A precompiled header is a combination of a plain header with a companion
special file (.pch/.gch).
The companion file is generated from a source file that is designated as the
Precompiled Header creator ('/Yc' on MSVC).
Every other source file is told to use the special file ('/Yu' on MSVC), the
source file compilation will fail if the special file is missing.
CPython/third party runtimes will only need to ship this special file with the
compiled code, the only downside is a burden of checking the checksum of the
file before it's used in a compile process.
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