At the start of a job include info such as JOB_ARGS the log location and anything in JOB_LOG_START (eg TARGET_SPEC=${TARGET_SPEC})
jobs.mk automates -j$JOB_MAX and capturing build log based on target. Compute a default for JOB_MAX in local.sys.mk Reviewed by: stevek, imp Differential Revision: https://reviews.freebsd.org/D39683