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Dangers
when using archives
It is
important to be careful when using parallel execution (the -j
switch; see Parallel
execution) 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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