[llvm-bugs] [Bug 46623] New: Format options for attributes, ability to specify custom attributes.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46623

            Bug ID: 46623
           Summary: Format options for attributes, ability to specify
                    custom attributes.
           Product: clang
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alliepiper16 at gmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Clang-format currently does not have options to control attribute formatting.

Some projects prefer to put prefix attributes on a separate line, eg:

[[nodiscard]]
int foo();

instead of:

[[nodiscard]] int foo();

Additionally, it would be useful to be able to provide a list of regexes that
identify custom attributes. Maintaining an exhaustive list of attributes in
clang-format proper would be daunting, as many projects hide them behind macros
for backward compatibility, or rely on platform-specific attributes. Allowing
projects to extend the list of recognized attributes would be quite useful.

My personal interest in this stems from using clang-format on CUDA projects,
where `__host__ __device__` annotations are frequently used and commonly placed
on the line above a function definition. Being able to achieve this common
formatting style would ease adoption of clang-format by CUDA projects.

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