[bug #66499] Parameter for option -j seems not to be validated and can cause hangs

Follow-up Comment #9, bug #66499 (group make):

Sure! I was testing a patch for gcc
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114542) regarding the -flto=<n>
option.
When testing edge cases for <n>, I found gcc hanging, which was caused by a
blocked GNUmake child process.

Of course these values were quite extreme, but at that time i did not know,
that GNUmake would be invoked for parallelism.

Thanks for your work!


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