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build3
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executable file
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#!/bin/sh
# Alternative to build2 that can stop after any step. For example:
# $ ./build3 mu.cc
set -e # stop immediately on error
# Some environment variables that can be passed in. For example, to turn off
# optimization:
# $ CFLAGS=-g ./build3
test "$CXX" || export CXX=c++
test "$CC" || export CC=cc
test "$CFLAGS" || export CFLAGS="-g -O2"
export CFLAGS="$CFLAGS -Wall -Wextra -ftrapv -fno-strict-aliasing"
export CXXFLAGS="-std=c++98 $CFLAGS" # CI has an ancient version; don't expect recent dialects
# Outline:
# [0-9]*.cc -> mu.cc -> .build/*.cc -> .build/*.o -> .build/mu_bin
# (layers) | | | |
# tangle cleave $CXX $CXX
## arg parsing
# can be called with a target to stop after a partial build
# $ ./build3 mu.cc
# can also be called with a layer to only build until
# $ ./build3 --until 050
# scenarios:
# ./build3 => TARGET= UNTIL_LAYER=zzz
# ./build3 x => TARGET=x UNTIL_LAYER=zzz
# ./build3 --until => TARGET= UNTIL_LAYER=zzz
# ./build3 --until 050 => TARGET= UNTIL_LAYER=050
TARGET=
UNTIL_LAYER=zzz
if [ $# -ge 1 ] && [ $1 != "--until" ]
then
TARGET=$1
fi
if [ $# -ge 2 ] && [ $1 = "--until" ]
then
UNTIL_LAYER=$2
fi
##
# 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
# return 1 if $1 is older than _any_ of the remaining args
# also exit the entire script if previous invocation was to update $TARGET
older_than() {
test $TARGET && test "$last_target" = "$TARGET" && exit 0
local target=$1
shift
last_target=$target
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
# no point checking for an early exit, because this usually runs in a pipeline/subshell
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
}
# cp file $1 to directory $2, unless it's already identical
# also exit the entire script if previous invocation was to update $TARGET
update_cp() {
test $TARGET && test "$last_target" = "$TARGET" && exit 0
last_target=$2/$1
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 $CXXFLAGS enumerate/enumerate.cc -o enumerate/enumerate
}
older_than tangle/tangle tangle/*.cc && {
noisy_cd tangle
# auto-generate various lists (ending in '_list' by convention) {
# list of types
{
grep -h "^struct .* {" [0-9]*.cc |sed 's/\(struct *[^ ]*\).*/\1;/'
grep -h "^typedef " [0-9]*.cc
} |update type_list
# list of function declarations, so I can define them in any order
grep -h "^[^ #].*) {" [0-9]*.cc |sed 's/ {.*/;/' |update function_list
# list of code files to compile
ls [0-9]*.cc |grep -v "\.test\.cc$" |sed 's/.*/#include "&"/' |update file_list
# list of test files to compile
ls [0-9]*.test.cc |sed 's/.*/#include "&"/' |update test_file_list
# list of tests to run
grep -h "^[[:space:]]*void test_" [0-9]*.cc |sed 's/^\s*void \(.*\)() {$/\1,/' |update test_list
grep -h "^\s*void test_" [0-9]*.cc |sed 's/^\s*void \(.*\)() {.*/"\1",/' |update test_name_list
# }
# Now that we have all the _lists, compile 'tangle'
$CXX $CXXFLAGS boot.cc -o tangle
./tangle test
noisy_cd .. # no effect; just to show us returning to the parent directory
}
LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER |grep '\.cc$')
older_than mu.cc $LAYERS enumerate/enumerate tangle/tangle && {
# no update here; rely on 'update' calls downstream
./tangle/tangle $LAYERS > mu.cc
}
older_than cleave/cleave cleave/cleave.cc && {
$CXX $CXXFLAGS cleave/cleave.cc -o cleave/cleave
rm -rf .build
}
mkdir -p .build
# auto-generate function declarations, so I can define them in any order
# functions start out unindented, have all args on the same line, and end in ') {'
#
# \/ ignore struct/class methods
grep -h "^[^[:space:]#].*) {$" mu.cc |grep -v ":.*(" |sed 's/ {.*/;/' |update .build/function_list
# auto-generate list of tests to run
grep -h "^\s*void test_" mu.cc |sed 's/^\s*void \(.*\)() {.*/\1,/' |update .build/test_list
grep -h "^\s*void test_" mu.cc |sed 's/^\s*void \(.*\)() {.*/"\1",/' |update .build/test_name_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
# create the list of global variable declarations from the corresponding definitions
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 $CXXFLAGS -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 $CXXFLAGS .build/*.o termbox/libtermbox.a -o .build/mu_bin
cp .build/mu_bin .
}
## [0-9]*.mu -> core.mu
MU_LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER |grep '\.mu$') || exit 0 # ok if no .mu files
cat $MU_LAYERS |update core.mu
exit 0
# scenarios considered:
# 0 status when nothing needs updating
# no output when nothing needs updating
# no output for mu.cc when .mu files modified
# touch mu.cc but don't modify it; no output on second build
# touch a .cc layer but don't modify it; no output on second build
# only a single layer is recompiled when changing a C++ function
# stop immediately after failure in tangle
# stop immediately after target provided at commandline