Fixing build to tolerate some missing dependencies.

Be able to build without nodejs and d8.

configure.py

@@ -111,11 +111,14 @@ WIN_LFLAGS64 = [
   '/LIBPATH:"c:/Program Files (x86)/Windows Kits/10/Lib/10.0.19041.0/ucrt/x64"',
 ] + WIN_LIBS
 
+WEB_ENABLED = False
 PICO_ICE_ENABLED = False
-WINDOWS_ENABLED = False
 
+D8_AVAILABLE = False
+D8 = 'UNSUPPORTED'
+
+WINDOWS_ENABLED = False
 WINTMP = '/UNSUPPORTED'
-ARDUINO_CLI = 'UNSUPPORTED'
 WIN_CL32 = 'UNSUPPORTED'
 WIN_CL64 = 'UNSUPPORTED'
 WIN_LINK32 = 'UNSUPPORTED'
@@ -123,6 +126,8 @@ WIN_LINK64 = 'UNSUPPORTED'
 WIN_RC32 = 'UNSUPPORTED'
 WIN_RC64 = 'UNSUPPORTED'
 
+ARDUINO_CLI = 'UNSUPPORTED'
+
 # Mutable global state.
 build_files = []
 output = ''
@@ -169,24 +174,26 @@ def DetectWindowsTools(args):
 
 
 def DetectGenericTools(args):
-  global D8, NODEJS, PICO_ICE_ENABLED
+  global D8, D8_AVAILABLE, WEB_ENABLED, PICO_ICE_ENABLED
   try:
     D8 = LSQ('${HOME}/src/v8/v8/out/x64.release/d8')
+    D8_AVAILABLE = True
   except:
     if not args.quiet:
-      sys.stderr.write('V8 checkout in $HOME/src/v8 not found, ignoring.\n')
+      sys.stderr.write('V8 checkout in $HOME/src/v8 not found, '
+                       'disabling asm.js tests.\n')
   try:
-    NODEJS = LSQ('/usr/bin/nodejs')
+    LSQ('/usr/bin/nodejs')
+    WEB_ENABLED = True
   except:
     if not args.quiet:
-      sys.stderr.write('/usr/bin/nodejs not found, required!\n')
-      sys.exit(1)
+      sys.stderr.write('/usr/bin/nodejs not found, disabling web.\n')
   try:
     LSQ('/usr/bin/arm-none-eabi-gcc')
     PICO_ICE_ENABLED = True
   except:
     if not args.quiet:
-      sys.stderr.write('Missing package gcc-arm-none-eabi, pico-ice diabled!\n')
+      sys.stderr.write('Missing package gcc-arm-none-eabi, pico-ice disabled.\n')
 
 
 def FastOption():
@@ -232,7 +239,6 @@ WIN_RC32 = {WIN_RC32}
 WIN_RC64 = {WIN_RC64}
 
 D8 = {D8}
-NODEJS = {NODEJS}
 
 WIN_CFLAGS = {' '.join(WIN_CFLAGS)}
 WIN_LFLAGS32 = {' '.join(WIN_LFLAGS32)}

site/BUILD

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+if not WEB_ENABLED:
+  Return()
+
 OPTIONS = '-I $src/site'
 UE_OPTIONS = OPTIONS + ' -DFORTH=uEForth'
 ESP_OPTIONS = OPTIONS + ' -DFORTH=ESP32forth'

web/BUILD

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+if not WEB_ENABLED:
+  Return()
+
 Importation('$dst/gen/web_boot.js', '$src/web/web_boot.fs', header_mode='web', name='boot')
 Compile('$dst/gen/dump_web_opcodes', '$src/web/dump_web_opcodes.c')
 GenRun('$dst/gen/web_cases.js', '$dst/gen/dump_web_opcodes', 'cases', [])
@@ -31,21 +34,25 @@ WEB_ITEMS = [
   Copy('$dst/web/script_lite_test.html', '$src/web/script_lite_test.html'),
   Copy('$dst/web/script_test.html', '$src/web/script_test.html'),
   Copy('$dst/web/script_test.fs', '$src/web/script_test.fs'),
-  TestCommand('$dst/tests/web_sanity_test.out',
-              ' '.join([
-                  '$dst/web/ueforth.js',
-                  '$src/tools/check_web_sanity.py',
-              ]),
-              'echo "120 3 + . cr bye" | ' + D8 + ' $dst/web/ueforth.js | '
-              '$src/tools/check_web_sanity.py $dst/tests/web_sanity_test.out'),
 ]
 
+if D8_AVAILABLE:
+  WEB_ITEMS += [
+    TestCommand('$dst/tests/web_sanity_test.out',
+                ' '.join([
+                    '$dst/web/ueforth.js',
+                    '$src/tools/check_web_sanity.py',
+                ]),
+                'echo "120 3 + . cr bye" | ' + D8 + ' $dst/web/ueforth.js | '
+                '$src/tools/check_web_sanity.py ' +
+                '$dst/tests/web_sanity_test.out'),
+  ]
+
 Alias('web', ' '.join(WEB_ITEMS))
 Default('web')
 
-D8 = '~/src/v8/v8/out/x64.release/d8 $dst/web/ueforth.js'
-
-OneShot('d8',
-        '$dst/web/ueforth.js',
-        D8 + ' $in',
-        pool='console')
+if D8_AVAILABLE:
+  OneShot('d8',
+          '$dst/web/ueforth.js',
+          D8 + ' $dst/web/ueforth.js $in',
+          pool='console')