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(make.info.gz) Archive Pitfalls

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 11.3 Dangers When Using Archives
 ================================
 
 It is important to be careful when using parallel execution (the `-j'
 switch;  Parallel Execution Parallel.) and archives.  If multiple
 `ar' commands run at the same time on the same archive file, they will
 not know about each other and can corrupt the file.
 
    Possibly a future version of `make' will provide a mechanism to
 circumvent this problem by serializing all commands that operate on the
 same archive file.  But for the time being, you must either write your
 makefiles to avoid this problem in some other way, or not use `-j'.
 
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