In automatic PCH processing mode the compiler indicates that
a PCH file is obsolete, and deletes it, under the following circumstances:
if the PCH file is based on at least one out-of-date
header file but is otherwise applicable for the current compilation
if the PCH file has the same base name as the source
file being compiled, for example, xxx.pch and xxx.c,
but is not applicable for the current compilation, for example,
because you have used different command-line options.
These describe some common cases. You must delete other PCH
files as required.
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