[lldb-dev] How to get the error message while creating an invalid target?

[Jeffrey Tan via lldb-dev]

Ah, I used CreateTargetWithFileAndArch() and missed this one. Feeling
embarrassed... Thank you!

On Wed, Mar 9, 2016 at 10:10 AM, Greg Clayton <gclayton at apple.com> wrote:

> The SBDebugger::CreateTarget() call take an "SBError &error" as the last
> argument. The error will contain any error message:
>
>     lldb::SBTarget
>     CreateTarget (const char *filename,
>                   const char *target_triple,
>                   const char *platform_name,
>                   bool add_dependent_modules,
>                   lldb::SBError& error);
>
>
>
> This function is the one that should be used. Any of the "const char *"
> arguments can be NULL. But typically you want to specify at least the
> filename. The triple is only really needed if you are debugging files that
> have more than one architecture or if the file you are debugging doesn't
> completely specify what you want to debug. The triple can be "x86_64" or
> more specific like "x86_64-apple-ios". The platform name only needs to be
> specified if your executable file (ELF file, mach-o file, or other exe
> format) doesn't have enough information inside of it to extract the triple
> from the object file. ELF has very sparse information inside of it to help
> us identify what platform it can/should be used for. You will know if you
> need to specify the platform if LLDB gets it wrong. To see what happens,
> try things out from the command line:
>
>
> (lldb) target create /tmp/a.out
> (lldb) target list
> Current targets:
> * target #0: /tmp/a.out ( arch=x86_64-apple-macosx, platform=host )
>
> We see that the "host" platform was auto selected and the architecture was
> extracted from the executable as "x86_64-apple-macosx".
>
> To see a list of platform names you can do:
>
> (lldb) platform select <TAB>
> Available completions:
>         remote-freebsd
>         remote-linux
>         remote-netbsd
>         remote-windows
>         kalimba
>         remote-android
>         remote-ios
>         remote-macosx
>         ios-simulator
>         darwin-kernel
>         tvos-simulator
>         watchos-simulator
>         remote-tvos
>         remote-watchos
>         remote-gdb-server
>
> So if you have an iOS binary that was targeting a device (not a
> simulator), you could create your target with:
>
> lldb::SBError error;
> lldb::SBTarget target = debugger.CreateTarget("/tmp/a.out",
> "armv7-apple-ios", "remote-ios", false, error);
>
>
> > On Mar 8, 2016, at 5:22 PM, Jeffrey Tan via lldb-dev <
> lldb-dev at lists.llvm.org> wrote:
> >
> > Hi,
> >
> > In lldb, when I try to "target create [invalid_target]", I got some
> meaningful error message like:
> > error: 'XXX' doesn't contain any 'host' platform architectures: x86_64h,
> x86_64, i386
> >
> > What is the python API to get this from? I tried to check
> SBTarget.IsValid() and then use
> SBTarget.GetDescription(eDescriptionLevelVerbose), but that does not return
> the error message.
> >
> > Thanks
> > Jeffrey
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
>
>
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