175 lines
5.6 KiB
Bash
Executable File
175 lines
5.6 KiB
Bash
Executable File
#!/bin/sh
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# Alternative to build1 that tries to avoid redoing redundant work.
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# Also splits compilation into multiple .cc files (see 'cleave' below).
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# Faster than build1 for recompiling after small changes.
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#
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# For details on the basic form of this script, see https://notabug.org/akkartik/basic-build.
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set -e # stop immediately on error
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# Some environment variables that can be passed in. For example, to turn off
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# optimization:
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# $ CFLAGS=-g ./build2
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test "$CXX" || export CXX=c++
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test "$CC" || export CC=cc
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test "$CFLAGS" || export CFLAGS="-g -O2"
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export CFLAGS="$CFLAGS -Wall -Wextra -ftrapv -fno-strict-aliasing"
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# Outline:
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# [0-9]*.cc -> mu.cc -> .build/*.cc -> .build/*.o -> .build/mu_bin
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# (layers) | | | |
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# tangle cleave $CXX $CXX
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# can also be called with a layer to only build until
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# $ ./build2 --until 050
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UNTIL_LAYER=${2:-zzz}
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# there's two mechanisms for fast builds here:
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# - if a command is quick to run, always run it but update the result only on any change
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# - otherwise run it only if the output is 'older_than' the inputs
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#
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# avoid combining both mechanisms for 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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# 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 $1
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echo "-- `pwd`" >&2
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}
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older_than enumerate/enumerate enumerate/enumerate.cc && {
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$CXX $CFLAGS enumerate/enumerate.cc -o enumerate/enumerate
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}
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older_than tangle/tangle tangle/*.cc && {
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noisy_cd tangle
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# auto-generate various lists (ending in '_list' by convention) {
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# list of types
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{
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grep -h "^struct .* {" [0-9]*.cc |sed 's/\(struct *[^ ]*\).*/\1;/'
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grep -h "^typedef " [0-9]*.cc
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} |update type_list
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# list of function declarations, so I can define them in any order
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grep -h "^[^ #].*) {" [0-9]*.cc |sed 's/ {.*/;/' |update function_list
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# list of code files to compile
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ls [0-9]*.cc |grep -v "\.test\.cc$" |sed 's/.*/#include "&"/' |update file_list
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# list of test files to compile
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ls [0-9]*.test.cc |sed 's/.*/#include "&"/' |update test_file_list
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# list of tests to run
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grep -h "^[[:space:]]*void test_" [0-9]*.cc |sed 's/^\s*void \(.*\)() {$/\1,/' |update test_list
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grep -h "^\s*void test_" [0-9]*.cc |sed 's/^\s*void \(.*\)() {.*/"\1",/' |update test_name_list
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# }
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# Now that we have all the _lists, compile 'tangle'
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$CXX $CFLAGS boot.cc -o tangle
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./tangle test
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noisy_cd .. # no effect; just to show us returning to the parent directory
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}
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LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER |grep '\.cc$')
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older_than mu.cc $LAYERS enumerate/enumerate tangle/tangle && {
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# no update here; rely on 'update' calls downstream
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./tangle/tangle $LAYERS > mu.cc
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}
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older_than cleave/cleave cleave/cleave.cc && {
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$CXX $CFLAGS cleave/cleave.cc -o cleave/cleave
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rm -rf .build
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}
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mkdir -p .build
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# auto-generate function declarations, so I can define them in any order
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# functions start out unindented, have all args on the same line, and end in ') {'
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#
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# \/ ignore methods
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grep -h "^[^[:space:]#].*) {$" mu.cc |grep -v ":.*(" |sed 's/ {.*/;/' |update .build/function_list
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# auto-generate list of tests to run
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grep -h "^\s*void test_" mu.cc |sed 's/^\s*void \(.*\)() {.*/\1,/' |update .build/test_list
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grep -h "^\s*void test_" mu.cc |sed 's/^\s*void \(.*\)() {.*/"\1",/' |update .build/test_name_list
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mkdir -p .build/termbox
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update_cp termbox/termbox.h .build/termbox
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older_than mu_bin mu.cc *_list cleave/cleave termbox/* && {
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./cleave/cleave mu.cc .build
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noisy_cd .build
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# create the list of global variable declarations from the corresponding definitions
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grep ';' global_definitions_list |sed 's/[=(].*/;/' |sed 's/^[^\/# ]/extern &/' |sed 's/^extern extern /extern /' |update global_declarations_list
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for f in mu_*.cc
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do
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older_than `echo $f |sed 's/\.cc$/.o/'` $f header global_declarations_list function_list test_list && {
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$CXX $CFLAGS -c $f
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}
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done
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noisy_cd ../termbox
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older_than utf8.o utf8.c && {
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$CC $CFLAGS -c utf8.c
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}
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older_than termbox.o termbox.c termbox.h input.inl output.inl bytebuffer.inl && {
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$CC $CFLAGS -c termbox.c
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}
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older_than libtermbox.a *.o && {
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ar rcs libtermbox.a *.o
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}
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noisy_cd ..
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$CXX $CFLAGS .build/*.o termbox/libtermbox.a -o .build/mu_bin
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cp .build/mu_bin .
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}
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## [0-9]*.mu -> core.mu
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MU_LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER |grep '\.mu$') || exit 0 # ok if no .mu files
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cat $MU_LAYERS |update core.mu
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exit 0
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# scenarios considered:
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# 0 status when nothing needs updating
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# no output when nothing needs updating
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# no output for mu.cc when .mu files modified
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# touch mu.cc but don't modify it; no output on second build
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# touch a .cc layer but don't modify it; no output on second build
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# only a single layer is recompiled when changing a C++ function
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# stop immediately after failure in tangle
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