1$NetBSD: README,v 1.9 2021/07/12 07:59:51 mrg Exp $ 2 3GMP in NetBSD. We need GMP for GCC >= 4.2. 4 5 6Building GMP without configure - how to port GMP build to a new platform. 7 8The GMP build doesn't map very well to normal make. The ./configure phase 9creates a bunch of symlinks and weeds out the sources lists, and there are 10files with the same name in different subdirectories linked into the same 11final product. All of these issues need to be dealt with. 12 13There is a mostly-working "mknative" for GMP now. If this fails, see the 14section below for the old instructions. 15 16 - run a "./build tools libs", possibly setting MKGCC=no if the 17 GMP port is currently not working at all. 18 19 - cd to tools/gmp, and run $TOOLDIR/bin/nbmake-$arch native-gmp 20 21 - if that works, commit the files it changed in the source tree. 22 23 - set NEWCONFIGDIR=/writeable/src if eg /usr/src is read-only. 24 25These are the old steps, that maybe are necessary to fix the automated 26output: 27 28 - run ./configure, save the output. you can use the makefile 29 "Makefile.netbsd-gmp" in this directory to run this with the 30 right options, etc. run it with nbmake-$MACHINE. 31 32 - create src/external/gpl3/gmp/lib/libgmp/arch/${MACHINE_ARCH} dir, 33 and copy these files into it: 34 config.h 35 config.m4 36 gmp-mparam.h 37 gmp.h 38 39 some of these files might have src/obj references. in particular 40 fix GMP_MPARAM_H_SUGGEST to start from ./mpn/... and make sure 41 we #define __GMP_CC to just "gcc", and make sure that 42 CONFIG_TOP_SRCDIR is not defined in config.m4 43 44 the "Makefile.netbsd-gmp" has a "copy-files" target that performs 45 these tasks. 46 47 - parse the ./configure output and note all created symlinks 48 for mpn. these need to be converted into a new Makefile.inc. 49 there is a script in this subdir build-gmp-Makefile.inc.awk 50 that can be used to do this. it should just work to generate 51 the first section of Makefile.inc if fed the entire configure 52 output. 53 54 assembler files generally want -DOPERATION_${foo} defined for 55 each way they are compiled or pre-processed. the pre-processor 56 used is m4 to parse, and we and create .s files from the .asm 57 files that we then we feed into $CC. 58 59 this part needs to be automated, but requires that the first 60 part's ./configure output be stored for it. this is not done. 61 62 it would be good to convert the Makefile.inc into a pair of 63 files -- srcs.mk generated from build-gmp-Makefile.inc.awk, and 64 the remaining static part of the Makefile.inc left with the 65 include of srcs.mk. 66 67The amd64 port is a good reference to compare. 68 69 70mrg@netbsd.org 71- 2021/07/11 72