https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69850
--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Still happening even with latest patch: [1763/2142] Building CXX object tools/clang/lib/StaticAnalyzer/Core/CMakeFiles/clangStaticAnalyzerCore.dir/HTMLDiagnostics.cpp.o In file included from /home/trippels/llvm/tools/clang/include/clang/Rewrite/Core/RewriteBuffer.h:15:0, from /home/trippels/llvm/tools/clang/include/clang/Rewrite/Core/Rewriter.h:19, from /home/trippels/llvm/tools/clang/lib/StaticAnalyzer/Core/HTMLDiagnostics.cpp:21: /home/trippels/llvm/tools/clang/include/clang/Rewrite/Core/RewriteRope.h: In member function ‘void clang::RopeRefCountString::Release()’: /home/trippels/llvm/tools/clang/include/clang/Rewrite/Core/RewriteRope.h:43:30: warning: nonnull argument ‘this’ compared to NULL [-Wnonnull-compare] delete [] (char*)this; ^