Allowed build under msys2 or cygwin

Author: SquallATF

core/src/main/rust/linker-wrapper.py

@@ -1,12 +1,31 @@
 from __future__ import absolute_import, print_function, unicode_literals
 
+import codecs
 import os
 import pipes
 import shutil
 import subprocess
 import sys
+import tempfile
+
+rustcc = os.environ['RUST_ANDROID_GRADLE_CC']
+
+if sys.platform == 'msys' or sys.platform == 'cygwin':
+    rustcc = subprocess.check_output(['/usr/bin/cygpath', '-u', rustcc]).decode('ascii').strip()
+
+args = [rustcc, os.environ['RUST_ANDROID_GRADLE_CC_LINK_ARG']] + sys.argv[1:]
+
+linkargfileName = ''
+if (sys.platform == 'msys' or sys.platform == 'cygwin') and len(''.join(args)) > 8191:
+    # response file should be use UTF-16 with BOM
+    linkargfile = tempfile.NamedTemporaryFile(delete=False)
+    linkargfile.write(codecs.BOM_UTF16_LE)
+    linkargfile.write('\n'.join(sys.argv[1:]).encode('utf-16-le'))
+    linkargfile.close()
+    linkargfileName = linkargfile.name
+    linkargfileNameW = subprocess.check_output(['/usr/bin/cygpath', '-w', linkargfileName]).decode('ascii').strip()
+    args = [rustcc, os.environ['RUST_ANDROID_GRADLE_CC_LINK_ARG'], '@' + linkargfileNameW]
 
-args = [os.environ['RUST_ANDROID_GRADLE_CC'], os.environ['RUST_ANDROID_GRADLE_CC_LINK_ARG']] + sys.argv[1:]
 
 # This only appears when the subprocess call fails, but it's helpful then.
 printable_cmd = ' '.join(pipes.quote(arg) for arg in args)
@@ -20,4 +39,6 @@
         with open(linkargs[0][1:]) as f:
             sys_argv = f.read().splitlines()
     shutil.copyfile(sys_argv[sys_argv.index('-o') + 1], os.environ['RUST_ANDROID_GRADLE_TARGET'])
+if linkargfileName != '':
+    os.unlink(linkargfileName)
 sys.exit(code)