2 Commits

Author	SHA1	Message	Date
Jamie Schmeiser	efbf0136b4	Only issue warning for subtraction involving null pointers on live code paths ... Summary: Change the warning produced for subtraction from (or with) a null pointer to only be produced when the code path is live. https://github.com/llvm/llvm-project/issues/54570 Author: Jamie Schmeiser <schmeise@ca.ibm.com> Reviewed By: anarazel (Andres Freund) Differential Revision: https://reviews.llvm.org/D126816	2022-06-03 10:10:37 -04:00
Jamie Schmeiser	9cb00b9ecb	Reland Produce warning for performing pointer arithmetic on a null pointer. ... Summary: Test and produce warning for subtracting a pointer from null or subtracting null from a pointer. This reland adds the functionality that the warning is no longer reusing an existing warning, it has different wording for C vs C++ to refect the fact that nullptr-nullptr has defined behaviour in C++, it is suppressed when the warning is triggered by a system header and adds -Wnull-pointer-subtraction to allow the warning to be controlled. -Wextra implies -Wnull-pointer-subtraction. Author: Jamie Schmeiser <schmeise@ca.ibm.com> Reviewed By: efriedma (Eli Friedman), nickdesaulniers (Nick Desaulniers) Differential Revision: https://reviews.llvm.org/D98798	2021-07-20 10:12:20 -04:00