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NetBSD/compat
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christos 1075ff19ce define BFD_MACHINE_ARCH. This worked by accident before since the default 
64 bit target was 32 bits.
2021-04-25 18:44:04 +00:00
..
amd64/i386 add LIBGCC_MACHINE_ARCH 2016-10-22 20:33:51 +00:00
arm 1. All Makefiles that use ARM_APCS_FLAGS add -marm unconditionally and 2019-10-24 18:46:20 +00:00
dirshack Implement build_install in src/lib/Makefile, which traverses the 2012-08-17 16:22:27 +00:00
mips64 define BFD_MACHINE_ARCH. This worked by accident before since the default 2021-04-25 18:44:04 +00:00
powerpc64/powerpc Support building the xorg X11 libraries under MKCOMPAT. 2015-06-24 22:20:24 +00:00
riscv64/rv32 - various updates for GCC 7 riscv definitions: -mabi and -march changed 2019-04-18 10:07:07 +00:00
sparc64/sparc Support building the xorg X11 libraries under MKCOMPAT. 2015-06-24 22:20:24 +00:00
archdirs.mk mips64 -> o32 64 2021-04-25 15:18:23 +00:00
compatsubdir.mk remove the xfree86 reachover makefiles and the vast majority of 2015-07-23 08:03:24 +00:00
exec.mk Use the compat machinery to build "native" IPF binaries as ipfilter 2021-01-05 11:07:59 +00:00
m32.mk avoid adding -m32 to various variables multiple times aka, multiple inclusions. 2011-06-18 01:22:34 +00:00
Makefile Implement build_install in src/lib/Makefile, which traverses the 2012-08-17 16:22:27 +00:00
Makefile.compat Revert last, it breaks the tricks xsrc uses. 2012-08-23 21:21:14 +00:00
README Fix typos; wording. 2012-03-29 18:35:11 +00:00

README 

$NetBSD: README,v 1.8 2012/03/29 18:35:11 wiz Exp $


Building multi-ABI libraries for NetBSD platforms.


src/compat has a framework to (re)build the libraries shipped with
NetBSD for a different ABI than the default for that platform.  This
allows 32-bit libraries for the amd64 and sparc64 ports, and enables
the mips64 port to support all three of old-style 32-bit ("o32"), the
new 32-bit (default, "n32", 64-bit CPU required) or the 64-bit ABI.


The basic premise is to re-set $MAKEOBJDIR to fresh subdirectory
underneath src/compat and rebuild the libraries with a different set
of options.  Each platform wanting support should create their port
subdirectory directly in src/compat, and then one subdirectory in here
for each ABI required, e.g., src/compat/amd64/i386 is where we build
the 32-bit compat libraries for the amd64 port.  In each of these
subdirectories, a small Makefile and makefile fragment should exist.  The
Makefile should set BSD_MK_COMPAT_FILE to equal the fragment, and then
include "../../compatsubdir.mk".  E.g., amd64/i386/Makefile has:

	BSD_MK_COMPAT_FILE=${.CURDIR}/bsd.i386.mk

	.include "../../compatsubdir.mk"

In the makefile fragment any changes to ABI flags are passed here
and the MLIBDIR variable must be set to the subdirectory in /usr/lib
where libraries for the ABI will be installed.  There are a couple of
helper Makefiles around.  amd64/i386/bsd.i386.mk looks like:

	LD+=			-m elf_i386
	MLIBDIR=		i386
	LIBC_MACHINE_ARCH=	${MLIBDIR}
	COMMON_MACHINE_ARCH=	${MLIBDIR}
	KVM_MACHINE_ARCH=	${MLIBDIR}
	PTHREAD_MACHINE_ARCH=	${MLIBDIR}
	BFD_MACHINE_ARCH=	${MLIBDIR}
	CSU_MACHINE_ARCH=	${MLIBDIR}
	CRYPTO_MACHINE_CPU=	${MLIBDIR}
	LDELFSO_MACHINE_CPU=	${MLIBDIR}

	.include "${NETBSDSRCDIR}/compat/m32.mk"

and the referenced m32.mk looks like:

	COPTS+=			-m32
	CPUFLAGS+=		-m32
	LDADD+=			-m32
	LDFLAGS+=		-m32
	MKDEPFLAGS+=		-m32

	.include "Makefile.compat"


compatsubdir.mk holds the list of subdirectories (the libraries and
ld.elf_so) to build with this ABI.

archdirs.mk holds the list of subdirectories for each port.

Makefile.compat has the basic framework to force the right paths for
library and ld.elf_so linkage.  It contains a hack to create subdirectories
in the build that should be fixed.

dirshack/Makefile is a hack to get objdirs created timely, and should
be fixed in a better way.



mrg@eterna.com.au
december 2009