Can't display some variables in LLDB: unresolved identifier

Question

rnikander OP

Created Sep ’18

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The local variables are right there in the function in my current stack frame, but I can't look at them.

(lldb) po newPath

error: <EXPR>:3:1: error: use of unresolved identifier 'newPath'

Some variables print as expected, some dont.

SWIFT_OPTIMIZATION_LEVEL is -Onone. Xcode 10, build 10A254a.

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Answer 1

DTS Engineer OP

Apple

Sep ’18

Such problems can happen from time to time. Unless you’ve done something very wacky with your project settings the root cause is almost always a bug (specifically, a poor interaction between the compiler, the debugger, and the debugged process). If you can isolate the problem to a small test project, it’s definitely worth filing a bug report with that project.

In the meantime, you have some options. You can use

rather than

po

and, if that fails,

frame variable

. WWDC 2018 Session 412 Advanced Debugging with Xcode and LLDB has a really good explanation of how these are different, and lots of other general background on this issue

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