[cfe-dev] Assertion on valid use of highlighting whitespace

[Tom Care]

Hi all,

Whilst fixing bug 7377, I ran into an assertion when trying to highlight code in the following warning:

flag ' ' results in undefined behavior in 'p' conversion specifier

triggered by: printf("% p", p);

Assertion failed: (StartColNo <= EndColNo && "Trying to highlight whitespace??"), function HighlightRange, file /Volumes/Data/Users/tcare/Projects/llvm/tools/clang/lib/Frontend/TextDiagnosticPrinter.cpp, line 138.

The assertion is triggered by trying to highlight the format specifier ("% p")

This assertion seems valid, except for this rare case. Maybe there are others?

Any ideas on how to fix this?

Tom