Added a -j/--parallelism flag to build.py to control the number of build threads

Author: JohnVidler

build.py

@@ -45,6 +45,7 @@
 parser.add_option('-r', '--revision', dest='revision', action="store", help='Checkout a specific revision of the target', default=False)
 parser.add_option('-d', '--dev', dest='dev', action="store_true", help='enable developer mode (does not use target-locked.json)', default=False)
 parser.add_option('-g', '--generate-docs', dest='generate_docs', action="store_true", help='generate documentation for the current target', default=False)
+parser.add_option('-j', '--parallelism', dest='parallelism', action="store", help='Set the number of parallel threads to build with, if supported', default=10)
 
 (options, args) = parser.parse_args()
 
@@ -139,7 +140,7 @@
         generate_docs()
         exit(0)
 
-    build(options.clean, verbose=options.verbose)
+    build(options.clean, verbose=options.verbose, parallelism=options.parallelism)
     exit(0)
 
 for json_obj in test_json:
@@ -166,4 +167,4 @@
     with open("../codal.json", 'w') as codal_json:
         json.dump(config, codal_json, indent=4)
 
-    build(True, True)
+    build(True, True, options.parallelism)

utils/python/codal_utils.py

@@ -15,7 +15,7 @@ def system(cmd):
     if os.system(cmd) != 0:
       sys.exit(1)
 
-def build(clean, verbose = False):
+def build(clean, verbose = False, parallelism = 10):
     if platform.system() == "Windows":
         # configure
         system("cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo -G \"Ninja\"")
@@ -25,9 +25,9 @@ def build(clean, verbose = False):
 
         # build
         if verbose:
-            system("ninja --verbose")
+            system(f"ninja -j {parallelism} --verbose")
         else:
-            system("ninja")
+            system(f"ninja -j {parallelism}")
     else:
         # configure
         system("cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo -G \"Unix Makefiles\"")
@@ -37,9 +37,9 @@ def build(clean, verbose = False):
 
         # build
         if verbose:
-            system("make -j 10 VERBOSE=1")
+            system(f"make -j {parallelism} VERBOSE=1")
         else:
-            system("make -j 10")
+            system(f"make -j {parallelism}")
 
 def read_json(fn):
     json_file = ""