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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 -> mu.cc -> .build/*.cc -> .build/*.o -> .build/mu_bin
# (layers) | | | |
# tangle cleave $CXX $CXX
# can also be called with a layer to only build until
# $ ./build --until 050
UNTIL_LAYER=${2:-zzz}
# there's two mechanisms for fast builds here:
# - if a command is quick to run, always run it but update the result only on any change
# - otherwise run it only if the output is 'older_than' the inputs
#
# avoid combining both mechanisms for 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 $CFLAGS || export CFLAGS="-g -O3"
export CFLAGS="$CFLAGS -Wall -Wextra -ftrapv -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 enumerate/enumerate enumerate/enumerate.cc && {
$CXX $CFLAGS enumerate/enumerate.cc -o enumerate/enumerate
}
(
older_than tangle/tangle tangle/*.cc && {
noisy_cd tangle
{
grep -h "^struct .* {" [0-9]*.cc |sed 's/\(struct *[^ ]*\).*/\1;/'
grep -h "^typedef " [0-9]*.cc
} |update type_list
grep -h "^[^ #].*) {" [0-9]*.cc |sed 's/ {.*/;/' |update function_list
ls [0-9]*.cc |grep -v "\.test\.cc$" |sed 's/.*/#include "&"/' |update file_list
ls [0-9]*.test.cc |sed 's/.*/#include "&"/' |update test_file_list
grep -h "^[[:space:]]*void test_" [0-9]*.cc |sed 's/^\s*void \(.*\)() {$/\1,/' |update test_list
$CXX $CFLAGS boot.cc -o tangle
noisy_cd .. # no effect; just to show us returning to the parent directory
}
exit 0
)
LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER |grep -v '.mu$')
older_than mu.cc $LAYERS enumerate/enumerate tangle/tangle && {
# exception to the rules above: we combine 'older_than' and 'update' here
# because we sometimes want to hack directly on mu.cc and not lose our
# changes if they're newer.
# shorter version but continues unnecessarily if tangle dies
# ./tangle/tangle $LAYERS |update mu.cc
./tangle/tangle $LAYERS > mu_tmp.cc # die if this fails
cat mu_tmp.cc |update mu.cc
rm mu_tmp.cc
}
older_than cleave/cleave cleave/cleave.cc && {
$CXX -O3 -Wall -Wextra -fno-strict-aliasing cleave/cleave.cc -o cleave/cleave
rm -rf .build
}
mkdir -p .build
grep -h "^[^[:space:]#].*) {$" mu.cc |grep -v ":.*(" |sed 's/ {.*/;/' |update .build/function_list
grep -h "^\s*void test_" mu.cc |sed 's/^\s*void \(.*\)() {.*/\1,/' |update .build/test_list
mkdir -p .build/termbox
update_cp termbox/termbox.h .build/termbox
older_than mu_bin mu.cc *_list cleave/cleave termbox/* && {
./cleave/cleave mu.cc .build
noisy_cd .build
grep ';' global_definitions_list |sed 's/[=(].*/;/' |sed 's/^[^\/# ]/extern &/' |sed 's/^extern extern /extern /' |update global_declarations_list
for f in mu_*.cc
do
older_than `echo $f |sed 's/\.cc$/.o/'` $f header global_declarations_list function_list test_list && {
$CXX $CFLAGS -c $f
}
done
noisy_cd ../termbox
older_than utf8.o utf8.c && {
$CC $CFLAGS -c utf8.c
}
older_than termbox.o termbox.c termbox.h input.inl output.inl bytebuffer.inl && {
$CC $CFLAGS -c termbox.c
}
older_than libtermbox.a *.o && {
ar rcs libtermbox.a *.o
}
noisy_cd ..
$CXX .build/*.o termbox/libtermbox.a -o .build/mu_bin
cp .build/mu_bin .
}
## [0-9]*.mu -> core.mu
MU_LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER |grep '.mu$') || exit 0 # ok if no .mu files
cat $MU_LAYERS |update core.mu
exit 0
# scenarios considered:
# no output when nothing needs updating
# only a single layer is recompiled when changing a C++ function
# stop immediately after failure in tangle
|