Let build-prebuilts.sh compile unit tests

build-prebuilts.sh compiles header-checker-unittests by default. The
continuous builds ensure that the tests are compilable. The developers
can use the script to build the tests locally.

Test: OUT_DIR=out BUILD_BROKEN_DISABLE_BAZEL=1 \
      development/vndk/tools/header-checker/android/build-prebuilts.sh \
      header-checker-unittests
Test: OUT_DIR=out BUILD_BROKEN_DISABLE_BAZEL=1 DIST_DIR=/tmp/distdir \
      development/vndk/tools/header-checker/android/build-prebuilts.sh
Bug: 280008249
Change-Id: I32d6ade3c527785d68802c1737c94f963ead5b3c

vndk/tools/header-checker/android/build-prebuilts.sh

@@ -18,19 +18,39 @@ usage() {
     echo "Usage: $(basename "$0") [build_target]..."
     echo "    Build all targets if build_target is not specified."
     echo "    Supported build targets for macOS: ${MACOS_SOONG_BINARIES[*]}"
-    echo "    Supported build targets for Linux: ${LINUX_SOONG_BINARIES[*]}"
+    echo "    Supported build targets for Linux:" \
+         "${LINUX_SOONG_BINARIES[@]}" "${LINUX_SOONG_TESTS[@]}"
 }
 
-valid_build_target () {
-    for i in "${VALID_SOONG_BINARIES[@]}"; do
-        if [ "$i" = "$1" ]; then
-            return 0
-        fi
+in_array () {
+    value="$1"
+    shift
+    for i in "$@"; do
+        [ "$i" = "${value}" ] && return 0
     done
     return 1
 }
 
-SOONG_BINARIES=()
+LINUX_SOONG_BINARIES=(
+    "bindgen"
+    "cxx_extractor"
+    "header-abi-linker"
+    "header-abi-dumper"
+    "header-abi-diff"
+    "proto_metadata_plugin"
+    "protoc_extractor"
+    "versioner"
+)
+
+LINUX_SOONG_TESTS=(
+    "header-checker-unittests"
+)
+
+MACOS_SOONG_BINARIES=(
+    "versioner"
+)
+
+BUILD_TARGETS=()
 
 while [ $# -gt 0 ]; do
     case $1 in
@@ -38,8 +58,8 @@ while [ $# -gt 0 ]; do
             usage
             exit 0
             ;;
-        *) # Add specified build targets into SOONG_BINARIES
-            SOONG_BINARIES+=("$1")
+        *) # Add specified build targets into BUILD_TARGETS
+            BUILD_TARGETS+=("$1")
             ;;
     esac
     shift
@@ -63,42 +83,37 @@ Darwin)
     ;;
 esac
 
-LINUX_SOONG_BINARIES=(
-    "bindgen"
-    "cxx_extractor"
-    "header-abi-linker"
-    "header-abi-dumper"
-    "header-abi-diff"
-    "proto_metadata_plugin"
-    "protoc_extractor"
-    "versioner"
-)
-
-MACOS_SOONG_BINARIES=(
-    "versioner"
-)
-
 # Targets to be built
 if [ "${OS}" = "darwin" ]; then
     VALID_SOONG_BINARIES=("${MACOS_SOONG_BINARIES[@]}")
+    VALID_SOONG_TESTS=()
 else
     VALID_SOONG_BINARIES=("${LINUX_SOONG_BINARIES[@]}")
+    VALID_SOONG_TESTS=("${LINUX_SOONG_TESTS[@]}")
 fi
 
-if [ "${#SOONG_BINARIES[@]}" -eq 0 ]; then
-    # SOONG_BINARIES is empty, so there must be no commandline argument, thus we
-    # build everything.
-    SOONG_BINARIES=("${VALID_SOONG_BINARIES[@]}")
-fi
+SOONG_BINARIES=()
+SOONG_TESTS=()
 
 # Check if all specified targets are valid
-for name in "${SOONG_BINARIES[@]}"; do
-  if ! valid_build_target "${name}"; then
-    echo "build_target ${name} is not one of the supported targets: ${VALID_SOONG_BINARIES[*]}"
-    exit 1
-  fi
+for name in "${BUILD_TARGETS[@]}"; do
+    if in_array "${name}" "${VALID_SOONG_BINARIES[@]}"; then
+        SOONG_BINARIES+=("${name}")
+    elif in_array "${name}" "${VALID_SOONG_TESTS[@]}"; then
+        SOONG_TESTS+=("${name}")
+    else
+        echo "build_target ${name} is not one of the supported targets:" \
+             "${VALID_SOONG_BINARIES[@]}" "${VALID_SOONG_TESTS[@]}"
+        exit 1
+    fi
 done
 
+if [ "${#BUILD_TARGETS[@]}" -eq 0 ]; then
+    # Build everything by default.
+    SOONG_BINARIES=("${VALID_SOONG_BINARIES[@]}")
+    SOONG_TESTS=("${VALID_SOONG_TESTS[@]}")
+fi
+
 if [ -z "${OUT_DIR}" ]; then
     echo "error: Must set OUT_DIR"
     exit 1
@@ -133,12 +148,15 @@ if [ "${OS}" = "darwin" ]; then
 fi
 
 # Build binaries and shared libs
-build/soong/soong_ui.bash --make-mode --skip-config --soong-only "${binaries[@]}" "${libs[@]}"
+build/soong/soong_ui.bash --make-mode --skip-config --soong-only \
+  "${binaries[@]}" "${libs[@]}" "${SOONG_TESTS[@]}"
 
 # Copy binaries and shared libs
 SOONG_DIST="${SOONG_OUT}/dist"
 mkdir -p "${SOONG_DIST}/bin"
-cp "${binaries[@]}" "${SOONG_DIST}/bin"
+if [ -n "${binaries}" ]; then
+    cp "${binaries[@]}" "${SOONG_DIST}/bin"
+fi
 cp -R "${SOONG_HOST_OUT}/lib64" "${SOONG_DIST}"
 # create symlink lib -> lib64 as toolchain libraries have a RUNPATH pointing to
 # $ORIGIN/../lib instead of lib64
@@ -180,12 +198,12 @@ for file in "${SOONG_OUT}/dist/lib"*"/"*; do
 done
 
 # Package binaries and shared libs
-(
-    cd "${SOONG_OUT}/dist"
+if [ -z "${DIST_DIR}" ]; then
+    echo "DIST_DIR is empty. Skip zipping binaries."
+else
+    pushd "${SOONG_OUT}/dist"
     zip -qryX build-prebuilts.zip *
-)
-
-if [ -n "${DIST_DIR}" ]; then
+    popd
     mkdir -p "${DIST_DIR}" || true
     cp "${SOONG_OUT}/dist/build-prebuilts.zip" "${DIST_DIR}/"
 fi