Stage ABI-scoped unit generations

scripts/build_linux.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -euo pipefail
 cd "$(dirname "$0")"
 cd ..
 
@@ -6,11 +7,14 @@ BUILDMODE=${2:-"debug"}
 OPT_FLAG="O0"
 GF="uce_fastcgi"
 
-mkdir bin > /dev/null 2>&1
-mkdir bin/tmp > /dev/null 2>&1
-mkdir bin/assets > /dev/null 2>&1
-mkdir bin/wasm > /dev/null 2>&1
-mkdir work > /dev/null 2>&1
+mkdir -p bin/tmp bin/assets bin/wasm work
+exec 9>bin/.build.lock
+flock 9
+build_tmp_files=()
+cleanup_build_tmp() {
+	((${#build_tmp_files[@]} == 0)) || rm -f "${build_tmp_files[@]}"
+}
+trap cleanup_build_tmp EXIT
 
 COMPILER="clang++"
 # -rdynamic is a link-time flag; the -c compiles below do not need it.
@@ -52,13 +56,16 @@ fi
 # SQLite: vendored C, depends only on its own source (not our headers).
 if needs_rebuild bin/sqlite3.o src/3rdparty/sqlite/sqlite3.c src/3rdparty/sqlite/sqlite3.h; then
 	echo "Compiling SQLite..."
+	tmp="bin/sqlite3.o.tmp.$$"
+	build_tmp_files+=("$tmp")
 	clang -g -O2 -fPIC \
 		-DSQLITE_THREADSAFE=1 \
 		-DSQLITE_OMIT_LOAD_EXTENSION=1 \
 		-DSQLITE_DQS=0 \
 		-DSQLITE_DEFAULT_FOREIGN_KEYS=1 \
 		-DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1 \
-		-c src/3rdparty/sqlite/sqlite3.c -o bin/sqlite3.o 2>&1 || exit 1
+		-c src/3rdparty/sqlite/sqlite3.c -o "$tmp" 2>&1
+	mv "$tmp" bin/sqlite3.o
 else
 	echo "Reusing bin/sqlite3.o"
 fi
@@ -67,7 +74,10 @@ fi
 # declarations (not the lib .cpp — those are compiled into main.o).
 if needs_rebuild bin/wasm.o src/wasm src/lib/*.h; then
 	echo "Compiling wasm backend..."
-	time -p $COMPILER -c src/wasm/wasm_module.cpp $SRCFLAGS $FLAGS $WASM_FLAGS -o bin/wasm.o 2>&1 || exit 1
+	tmp="bin/wasm.o.tmp.$$"
+	build_tmp_files+=("$tmp")
+	time -p $COMPILER -c src/wasm/wasm_module.cpp $SRCFLAGS $FLAGS $WASM_FLAGS -o "$tmp" 2>&1
+	mv "$tmp" bin/wasm.o
 else
 	echo "Reusing bin/wasm.o"
 fi
@@ -77,18 +87,19 @@ fi
 # (its only view of the wasm object) — but not the wasm .cpp sources.
 if needs_rebuild bin/main.o src/linux_fastcgi.cpp src/lib src/fastcgi src/wasm/backend.h; then
 	echo "Compiling main..."
-	time -p $COMPILER -c src/linux_fastcgi.cpp $SRCFLAGS $FLAGS -o bin/main.o 2>&1 || exit 1
+	tmp="bin/main.o.tmp.$$"
+	build_tmp_files+=("$tmp")
+	time -p $COMPILER -c src/linux_fastcgi.cpp $SRCFLAGS $FLAGS -o "$tmp" 2>&1
+	mv "$tmp" bin/main.o
 else
 	echo "Reusing bin/main.o"
 fi
 
 echo "Linking..."
-$COMPILER -rdynamic bin/main.o bin/wasm.o bin/sqlite3.o $FLAGS $LIBS -o bin/$GF.linux.bin 2>&1
-
-if [ $? -eq 0 ]
-then
-	ls -lh bin/ | grep $GF
-	exit 0
-else
-	exit 1
-fi
+binary_tmp="bin/$GF.linux.bin.tmp.$$"
+build_tmp_files+=("$binary_tmp")
+$COMPILER -rdynamic bin/main.o bin/wasm.o bin/sqlite3.o $FLAGS $LIBS -o "$binary_tmp" 2>&1
+test -s "$binary_tmp"
+chmod 0755 "$binary_tmp"
+mv "$binary_tmp" "bin/$GF.linux.bin"
+ls -lh "bin/$GF.linux.bin"