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Welcome to ftp.nluug.nl Current directory: /os/NetBSD/NetBSD-current/src/compat/ |
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Contents of README:$NetBSD: README,v 1.9 2024/02/04 05:43:05 mrg 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@eterna23.net december 2009 |
Name Last modified Size
Parent Directory -
CVS/ 16-Aug-2024 05:01 -
amd64/ 25-Dec-2009 07:25 -
arm/ 16-Aug-2024 05:01 -
dirshack/ 14-May-2023 05:00 -
mips64/ 26-Apr-2021 05:00 -
powerpc64/ 08-Mar-2014 04:01 -
riscv64/ 20-Sep-2014 05:03 -
sparc64/ 25-Dec-2009 07:25 -
Makefile 30-May-2022 05:00 288
Makefile.compat 24-Aug-2012 05:01 852
README 05-Feb-2024 04:00 2.3K
archdirs.mk 08-Jun-2021 05:00 773
compatsubdir.mk 25-Jul-2015 05:27 1.0K
exec.mk 14-May-2023 05:00 1.4K
m32.mk 18-Jun-2011 05:01 313
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