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#!/bin/sh
# returns 0 on successful build or nothing to build
# non-zero exit status only on error during building
set -e # stop immediately on error
# [0-9]*.cc -> bootstrap.cc -> bootstrap_bin
# (layers) | |
# tangle $CXX
# can also be called with a layer to only build until
# $ ./build --until 050
UNTIL_LAYER=${2:-zzz}
# we use two mechanisms to speed up rebuilds:
# - older_than: run a command if the output is older than any of the inputs
# - update: if a command is quick to run, always run it but update the result only on any change
#
# avoid combining both mechanisms to generate a single file
# otherwise you'll see spurious messages about files being updated
# risk: a file may unnecessarily update without changes, causing unnecessary work downstream
test "$CXX" || export CXX=c++
test "$CC" || export CC=cc
test "$CFLAGS" || export CFLAGS="-g -O3 -std=c++98" # CI has an ancient version; don't expect recent dialects
export CFLAGS="$CFLAGS -Wall -Wextra -fno-strict-aliasing"
# return 1 if $1 is older than _any_ of the remaining args
older_than() {
local target=$1
shift
if [ ! -e $target ]
then
#? echo "$target doesn't exist"
echo "updating $target" >&2
return 0 # success
fi
local f
for f in $*
do
if [ $f -nt $target ]
then
echo "updating $target" >&2
return 0 # success
fi
done
return 1 # failure
}
# redirect to $1, unless it's already identical
update() {
if [ ! -e $1 ]
then
cat > $1
else
cat > $1.tmp
diff -q $1 $1.tmp >/dev/null && rm $1.tmp || mv $1.tmp $1
fi
}
update_cp() {
if [ ! -e $2/$1 ]
then
cp $1 $2
elif [ $1 -nt $2/$1 ]
then
cp $1 $2
fi
}
noisy_cd() {
cd $1
echo "-- `pwd`" >&2
}
older_than tools/enumerate tools/enumerate.cc && {
$CXX $CFLAGS tools/enumerate.cc -o tools/enumerate
}
older_than tools/tangle tools/tangle.cc && {
noisy_cd tools
grep -h "^[^ #].*) {" tangle.cc |sed 's/ {.*/;/' |update tangle.function_list
grep -h "^[[:space:]]*void test_" tangle.cc |sed 's/^\s*void \(.*\)() {$/\1,/' |update tangle.test_list
grep -h "^\s*void test_" tangle.cc |sed 's/^\s*void \(.*\)() {.*/"\1",/' |update tangle.test_name_list
$CXX $CFLAGS tangle.cc -o tangle
./tangle test
noisy_cd .. # no effect; just to show us returning to the parent directory
}
LAYERS=$(tools/enumerate --until $UNTIL_LAYER |grep '.cc$')
older_than bootstrap.cc $LAYERS tools/enumerate tools/tangle && {
# no update here; rely on 'update' calls downstream
tools/tangle $LAYERS > bootstrap.cc
}
grep -h "^[^[:space:]#].*) {$" bootstrap.cc |grep -v ":.*(" |sed 's/ {.*/;/' |update function_list
grep -h "^\s*void test_" bootstrap.cc |sed 's/^\s*void \(.*\)() {.*/\1,/' |update test_list
grep -h "^\s*void test_" bootstrap.cc |sed 's/^\s*void \(.*\)() {.*/"\1",/' |update test_name_list
older_than bootstrap_bin bootstrap.cc *_list && {
$CXX $CFLAGS bootstrap.cc -o bootstrap_bin
echo
}
exit 0
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