README revision 1.2.2.1
1 1.2.2.1 riz $NetBSD: README,v 1.2.2.1 2011/01/06 05:19:55 riz Exp $ 2 1.1 mrg 3 1.1 mrg 4 1.2.2.1 riz Building multi- ABI libraries for NetBSD platforms. 5 1.1 mrg 6 1.1 mrg 7 1.2.2.1 riz src/compat has a framework to (re)build the libraries shipped with 8 1.2.2.1 riz NetBSD for a different ABI than the default for that platform. This 9 1.2.2.1 riz allows 32-bit libraries for the amd64 and sparc64 ports, and enables 10 1.2.2.1 riz the mips64 port to support all three of old-style 32-bit ("o32"), the 11 1.2.2.1 riz new 32-bit (default, "n32", 64-bit CPU required) or the 64-bit ABI. 12 1.1 mrg 13 1.1 mrg 14 1.2.2.1 riz The basic premise is to re-set $MAKEOBJDIRPREFIX to fresh subdirectory 15 1.2.2.1 riz underneath src/compat and rebuild the libraries with a different set 16 1.2.2.1 riz of options. Each platform wanting support should create their port 17 1.2.2.1 riz subdirectory directly in src/compat, and then one subdirectory in here 18 1.2.2.1 riz for each ABI required. e.g., src/compat/amd64/i386 is where we build 19 1.2.2.1 riz the 32-bit compat libraries for the amd64 port. In each of these 20 1.2.2.1 riz subdirs, a small Makefile and makefile fragment should exist. The 21 1.2.2.1 riz Makefile should set BSD_MK_COMPAT_FILE to equal the fragment, and then 22 1.2.2.1 riz include "../../compatsubdir.mk" Eg, amd64/i386/Makefile has: 23 1.1 mrg 24 1.2.2.1 riz BSD_MK_COMPAT_FILE=${.CURDIR}/bsd.i386.mk 25 1.1 mrg 26 1.2.2.1 riz .include "../../compatsubdir.mk" 27 1.1 mrg 28 1.2.2.1 riz In the makefile fragment any changes to ABI flags are passed here 29 1.2.2.1 riz and the MLIBDIR variable must be set to the subdirectory in /usr/lib 30 1.2.2.1 riz where libraries for the ABI will be installed. There are a couple of 31 1.2.2.1 riz helper Makefiles around. amd64/i386/bsd.i386.mk looks like: 32 1.1 mrg 33 1.2.2.1 riz LD+= -m elf_i386 34 1.2.2.1 riz MLIBDIR= i386 35 1.2.2.1 riz LIBC_MACHINE_ARCH= ${MLIBDIR} 36 1.2.2.1 riz COMMON_MACHINE_ARCH= ${MLIBDIR} 37 1.2.2.1 riz KVM_MACHINE_ARCH= ${MLIBDIR} 38 1.2.2.1 riz PTHREAD_MACHINE_ARCH= ${MLIBDIR} 39 1.2.2.1 riz BFD_MACHINE_ARCH= ${MLIBDIR} 40 1.2.2.1 riz CSU_MACHINE_ARCH= ${MLIBDIR} 41 1.2.2.1 riz CRYPTO_MACHINE_CPU= ${MLIBDIR} 42 1.2.2.1 riz LDELFSO_MACHINE_CPU= ${MLIBDIR} 43 1.1 mrg 44 1.2.2.1 riz .include "${NETBSDSRCDIR}/compat/m32.mk" 45 1.2.2.1 riz 46 1.2.2.1 riz and the referenced m32.mk looks like: 47 1.2.2.1 riz 48 1.2.2.1 riz COPTS+= -m32 49 1.2.2.1 riz CPUFLAGS+= -m32 50 1.2.2.1 riz LDADD+= -m32 51 1.2.2.1 riz LDFLAGS+= -m32 52 1.2.2.1 riz MKDEPFLAGS+= -m32 53 1.2.2.1 riz 54 1.2.2.1 riz .include "Makefile.compat" 55 1.2.2.1 riz 56 1.2.2.1 riz 57 1.2.2.1 riz compatsubdir.mk holds the list of subdirectories (the libraries and 58 1.2.2.1 riz ld.elf_so) to build with this ABI. 59 1.2.2.1 riz 60 1.2.2.1 riz archdirs.mk holds the list of subdirectories for each port. 61 1.2.2.1 riz 62 1.2.2.1 riz Makefile.compat has the basic framework to force the right paths for 63 1.2.2.1 riz library and ld.elf_so linkage. It contains a hack to create subdirs 64 1.2.2.1 riz in the build that should be fixed. 65 1.2.2.1 riz 66 1.2.2.1 riz dirshack/Makefile is a hack to get objdirs created timely, and should 67 1.2.2.1 riz be fixed in a better way. 68 1.2.2.1 riz 69 1.2.2.1 riz 70 1.2.2.1 riz 71 1.2.2.1 riz mrg (a] eterna.com.au 72 1.2.2.1 riz december 2009 73
Indexes created Sun Nov 02 23:10:09 GMT 2025