[all-commits] [llvm/llvm-project] 843a97: Add a warning for builtin_return_address/frame_add...

[Erich Keane via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 843a9778fcd5ef93804fc22de04af9ab8c8b20a9
      https://github.com/llvm/llvm-project/commit/843a9778fcd5ef93804fc22de04af9ab8c8b20a9
  Author: Jeremy Stenglein <jstenglein at gmail.com>
  Date:   2020-03-09 (Mon, 09 Mar 2020)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticGroups.td
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/Sema/SemaChecking.cpp
    M clang/test/Misc/warning-wall.c

  Log Message:
  -----------
  Add a warning for builtin_return_address/frame_address with > 0 argument

Clang is missing a warning for
builtin_return_address/builtin_frame_address called with > 0 argument.
Gcc provides a warning for this via -Wframe-address:

https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html

As calling these functions with argument > 0 has caused several crashes
for us, we would like to have the same warning as gcc here. This diff
adds the warning and makes it part of -Wmost.

Differential Revision: https://reviews.llvm.org/D75768