README revision 1.2.6.1
1 1.2.6.1 mrg $NetBSD: README,v 1.2.6.1 2009/12/14 06:20:58 mrg Exp $ 2 1.1 mrg 3 1.1 mrg 4 1.2.6.1 mrg Building multi- ABI libraries for NetBSD platforms. 5 1.1 mrg 6 1.1 mrg 7 1.2.6.1 mrg src/compat has a framework to (re)build the libraries shipped with 8 1.2.6.1 mrg NetBSD for a different ABI than the default for that platform. This 9 1.2.6.1 mrg allow 32-bit libraries for the amd64 and sparc64 ports, and enables 10 1.2.6.1 mrg the mips64 port to support all three of old-style 32-bit ("o32"), the 11 1.2.6.1 mrg new 32-bit (default, "n32", 64-bit CPU required) or the 64-bit ABI. 12 1.1 mrg 13 1.1 mrg 14 1.2.6.1 mrg The basic premise is to re-set $MAKEOBJDIRPREFIX to fresh subdirectory 15 1.2.6.1 mrg underneath src/compat and rebuild the libraries with a different set 16 1.2.6.1 mrg of options. Each platform wanting support should create their port 17 1.2.6.1 mrg subdirectory directly in src/compat, and then one subdirectory in here 18 1.2.6.1 mrg for each ABI required. e.g., src/compat/amd64/i386 is where we build 19 1.2.6.1 mrg the 32-bit compat libraries for the amd64port. In each of these 20 1.2.6.1 mrg subdirs, a small Makefile and makefile fragment should exist. The 21 1.2.6.1 mrg Makefile should set BSD_MK_COMPAT_FILE to equal the fragment, and then 22 1.2.6.1 mrg include "../../Makefile.common". Eg, amd64/i386/Makefile has: 23 1.1 mrg 24 1.2.6.1 mrg # $NetBSD: README,v 1.2.6.1 2009/12/14 06:20:58 mrg Exp $ 25 1.2.6.1 mrg 26 1.2.6.1 mrg BSD_MK_COMPAT_FILE=${.CURDIR}/bsd.i386.mk 27 1.2.6.1 mrg 28 1.2.6.1 mrg .include "../../Makefile.common" 29 1.2.6.1 mrg 30 1.2.6.1 mrg In the makefile fragment any changes to ABI flags are passed here 31 1.2.6.1 mrg and the MLIBDIR variable must be set to the subdirectory in /usr/lib 32 1.2.6.1 mrg where libraries for the ABI will be installed. There are a couple of 33 1.2.6.1 mrg helper Makefile's around. amd64/i386/bsd.i386.mk looks like: 34 1.2.6.1 mrg 35 1.2.6.1 mrg 36 1.2.6.1 mrg # $NetBSD: README,v 1.2.6.1 2009/12/14 06:20:58 mrg Exp $ 37 1.2.6.1 mrg 38 1.2.6.1 mrg LD+= -m elf_i386 39 1.2.6.1 mrg MLIBDIR= i386 40 1.2.6.1 mrg 41 1.2.6.1 mrg .include "${NETBSDSRCDIR}/compat/Makefile.m32" 42 1.2.6.1 mrg 43 1.2.6.1 mrg and the referenced Makefile.m32 looks like: 44 1.2.6.1 mrg 45 1.2.6.1 mrg # $NetBSD: README,v 1.2.6.1 2009/12/14 06:20:58 mrg Exp $ 46 1.2.6.1 mrg 47 1.2.6.1 mrg # 48 1.2.6.1 mrg # Makefile fragment to help implement a set of 'cc -m32' libraries. 49 1.2.6.1 mrg # 50 1.2.6.1 mrg 51 1.2.6.1 mrg COPTS+= -m32 52 1.2.6.1 mrg CPUFLAGS+= -m32 53 1.2.6.1 mrg LDADD+= -m32 54 1.2.6.1 mrg LDFLAGS+= -m32 55 1.2.6.1 mrg MKDEPFLAGS+= -m32 56 1.2.6.1 mrg 57 1.2.6.1 mrg .include "Makefile.compat" 58 1.2.6.1 mrg 59 1.2.6.1 mrg 60 1.2.6.1 mrg Makefile.common holds the list of subdirectories (the libraries and 61 1.2.6.1 mrg ld.elf_so) to build with this ABI. 62 1.2.6.1 mrg 63 1.2.6.1 mrg Makefile.md_subdir holds the list of subdirectories for each port. 64 1.2.6.1 mrg 65 1.2.6.1 mrg Makefile.compat has the basic framework to force the right paths for 66 1.2.6.1 mrg library and ld.elf_so linkage. It contains a hack to create subdirs 67 1.2.6.1 mrg in the build that should be fixed. 68 1.2.6.1 mrg 69 1.2.6.1 mrg dirshack/Makefile is a hack to get objdirs created timely, and should 70 1.2.6.1 mrg be fixed in a better way. 71 1.1 mrg 72 1.1 mrg 73 1.1 mrg TODO: 74 1.2.6.1 mrg 75 1.2.6.1 mrg - fix MLIBDIR in ld.elf_so arch-subdirs to be generic since it now is: 76 1.2.6.1 mrg .if defined(MLIBDIR) 77 1.2.6.1 mrg CPPFLAGS+= -DRTLD_ARCH_SUBDIR=\"${MLIBDIR}\" 78 1.2.6.1 mrg .endif 79 1.2.6.1 mrg - check this part in ld.elf_so Makefile. it may be right now: 80 1.2.6.1 mrg # XXXX this needs to find the right one some how yet. 81 1.2.6.1 mrg CLIBOBJ!= cd ${NETBSDSRCDIR}/lib/libc && ${PRINTOBJDIR} 82 1.2.6.1 mrg 83 1.2.6.1 mrg 84 1.2.6.1 mrg mrg (a] eterna.com.au 85 1.2.6.1 mrg december 2009 86
Indexes created Fri Oct 31 11:10:07 GMT 2025