hush/scripts/gen_build_files.sh
Alexander Shishkin daf286cda5 Fix out-of-tree build's recursion
While doing O=build build I've noticed that it was getting gradually
slower with each invocation. The reason turned out to be that the build
directory was inside the source tree and got recreated inside itself
with all its subdirectories.

This patch changes the behavior so that only the directories with
Kbuild.src or Config.src in them are created in the out-of-tree build
directory. A quick rebuild from scratch revealed no problems with this.

Signed-off-by: Alexander Shishkin <virtuoso@slind.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-07-18 23:57:49 +02:00

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#!/bin/sh
test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
# cd to objtree
cd -- "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
# In separate objtree build, include/ might not exist yet
mkdir include 2>/dev/null
srctree="$1"
# (Re)generate include/applets.h
src="$srctree/include/applets.src.h"
dst="include/applets.h"
s=`sed -n 's@^//applet:@@p' -- "$srctree"/*/*.c "$srctree"/*/*/*.c`
old=`cat "$dst" 2>/dev/null`
# Why "IFS='' read -r REPLY"??
# This atrocity is needed to read lines without mangling.
# IFS='' prevents whitespace trimming,
# -r suppresses backslash handling.
new=`echo "/* DO NOT EDIT. This file is generated from applets.src.h */"
while IFS='' read -r REPLY; do
test x"$REPLY" = x"INSERT" && REPLY="$s"
printf "%s\n" "$REPLY"
done <"$src"`
if test x"$new" != x"$old"; then
echo " GEN $dst"
printf "%s\n" "$new" >"$dst"
fi
# (Re)generate include/usage.h
src="$srctree/include/usage.src.h"
dst="include/usage.h"
# We add line continuation backslash after each line,
# and insert empty line before each line which doesn't start
# with space or tab
# (note: we need to use \\\\ because of ``)
s=`sed -n -e 's@^//usage:\([ \t].*\)$@\1 \\\\@p' -e 's@^//usage:\([^ \t].*\)$@\n\1 \\\\@p' -- "$srctree"/*/*.c "$srctree"/*/*/*.c`
old=`cat "$dst" 2>/dev/null`
new=`echo "/* DO NOT EDIT. This file is generated from usage.src.h */"
while IFS='' read -r REPLY; do
test x"$REPLY" = x"INSERT" && REPLY="$s"
printf "%s\n" "$REPLY"
done <"$src"`
if test x"$new" != x"$old"; then
echo " GEN $dst"
printf "%s\n" "$new" >"$dst"
fi
# (Re)generate */Kbuild and */Config.in
{ cd -- "$srctree" && find -type d; } | while read -r d; do
d="${d#./}"
src="$srctree/$d/Kbuild.src"
dst="$d/Kbuild"
if test -f "$src"; then
mkdir -p -- "$d" 2>/dev/null
#echo " CHK $dst"
s=`sed -n 's@^//kbuild:@@p' -- "$srctree/$d"/*.c`
old=`cat "$dst" 2>/dev/null`
new=`echo "# DO NOT EDIT. This file is generated from Kbuild.src"
while IFS='' read -r REPLY; do
test x"$REPLY" = x"INSERT" && REPLY="$s"
printf "%s\n" "$REPLY"
done <"$src"`
if test x"$new" != x"$old"; then
echo " GEN $dst"
printf "%s\n" "$new" >"$dst"
fi
fi
src="$srctree/$d/Config.src"
dst="$d/Config.in"
if test -f "$src"; then
mkdir -p -- "$d" 2>/dev/null
#echo " CHK $dst"
s=`sed -n 's@^//config:@@p' -- "$srctree/$d"/*.c`
old=`cat "$dst" 2>/dev/null`
new=`echo "# DO NOT EDIT. This file is generated from Config.src"
while IFS='' read -r REPLY; do
test x"$REPLY" = x"INSERT" && REPLY="$s"
printf "%s\n" "$REPLY"
done <"$src"`
if test x"$new" != x"$old"; then
echo " GEN $dst"
printf "%s\n" "$new" >"$dst"
fi
fi
done
# Last read failed. This is normal. Don't exit with its error code:
exit 0