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
> <[email protected]> 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
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