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