问题
I'm trying to use proguard with Xamarin.
So I enabled it in project options (checked Enable ProGuard), and I created a file proguard.cfg in Properties, (as new Text file, is it right?)
and checked the BuildAction -> ProguardConfiguration
The proguard file contains only a -keep configuration, with a comment. Whether I leave or remove the comment, I always get a parse error on line 1 :
# test comment
-keep class !android.support.v7.view.menu.**, !android.support.design.internal.NavigationMenu, !android.support.design.internal.NavigationMenuPresenter, !android.support.design.internal.NavigationSubMenu, android.support.** {*;}
I get a Unknown option '' in line 1 error.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: Error: Tool exited with code: 1. Output: proguard.ParseException: Unknown option '' in line 1 of file 'Properties/proguard.cfg'
included from argument number 10 at proguard.ConfigurationParser.parse(ConfigurationParser.java:191) at proguard.ProGuard.main(ProGuard.java:484) (WheezMe.Droid)
Any idea ?
回答1:
I added this section of the docs awhile back to mention that you need to remove the BOM(Byte order mark):
Note: If you get an error like the following, then your configuration file contains a byte order mark (BOM), which the ProGuard tool cannot handle:
Unknown option '-keep' in line 1 of file 'proguard.cfg'
To prevent this problem, save your custom configuration file from a text editor that allows you to omit the BOM. For example, if you are saving from Notepad++, you can use the Encoding > Encode in UTF-8 Without BOM option to save your ProGuard configuration file without BOM.
https://developer.xamarin.com/guides/android/deployment,_testing,_and_metrics/publishing_an_application/part_1_-_preparing_an_application_for_release/#ProGuard
By all means you can use whatever method you'd like to remove the BOM. Notepad++ makes it pretty simple. Adding the full solution here to help others for visibility.
EDIT:
The proper link can be found here:
https://developer.xamarin.com/guides/android/deployment,_testing,_and_metrics/proguard/#File_Issues
回答2:
The byte order mark can also be removed from the file with the following perl command :
perl -e 's/\xef\xbb\xbf//;' -pi~ proguard.cfg
来源：https://stackoverflow.com/questions/38743557/xamarin-proguard-parseexception-unknown-option-in-line-1-of-file-properties