Quick hack to make fast kernel builds easier

[M. Warner Losh]

In message: <20090111191251.GA74450 at zim.MIT.EDU>
            David Schultz <das at FreeBSD.ORG> writes:
: On Sun, Jan 11, 2009, Ed Schouten wrote:
: > I often just run `make' in /usr/obj/...,
: > which also saves some typing, but unfortunately that doesn't work when
: > cross compiling.
: 
: Also, as far as I know, there's no convenient way to rebuild a
: single module for another architecture. I use the following script
: called 'arch' to set the appropriate environment variables, so if
: I've already run 'make universe' and I want to rebuild libc for
: sparc64, I say:
: 
:    cd /usr/src/lib/libc && arch sparc64 make
: 
: It would be nice if there were a better mechanism for this that's
: integrated into the build system.

I do one of the following:

(1) env TARGET=arm make buildworld -DNO_CLEAN

or

(2) env TARGET=arm make buildenv
$ cd lib/libc && make

These both work out well enough in practice for me.  I've wanted a
target that was 'reworld' that just did an 'all' and maybe a few other
things, but I've never had the time to polish this up (had it in a
couple of trees that I lost due to disk failure).

I do agree it would be nice if there was some way to do 'all' for a
subdirectory with a 'trust me, I know what I'm doing, so don't do all
that other stuff' flag.

Warner

: #!/bin/sh
: 
: arch=$1
: basepath=/usr/src
: 
: export __MAKE_CONF=/dev/null
: export MAKEOBJDIRPREFIX=/usr/obj/${arch}
: export MACHINE_ARCH=${arch}
: export MACHINE=${arch}
: export CPUTYPE=
: export GROFF_BIN_PATH=/usr/obj/${arch}${basepath}/tmp/legacy/usr/bin
: export GROFF_FONT_PATH=/usr/obj/${arch}${basepath}/tmp/legacy/usr/share/groff_font
: export GROFF_TMAC_PATH=/usr/obj/${arch}${basepath}/tmp/legacy/usr/share/tmac
: export _SHLIBDIRPREFIX=/usr/obj/${arch}${basepath}/tmp
: export INSTALL="sh /usr/src/tools/install.sh"
: export PATH=/usr/obj/${arch}${basepath}/tmp/legacy/usr/sbin:/usr/obj/${arch}${basepath}/tmp/legacy/usr/bin:/usr/obj/${arch}${basepath}/legacy/usr/games:/usr/obj/${arch}${basepath}/tmp/usr/sbin:/usr/obj/${arch}${basepath}/tmp/usr/bin:/usr/obj/${arch}${basepath}/tmp/usr/games:/sbin:/bin:/usr/sbin:/usr/bin
: DESTDIR=/usr/obj/${arch}${basepath}/tmp
: 
: shift
: $*
: 
: