[lldb-dev] Global lldbinit file?

Thu Jan 29 11:43:12 PST 2015

FWIW, this is partly why I had the idea for like an LLDB_PYTHON_HOME
environment variable.

1) CMake could look for it and (if found) skip the FindPythonLibs codepath
entirely, setting the PYTHON_INCLUDE_DIR, PYTHON_LIBRARY, and
PYTHON_EXECUTABLE appropriately to files / folders located under your
%LLDB_PYTHON_HOME%
path.  So for people who compile LLDB themselves and then run, both the
compile step and the run step would "just work" with no extra setup.
2) It also works for running LLDB on a system other than the one it was
compiled on, because you can point LLDB to any version of python on your
system via a 1-time export.

Although long term, I like Greg's idea of moving towards something
bundle-like for Linux / Windows.

On Thu Jan 29 2015 at 11:22:56 AM Zachary Turner <zturner at google.com> wrote:

> Yes, the problem is when you have multiple pythons.  For example I have
> python on my system for doing actual python development unrelated to LLDB,
> and for that i want a regular release distribution, not the debug version
> i've compiled myself.  FindPythonLibs finds the installed version though.
>
> FindPythonLibs also doesn't work correctly for 64-bit builds, because it
> only looks in the Wow64 registry key, so if you've installed x86 and x64
> pythons, it will never find the x64 one.
>
> We need to handle this case, because due to the requirement that you build
> your own python, it's going to be very common that people will not want to
> use the same python they're using for LLDB as other types of python
> development.
>
> On Thu Jan 29 2015 at 11:17:57 AM Ted Woodward <
> ted.woodward at codeaurora.org> wrote:
>
>> I don’t set any of those on my Windows builds. cmake 2.8.11.2 finds my
>> python in c:\python27. I took a standard install and replaced the supplied
>> binaries with the ones I built using VS 2013, and added the debug binaries
>> for debug builds.
>>
>>
>>
>> --
>>
>> Qualcomm Innovation Center, Inc.
>>
>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
>> Linux Foundation Collaborative Project
>>
>>
>>
>> *From:* Zachary Turner [mailto:zturner at google.com]
>> *Sent:* Thursday, January 29, 2015 11:48 AM
>>
>>
>> *To:* Ted Woodward; Greg Clayton
>> *Cc:* Jim Ingham; lldb-dev at cs.uiuc.edu
>> *Subject:* Re: [lldb-dev] Global lldbinit file?
>>
>>
>>
>> Ahh, I was conflating the issue of PYTHONHOME/PYTHONPATH with that of the
>> global init file, but they solve different problems.
>>
>>
>>
>> One thing I'm curious to see how your PYTHONHOME/PYTHONPATH patch
>> addresses is that of number of CMake variables.  I already have to set 3
>> CMake variables just for python.  PYTHON_LIBRARY, PYTHON_EXECUTABLE, and
>> PYTHON_INCLUDE_DIR.  I'm not too crazy about having to set 2 more in
>> addition to these.  Unfortunately CMake's FindPythonLibs package doesn't
>> work correctly on Windows, so there's not a good workaround for having to
>> set all these variables manually other than to just not use the package.
>>
>>
>>
>> On Thu, Jan 29, 2015 at 8:40 AM Ted Woodward <ted.woodward at codeaurora.org>
>> wrote:
>>
>> Right. If the community doesn’t want an installation-global lldbinit
>> file, I’ll just modify the drivers as suggested earlier.
>>
>>
>>
>> To replace my wrapper scripts, I need that, and a way to find the python
>> install automatically. I’ve just about got the 2nd one done J
>>
>>
>>
>> --
>>
>> Qualcomm Innovation Center, Inc.
>>
>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
>> Linux Foundation Collaborative Project
>>
>>
>>
>> *From:* Zachary Turner [mailto:zturner at google.com]
>> *Sent:* Thursday, January 29, 2015 10:33 AM
>> *To:* Ted Woodward; Greg Clayton
>>
>>
>> *Cc:* Jim Ingham; lldb-dev at cs.uiuc.edu
>> *Subject:* Re: [lldb-dev] Global lldbinit file?
>>
>>
>>
>> that still doesn't address your initial concern does it? Otherwise there
>> would be no need for the global lldbinit file. What im suggesting removes
>> the need for a PYTHONHOME and PYTHONPATH entirely, and instead relies on a
>> one-time system setting.
>>
>> On Thu, Jan 29, 2015 at 8:26 AM Ted Woodward <ted.woodward at codeaurora.org>
>> wrote:
>>
>> I’ve got a patch that’s being reviewed internally that lets you set cmake
>> variables to set the default PYTHONHOME and PYTHONPATH. These get passed in
>> on the compile line and are used to set PYTHONHOME and PYTHONPATH, if
>> they’re not in the environment. I hope to have it done and up on
>> phabricator soon. It works on Windows and Linux, and I assume other Unix
>> variants.
>>
>>
>>
>> --
>>
>> Qualcomm Innovation Center, Inc.
>>
>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
>> Linux Foundation Collaborative Project
>>
>>
>>
>> *From:* Zachary Turner [mailto:zturner at google.com]
>> *Sent:* Wednesday, January 28, 2015 10:08 PM
>> *To:* Greg Clayton; Ted Woodward
>> *Cc:* Jim Ingham; lldb-dev at cs.uiuc.edu
>>
>>
>> *Subject:* Re: [lldb-dev] Global lldbinit file?
>>
>>
>>
>> I'm not too familiar with how bundles work on MacOSX, but I think having
>> LLDB just be able to know where to look without any special configuration
>> is the way to go.  It sounds like that's what bundles solve.  In the
>> interim I think a possible solution for this on Windows is to just have
>> LLDB look for LLDB_PYTHON_HOME.  If it finds it, it will expect to find
>> Python there and call PySys_SetPath appropriately during initialization.
>> If it doesn't, then it's up to the user to have a properly configured
>> PYTHONHOME and PYTHONPATH.
>>
>>
>>
>> This way, on hexagon machines, installation of LLDB could involve setting
>> this environment variable to the appropriate value.  It would also be
>> useful for non-hexagon Windows as well, because the current state of
>> affairs requires you to have a bunch of environment variables pointing to
>> the correct locations on your disk, which is not very user friendly and a
>> source of error when trying to build on Windows.
>>
>>
>>
>> On Wed Jan 28 2015 at 12:32:12 PM Greg Clayton <gclayton at apple.com>
>> wrote:
>>
>> Then you should be able to have a ".lldbinit-hexagon-lldb" file that will
>> get sourced. The main questions is if there is a good place to put this
>> file when there are no bundles on linux or windows. On LLDB, the
>> LLDB.framework contains everything we need (headers, resources, support
>> binaries (debugserver, lldb-gdbserver lldb-platform, darwin-debug, and
>> more) and the lldb python modules.
>>
>> Maybe we can start paving the way for bundles on windows and linux with
>> LLDB?
>>
>> Greg
>>
>> > On Jan 28, 2015, at 11:54 AM, Ted Woodward <ted.woodward at codeaurora.org>
>> wrote:
>> >
>> > All the llvm tools in our installation have "hexagon-" prepended too
>> them, so lldb is really hexagon-lldb.
>> >
>> > Right now we use a wrapper script that looks something like this:
>> >
>> > DIR=$(dirname $0)
>> > export PYTHONHOME=$DIR/..
>> > exec $DIR/hexagon-lldb-3.5.0 -o "command script import
>> $DIR/hexagon_utils.py" "$@"
>> >
>> > I'd like to replace the '-o "command script import
>> $DIR/hexagon_utils.py"' with something that gets loaded automatically, so I
>> can set PYTHONHOME and just run hexagon-lldb-3.5.0 and get my utility
>> scripts. I can do this with custom drivers (1 for lldb, 1 for lldb-mi), but
>> I'd hoped to stay as close to the upstream code as possible.
>> >
>> > --
>> > Qualcomm Innovation Center, Inc.
>> > The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>> >
>> > -----Original Message-----
>> > From: jingham at apple.com [mailto:jingham at apple.com]
>> > Sent: Wednesday, January 28, 2015 1:40 PM
>> > To: Zachary Turner
>> > Cc: Ted Woodward; lldb-dev at cs.uiuc.edu
>> > Subject: Re: [lldb-dev] Global lldbinit file?
>> >
>> > First off, the fact that git does something at the user-interface level
>> seems rather an argument against doing it that for...
>> >
>> > But also, in git's case it makes some sense to have global
>> configurations, for instance to implement policies for everybody on a team,
>> or something like that.  But I don't see that strong a use case for that
>> for lldb.  Plus, the particular instance seems another counter-argument,
>> since as I understand it the Hexagon init is going to change the behavior
>> of lldb significantly.  I would rather if that happen I know this is not
>> vanilla lldb, because it is called "lldb-hex" or something...
>> >
>> > Jim
>> >
>> >> On Jan 28, 2015, at 11:27 AM, Zachary Turner <zturner at google.com>
>> wrote:
>> >>
>> >> Personally I'm a big fan of this model.  Sort of like what git does,
>> where you have different install files in different scopes, and it starts
>> by parsing the global config first, then the user-level config, then the
>> local config, overwriting values in the process.
>> >>
>> >> So in Ted's scenario, for example, maybe lldb could load ~/.lldbinit
>> first, then look in the same folder as the executable for a .lldbinit and
>> load it second.
>> >>
>> >> On Wed Jan 28 2015 at 11:21:13 AM Ted Woodward <
>> ted.woodward at codeaurora.org> wrote:
>> >> I'm sorry; I wasn't clear. When I say "global", I mean "global to this
>> installation", not "global to the system".
>> >>
>> >> My idea was something like /inst/hexagon/Tools/bin/lldb would load
>> /inst/hexagon/Tools/bin/lldbinit. Another lldb installation, say
>> /inst/Xcode/bin/lldb, wouldn't see it, or be affected by it.
>> >>
>> >> --
>> >> Qualcomm Innovation Center, Inc.
>> >> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>> >>
>> >> -----Original Message-----
>> >> From: jingham at apple.com [mailto:jingham at apple.com]
>> >> Sent: Wednesday, January 28, 2015 1:12 PM
>> >> To: Ted Woodward
>> >> Cc: lldb-dev at cs.uiuc.edu
>> >> Subject: Re: [lldb-dev] Global lldbinit file?
>> >>
>> >> This worries me a little bit.  I install your Hexagon lldb, and that
>> installs a global lldbinit, which then starts affecting my use of the other
>> lldb's I happen to have on my system in ways that are not at all clear to
>> me...  That doesn't seem like a good idea to me.
>> >>
>> >> gdb had a global configuration file in /etc/conf, and Apple's gdb
>> installation   used it for a few things (this was actually done at NeXT and
>> NOT by me...) - mainly setting some common print variables.  But this just
>> ended up causing more confusion than it was worth.  It would have been
>> better to just bake these into the gdb driver we shipped...
>> >>
>> >> I would suggest distributing your lldb as lldb-hex or something like
>> that, and including a template .lldbinit-hex that folks could install, or
>> making your own driver that sets the options you want first.
>> >>
>> >> Jim
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>> On Jan 28, 2015, at 9:40 AM, Ted Woodward <
>> ted.woodward at codeaurora.org> wrote:
>> >>>
>> >>>
>> >>> When LLDB launches, it will read ~/.lldbinit (and possibly other
>> variants of that, like ~/.lldbinit-Xcode).
>> >>>
>> >>> In my Hexagon LLDB installation, I want LLDB to always load a global
>> lldbinit file. Currently I do this by having lldb be a wrapper script that
>> calls lldb with –o, but I’d like to eliminate the wrapper script, since
>> wrapper batch files cause problems with ctrl-c handling on Windows. I use
>> this to load a python file with utilities in it, like one to get the TLB
>> info from the target. It sends a qXfer command to the remote GDB server to
>> download an XML file, parses it, and prints the info from it. These
>> utilities need to load for all users.
>> >>>
>> >>> Do we have a global lldbinit file, or should I add code to load
>> Host::GetProgramFileSpec()/lldbinit?
>> >>>
>> >>> --
>> >>> Qualcomm Innovation Center, Inc.
>> >>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora
>> Forum, a Linux Foundation Collaborative Project
>> >>>
>> >>> _______________________________________________
>> >>> lldb-dev mailing list
>> >>> lldb-dev at cs.uiuc.edu
>> >>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>> >>
>> >>
>> >>
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>> >
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