[bug #22923] option to prevent "interspersed" output in parallel builds

[Erik Cumps]

Follow-up Comment #4, bug #22923 (project make):

We have implemented output merging with a shell wrapper script. We ask make
to use this wrapper script via the SHELL variable.

The script itself is pretty simple, although it may be bash-centric:

----------------------------------------
#!/bin/sh

# Simple shell wrapper for stdout and stderr buffering
# Created 2002, Erik Cumps
#
# Use with parallel makes to prevent confusing output.
# Run make SHELL=makesh ... or edit makefile.
#
# This version merges stdout/stderr.

cleanup() {
        if [ -f /tmp/makesh-$$ ]; then
                cat /tmp/makesh-$$
                rm -f /tmp/makesh-$$
        fi
        if [ "${RC}" = "beach" ]; then
                # interrupted before reaping child status or weird error
                echo "*** makesh: interrupted by signal before reaping child
status" 1>&2
                exit 42
        else
                exit ${RC}
        fi
}

# Run command, redirect stdout/stderr to temp file
# Remember command's exit status
RC="beach"
trap cleanup SIGHUP SIGINT SIGQUIT SIGTERM
/bin/bash -c "$@" 1>/tmp/makesh-$$ 2>&1
RC=$?

cleanup
----------------------------------------


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