https://bugs.llvm.org/show_bug.cgi?id=50644
Bug ID: 50644
Summary: User-defined literals generate false-positive
"Wreserved-identifier"
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: al42...@al42and.me
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
The C++11 standard requires user-defined suffixes to begin with the underscore.
However they seem to be considered reserved by Clang.
The following code, based on an example from
https://en.cppreference.com/w/cpp/language/user_literal, seems to erroneously
trigger the warning with the most recent commit of clang:
$ cat test.cpp
#include <string>
void operator "" _km(long double);
int main() { return 0; }
$ ./llvm-project/build/bin/clang -Wreserved-identifier -std=c++11 test.cpp
test.cpp:3:6: warning: identifier 'operator""_km' is reserved because it starts
with '_' at global scope [-Wreserved-identifier]
void operator "" _km(long double);
^
1 warning generated.
$ ./llvm-project/build/bin/clang --version
clang version 13.0.0 (https://github.com/llvm/llvm-project.git
206a66de5902b2b6dc0c62c4a25526d7e7f24186)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /tmp/./llvm-project/build/bin
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