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b6c4205149
As reported in PR gdb/28076 [1], passing no condition argument to the -break-condition command (e.g.: "-break-condition 2") should clear the condition for breakpoint 2, just like CLI's "condition 2", but instead an error message is returned: ^error,msg="-break-condition: Missing the <number> and/or <expr> argument" The current implementation of the -break-condition command's argument handling (79aabb7308c "gdb/mi: add a '--force' flag to the '-break-condition' command") was done according to the documentation, where the condition argument seemed mandatory. However, the -break-condition command originally (i.e. before the 79aabb7308c patch) used the CLI's "cond" command, and back then not passing a condition argument was clearing out the condition. So, this is a regression in terms of the behavior. Fix the argument handling of the -break-condition command to allow not having a condition argument, and also update the document to make the behavior clear. Also add test cases to test the scenarios which were previously not covered. [1] https://sourceware.org/bugzilla/show_bug.cgi?id=28076