mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-01-25 05:15:58 +00:00
db15673748
This allows command line tools to use syntaxes like the following: llvm-foo.exe command1 -o1 -o2 llvm-foo.exe command2 -p1 -p2 Where command1 and command2 contain completely different sets of valid options. This is backwards compatible with previous uses of llvm cl which did not support subcommands, as any option which specifies no optional subcommand (e.g. all existing code) goes into a special "top level" subcommand that expects dashed options to appear immediately after the program name. For example, code which is subcommand unaware would generate a command line such as the following, where no subcommand is specified: llvm-foo.exe -q1 -q2 The top level subcommand can co-exist with actual subcommands, as it is implemented as an actual subcommand which is searched if no explicit subcommand is specified. So llvm-foo.exe as specified above could be written so as to support all three aforementioned command lines simultaneously. There is one additional "special" subcommand called AllSubCommands, which can be used to inject an option into every subcommand. This is useful to support things like help, so that commands such as: llvm-foo.exe --help llvm-foo.exe command1 --help llvm-foo.exe command2 --help All work and display the help for the selected subcommand without having to explicitly go and write code to handle each one separately. This patch is submitted without an example of anything actually using subcommands, but a followup patch will convert the llvm-pdbdump tool to use subcommands. Reviewed By: beanz Differential Revision: http://reviews.llvm.org/D21485 llvm-svn: 274054