On Tue, Jan 18 2022, Neeraj Singh wrote: > The approach of building with C11 on FreeBSD is a good one > compared to trying to hack around the headers. The "hack around the headers" suggests that you've seen my alternate[1].... > It appears more like a compiler bug that's being worked around > here. The FreeBSD header supposedly uses a GCC extension if the > C standard version is less than C11. See: > https://github.com/freebsd/freebsd-src/blob/1e7b5f950b2d54ddb257d008592563c4d753aa54/sys/sys/cdefs.h#L317 ...which discusses how the line you're linking to here and __has_extension() interact, it's not a compiler bug, unless I'm missing something. I.e. it's just a FreeBSD include asking the compiler the wrong question and/or not suppressing the warning (e.g. via "#pragma clang system_header"). > Signed-off-by: Neeraj Singh <neerajsi@xxxxxxxxxxxxx> Accidentally addition? 1. https://lore.kernel.org/git/patch-1.1-06cc12be94d-20220118T151234Z-avarab@xxxxxxxxx/