prior to the first #include directive must have the
    same values as the macros defined when the precompiled header was
    created.  A sequence of #define directives need not occur in exactly the
    same order because there are no semantic order dependencies for #define
    directives.
 .  The value and order of include paths specified on the command line with
    /i options must match those specified when the precompiled header was
    created.
 .  The time stamps of all the header files (all files specified with
    #include directives) used to build the precompiled header must match
    those that existed when the precompiled header was created.