https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104030
Bug ID: 104030
Summary: -Wbidi-chars should not warn about UCNs
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: sbergman at redhat dot com
Target Milestone: ---
As discussed in the sub-thread starting at
<https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585710.html> "Re:
[PATCH] libcpp: Implement -Wbidi-chars for CVE-2021-42574 [PR103026]",
-Wbidi-chars should not emit warnings when the problematic characters are
written as UCNs rather than verbatim. For example, the line
> aText = u"\u202D" + aText;
found in the LibreOffice source code should not cause a warning (which couldn't
even be silenced with a local `#pragma GCC diagnostic ignored "-Wbidi-chars"`
due to bug 53431).
