https://bugs.llvm.org/show_bug.cgi?id=37767
Bug ID: 37767
Summary: LLVM_NODISCARD does not work in for loops.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Support Libraries
Assignee: unassignedb...@nondot.org
Reporter: gchate...@google.com
CC: llvm-bugs@lists.llvm.org
See the following snippe (https://godbolt.org/g/DxoBaC)
> #include "llvm/Support/Error.h"
>
> struct A {
> llvm::Error foo() const;
> };
>
> void bar(llvm::ArrayRef<A> As) {
> for(const auto& A : As)
> A.foo(); // No warning.
> }
>
> void baz(llvm::ArrayRef<A> As) {
> As.front().foo(); // Warning.
> }
llvm::Error is marked LLVM_NODISCARD and should generate a warning if not
consumed.
`baz` generates a warning with clang but `bar` does not.
When using gcc, no warning is generated at all.
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