[llvm-bugs] [Bug 28253] New: lldb-mi Regression with LLDB_DISABLE_PYTHON=1

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28253

            Bug ID: 28253
           Summary: lldb-mi Regression with LLDB_DISABLE_PYTHON=1
           Product: lldb
           Version: 3.8
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at lists.llvm.org
          Reporter: pierson.lee at microsoft.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

When running self-built lldb-mi(3.8.1) with LLDB_DISABLE_PYTHON=1, on execution
time, I'm getting: 

MI: Error: Driver. LLDB Debugger.
MI: Error: Driver Manager. Driver 'Machine Interface Driver Version: 1.0.0.9'
(ID:'MIDriver') initialise failed. Driver. LLDB Debugger.


Ilia K helped me determine that it is due to r251082 change.

The suggested workaround is: 

1. ignore MI_add_summary's errors by returning TRUE:
```
Index: tools/lldb-mi/MICmnLLDBDebugger.cpp
===================================================================
--- tools/lldb-mi/MICmnLLDBDebugger.cpp    (revision 273137)
+++ tools/lldb-mi/MICmnLLDBDebugger.cpp    (working copy)
@@ -58,7 +58,7 @@
                uint32_t options, bool regex = false)
 {
 #if defined(LLDB_DISABLE_PYTHON)
-    return false;
+    return true;
 #else
     lldb::SBTypeSummary summary = lldb::SBTypeSummary::CreateWithCallback(cb,
options);
     return summary.IsValid() ?
category.AddTypeSummary(lldb::SBTypeNameSpecifier(typeName, regex), summary) :
false;
```

In this case, wide chars will not be expanded unlike simple chars:
```
(gdb) -var-create - * cp
^done,name="var7",numchild="1",value="0x0000000000400cb4
\"\\t\\\"hello\\\"\\n\"",type="const char *",thread-id="1",has_more="0"
(gdb) -var-create - * u16p
^done,name="var9",numchild="1",value="0x0000000000400d64",type="const char16_t
*",thread-id="1",has_more="0"
```

2. or you can try to revert r251082


I did #1 but would probably like wide chars to be expanded (which it does not
with the workaround).

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