Added support for extended command line to overcome OS command line length limitation

authors.txt

@@ -24,3 +24,4 @@ German Diago Gomez
 Kyle Manna
 Haakon Sporsheim
 Wink Saville
+Yoav Alon

meson.py

@@ -174,6 +174,9 @@ def run(args):
         handshake = True
     else:
         handshake = False
+    args = mesonlib.expand_arguments(args)
+    if not args:
+        return 1
     options = parser.parse_args(args[1:])
     if options.print_version:
         print(coredata.version)

mesonconf.py

@@ -180,7 +180,10 @@ class Conf:
             self.print_aligned(optarr)
 
 if __name__ == '__main__':
-    options = parser.parse_args()
+    args = mesonlib.expand_arguments(sys.argv[:])
+    if not args:
+        sys.exit(1)
+    options = parser.parse_args(args[1:])
     if len(options.directory) > 1:
         print('%s <build directory>' % sys.argv[0])
         print('If you omit the build directory, the current directory is substituted.')

mesonlib.py

@@ -264,3 +264,21 @@ def stringlistify(item):
         if not isinstance(i, str):
             raise MesonException('List item not a string.')
     return item
+
+def expand_arguments(args):
+    expended_args = []
+    for arg in args:
+        if not arg.startswith('@'):
+            expended_args.append(arg)
+            continue
+
+        args_file = arg[1:]
+        try:
+            with open(args_file) as f:
+                extended_args = f.read().split()
+            expended_args += extended_args
+        except Exception as e:
+            print('Error expanding command line arguments, %s not found' % args_file)
+            print(e)
+            return None
+    return expended_args