(make.info.gz) Archive Pitfalls
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11.3 Dangers When Using Archives
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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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(make.info.gz) Archive Update
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