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Diffstat (limited to 'bootstrap/bmake/README')
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diff --git a/bootstrap/bmake/README b/bootstrap/bmake/README new file mode 100644 index 00000000000..005c3228e08 --- /dev/null +++ b/bootstrap/bmake/README @@ -0,0 +1,110 @@ + bmake v3 + +This directory contains a port of the BSD make tool (from NetBSD) +I have run it on SunOS,Solaris,HP-UX 9 and IRIX. + +Version 3 is has been re-worked from scratch to better facilitate +importing newer make(1) versions from NetBSD. The original code base +was NetBSD-1.0, so version 3 was built by doing a fresh import of the +NetBSD-1.0 usr.bin/make, adding the autoconf and other portability +patches to sync it with bmake v2, and then NetBSD's make +of Feb 20, 2000 was imported and conflicts dealt with. +NetBSD's make was again imported on June 6 and December 15, 2000. + +Note: when cvs importing newer versions +it is important to (in usr.bin/make): + +mv config.h make-conf.h +mv Makefile Makefile.in + +before running cvs import. + +Building is simply a matter of: + +configure +make -f makefile.boot +make -f makefile.boot install +make -f makefile.boot install-man +make -f makefile.boot install-mk + +The install-mk target is only useful if you unpacked [bsd-]mk.tar.gz +under the bmake directory. + +if you have GNU make or a make which supports VPATH, you can build it +in a separate directory: + +here=`pwd` +mkdir /tmp/bmake +cd /tmp/bmake +$here/configure +gmake -f makefile.boot +gmake -f makefile.boot install +gmake -f makefile.boot install-man +gmake -f makefile.boot install-mk + +To make much use of bmake you will need the bsd.*.mk macros or my +portable *.mk macros. See +ftp://ftp.quick.com.au/pub/sjg/bsd-mk.tar.gz +ftp://ftp.quick.com.au/pub/sjg/mk.tar.gz + +If you have an earlier version of bmake installed you can use that +with the generated Makefile. + +Apart from new features such as .PARSEDIR picked up from the recent +NetBSD make, this version has improvments (which are also in NetBSD's +make or soon will be) to facilitate using MAKEOBJDIRPREFIX to support +true read-only src trees. See also ChangeLog. + +MAKEOBJDIRPREFIX: + +When MAKEOBJDIRPREFIX is set in the environment make(1) will attempt +to chdir(${MAKEOBJDIRPREFIX}${.CUDRIR}) and use that as its objdir. +Because the directory tree under ${MAKEOBJDIRPREFIX} is a mirror of +the src tree, make ends up chdir'ing to objdirs that would not exist +otherwise. That is, when using normal ./obj dirs (or symlinks) only +Makefiles which include obj.mk get a separate objdir. When using +MAKEOBJDIRPREFIX any directory which has subdirs that use obj.mk will +have an objdir, thus Makefiles which were written expecting to process +in ${.CURDIR} may break. In particular, Makefiles which do: + +build: + ${.MAKE} something + ${.MAKE} else + +will break as the sub-make will not find a Makefile in +${MAKEOBJDIRPREFIX}${.CUDRIR}. Whereas + +build: + cd ${.CURDIR} && ${.MAKE} something + cd ${.CURDIR} && ${.MAKE} else + +will work fine. To avoid the need to re-work these Makefiles we +check for running ${.MAKE} or ${.MAKE:T} without a preceeding cd and +effectively insert one. This feature only operates if +MAKEOBJDIRPREFIX (or MAKEOBJDIR) is set and can be dissabled by +defining NOCHECKMAKECHDIR. + +Another problem arrises from make(1) overriding the physical location +returned by getcwd() with the logical one from $PWD. We dissable this +feature if MAKEOBJDIRPREFIX is set to avoid the situation where +make(1) behaves differently depending on how it got to a directory. +This avoids lossage like the following example. + +If /usr/local/src is a symlink to /d3/src: + +cd /usr/local/src/project +MAKEOBJDIRPREFIX=/tmp/obj make obj +===> sub1 +/d3/src/project/sub1 -> /tmp/obj/d3/src/project/sub1 +... + +cd /usr/local/src/project/sub1 +MAKEOBJDIRPREFIX=/tmp/obj make obj +/usr/local/src/project/sub1 -> /tmp/obj/usr/local/src/project/sub1 + +the expected objdir changes depending on circumstances - which +means that 9 times out of 10 you'll end up trying to polute +curdir because the objdir you expected does not exist. + + +--sjg |