https://bugs.llvm.org/show_bug.cgi?id=49604
Bug ID: 49604
Summary: Implement the -Winvalid-memory-model
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: antosh...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
C/C++ memory model is hard and people do a lot of errors with it. A warning
from compiler could be very useful for cases when particular memory order
should not be used with particular atomic operation. Foe example
* store operations and memory_order_acquire or memory_order_acq_rel
* load operations and memory_order_release or memory_order_acq_rel
* CAS and memory_order_release or memory_order_acq_rel
Some compilers already implement such warning with -Winvalid-memory-model flag.
Godbolt Playground: https://godbolt.org/z/79bf19
GCC related tikets: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69104 and
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99612
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