1#!/bin/bash 2 3# Regenerate scripts/prereq (hopefully) portable build. 4 5# Detect toybox prerequisites using record-commands 6 7mkroot/record-commands make clean defconfig toybox 8sed -i 's/default y/default n/' generated/Config.probed 9CMDLIST="$(echo toybox; ./toybox cut -DF 1 log.txt | sort -u | grep -v nproc)" 10{ 11 for i in $(tr '[:lower:]' '[:upper:]' <<<"$CMDLIST") 12 do 13 grep -qi CONFIG_$i'[= ]' .config && echo CONFIG_$i=y 14 done 15} > prereq.mini 16 17# Create minimal dependency-free build 18 19make clean allnoconfig KCONFIG_ALLCONFIG=prereq.mini 20make toybox 21cat > scripts/prereq/build.sh << 'EOF' 22#!/bin/sh 23 24BUILD='cc -funsigned-char -I scripts/prereq -I . -Os -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-strict-aliasing -DTOYBOX_VERSION=""' 25LINK='' 26EOF 27grep -A999 FILES= generated/build.sh >> scripts/prereq/build.sh 28sed -i 's/ toybox$/&-prereq/' scripts/prereq/build.sh 29 30# harvest stripped down headers 31 32echo > scripts/prereq/generated/tags.h 33sed 's/.*/#define HELP_& ""/' <<<"$CMDLIST" > scripts/prereq/generated/help.h 34egrep "($(xargs <<<"$CMDLIST"|tr ' [:lower:]' '|[:upper:]'))" \ 35 generated/newtoys.h > scripts/prereq/generated/newtoys.h 36FORS="$(sed -n 's/#define FOR_//p' $(grep -o 'toys/[^/]*/[^.]*\.c' scripts/prereq/build.sh) | xargs | tr ' ' '|')" 37sed -En '1,/^$/p;/\/\/ ('"$FORS"') /,/^$/p;/#ifdef FOR_('"$FORS"')$/,/^$/p' generated/flags.h > scripts/prereq/generated/flags.h 38egrep "OPTSTR_($(egrep -v "($FORS)" <<<"$CMDLIST" | xargs | tr ' ' '|'))" \ 39 generated/flags.h >> scripts/prereq/generated/flags.h 40# TODO: slim down config.h 41cp generated/{globals,config}.h scripts/prereq/generated/ 42