More than 64 jobs

[Md Abdur Rahim]

When specifying the number of jobs, any value greater than MAXJOBS (in jam.h) eventually leads to a segfault when setting up the file descriptors. The jam.h header indicates that MAXJOBS is "silently enforced". But looking at jam.c, the parsing of the -j option (indeed, even PARALLELISM if set) does not limit the maximum number of jobs.

In some places, MAXJOBS is enforced (notably read_output() in execnt.c). But in other places, 'globs.jobs' is not bounded, such as in populate_file_descriptors().

Perhaps globs.jobs should be limited to MAXJOBS in main()?