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| 1 | $NetBSD: README,v 1.3 2009/01/13 17:52:32 jmmv Exp $ | | 1 | $NetBSD: README,v 1.4 2009/12/13 09:27:57 mrg Exp $ |
| 2 | | | 2 | |
| 3 | This directory contains Makefile fragments that will build all of the | | | |
| 4 | NetBSD libraries in 32-bit mode and install them into /usr/lib/<arch> | | | |
| 5 | and also install a /usr/libexec/ld.elf_so-<arch>. | | | |
| 6 | | | 3 | |
| 7 | This is current only supported for the amd64 and sparc64 platforms, | | 4 | Building multi- ABI libraries for NetBSD platforms. |
| 8 | where <arch> is "i386" or "sparc" respectively. (It could be used to | | | |
| 9 | build MIPS o32 libraries on n32 system, but not both n32 and o32 on | | | |
| 10 | a n64 system. It only supports one extra target.) | | | |
| 11 | | | 5 | |
| 12 | | | 6 | |
| 13 | Most of the makefiles here were built with the "build-makefiles" script. | | 7 | src/compat has a framework to (re)build the libraries shipped with |
| 14 | The exceptions are lib/csu/Makefile and ld.elf_so/Makefile. | | 8 | NetBSD for a different ABI than the default for that platform. This |
| | | 9 | allow 32-bit libraries for the amd64 and sparc64 ports, and enables |
| | | 10 | the mips64 port to support all three of old-style 32-bit ("o32"), the |
| | | 11 | new 32-bit (default, "n32", 64-bit CPU required) or the 64-bit ABI. |
| 15 | | | 12 | |
| 16 | | | 13 | |
| 17 | The method used is the: | | 14 | The basic premise is to re-set $MAKEOBJDIRPREFIX to fresh subdirectory |
| 18 | - evaluate some local variables | | 15 | underneath src/compat and rebuild the libraries with a different set |
| 19 | - switch .CURDIR | | 16 | of options. Each platform wanting support should create their port |
| 20 | - include original Makefile, | | 17 | subdirectory directly in src/compat, and then one subdirectory in here |
| 21 | - evaluate some variables | | 18 | for each ABI required. e.g., src/compat/amd64/i386 is where we build |
| 22 | - switch .CURDIR back | | 19 | the 32-bit compat libraries for the amd64port. In each of these |
| 23 | that is used by crunchgen to build eg, installer media or /rescue. | | 20 | subdirs, a small Makefile and makefile fragment should exist. The |
| | | 21 | Makefile should set BSD_MK_COMPAT_FILE to equal the fragment, and then |
| | | 22 | include "../../Makefile.common". Eg, amd64/i386/Makefile has: |
| 24 | | | 23 | |
| | | 24 | BSD_MK_COMPAT_FILE=${.CURDIR}/bsd.i386.mk |
| 25 | | | 25 | |
| | | 26 | .include "../../Makefile.common" |
| 26 | | | 27 | |
| 27 | TODO: | | 28 | In the makefile fragment any changes to ABI flags are passed here |
| 28 | - some yacc issue -- libc, libipsec and libpcap need "make" run | | 29 | and the MLIBDIR variable must be set to the subdirectory in /usr/lib |
| 29 | to generate headers properly, otherwise it complains about | | 30 | where libraries for the ABI will be installed. There are a couple of |
| 30 | no way to get to foo.h. this is currently hacked by putting | | 31 | helper Makefile's around. amd64/i386/bsd.i386.mk looks like: |
| 31 | a rule "foo.h: foo.c" in the (generated) makefiles | | | |
| 32 | - there's an ugly hack to make libpam build correctly again the | | | |
| 33 | right libc. ld.elf_so has a similar (but less ugly hack) | | | |
| 34 | - not sure that /usr/lib/{i386,sparc}{,/i18n} are created | | | |
| 35 | properly yet | | | |
| 36 | | | 32 | |
| 37 | Future work | | 33 | LD+= -m elf_i386 |
| | | 34 | MLIBDIR= i386 |
| | | 35 | LIBC_MACHINE_ARCH= ${MLIBDIR} |
| | | 36 | COMMON_MACHINE_ARCH= ${MLIBDIR} |
| | | 37 | KVM_MACHINE_ARCH= ${MLIBDIR} |
| | | 38 | PTHREAD_MACHINE_ARCH= ${MLIBDIR} |
| | | 39 | BFD_MACHINE_ARCH= ${MLIBDIR} |
| | | 40 | CSU_MACHINE_ARCH= ${MLIBDIR} |
| | | 41 | CRYPTO_MACHINE_CPU= ${MLIBDIR} |
| | | 42 | LDELFSO_MACHINE_CPU= ${MLIBDIR} |
| 38 | | | 43 | |
| 39 | Ideally this should be able to handle any number of compat targets. | | 44 | .include "${NETBSDSRCDIR}/compat/Makefile.m32" |
| 40 | Perhaps using a "force MAKEOBJDIR, and run-run make" solution will | | 45 | |
| 41 | work, but my initial attempts got me no where. If not, perhaps | | 46 | and the referenced Makefile.m32 looks like: |
| 42 | build-makefiles could be expanded to be used at run-time in such | | 47 | |
| 43 | a per-compat target obj-dir. | | 48 | COPTS+= -m32 |
| | | 49 | CPUFLAGS+= -m32 |
| | | 50 | LDADD+= -m32 |
| | | 51 | LDFLAGS+= -m32 |
| | | 52 | MKDEPFLAGS+= -m32 |
| | | 53 | |
| | | 54 | .include "Makefile.compat" |
| | | 55 | |
| | | 56 | |
| | | 57 | Makefile.common holds the list of subdirectories (the libraries and |
| | | 58 | ld.elf_so) to build with this ABI. |
| | | 59 | |
| | | 60 | Makefile.md_subdir holds the list of subdirectories for each port. |
| | | 61 | |
| | | 62 | Makefile.compat has the basic framework to force the right paths for |
| | | 63 | library and ld.elf_so linkage. It contains a hack to create subdirs |
| | | 64 | in the build that should be fixed. |
| | | 65 | |
| | | 66 | dirshack/Makefile is a hack to get objdirs created timely, and should |
| | | 67 | be fixed in a better way. |
| | | 68 | |
| | | 69 | |
| | | 70 | |
| | | 71 | mrg@eterna.com.au |
| | | 72 | december 2009 |