[lldb-dev] How to set argument -Xxm100M for an executable?

Enrico Granata egranata at apple.com
Mon Oct 7 14:54:40 PDT 2013

On Oct 7, 2013, at 2:27 PM, Yin Ma <yin at affinic.com> wrote:

> Hi
> To set up a run argument, based on the document, it should be
> Settings set target.run-args  , like gdb set args
> However, no matter how, I cannot set my argument to –Xxm100M
> I tried
> Settings set target.run-args –Xxm100M
> Lldb: invalid option – X
> I also tried
> Settings set target.run-args “-Xxm100M”
> Doesn’t work.

Unfortunately you seem to be right. The only way I have been able to make this work is by saying:
(lldb) sett set target.run-args -- --Xxm100M
(lldb) r
Process 5112 launched: '/private/tmp/args' (x86_64)
argv[0] = args
argv[1] = --
argv[2] = --Xxm100M

but as you can see, this causes a spurious - - (double dash) to be passed down to your inferior process
Seems worth of a bugzilla to me. With that said, while I have not tried it, I am kinda optimistic that SBLaunchInfo (the API class) would not be subject to the same bug, since this is more of a command-line issue than anything

> Could somebody let me know how to correctly set an argument.
> On gdb, if we run
> Set args
> This means no argument
> However, under lldb
> Settings set target.run-args
> It will report an error
> Is this a good behavior?

In LLDB, you would say 
(lldb) sett set target.run-args ""

Since our settings set command is meant to set any kind of setting, it makes sense that we ask for an argument. If we were to allow setting set <foo> <end of command>, we would probably need a way to know which is the “default value” for any specific setting. Feel free to file an ER bugzilla for that too

> Thanks,
> Yin
> _______________________________________________
> lldb-dev mailing list
> lldb-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev

Enrico Granata
📩 egranata@.com
☎️ 27683

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/lldb-dev/attachments/20131007/087f09c0/attachment.html>

More information about the lldb-dev mailing list