Re: [PATCH 10/10] reftable: make reftable_record a tagged union

Jeff King [off-list ref] writes:

quoted

error: ISO C99 doesn't support unnamed structs/unions [-Werror=pedantic]

Hmm. It's interesting that the regular DEVELOPER=1 doesn't catch this.
It's because we don't specify -std there, and newer gcc defaults to
gnu17 (unnamed unions appeared in c11, I think). I wonder if it would be
helpful to teach config.mak.dev to pass -std=c99.

FWIW, I use -std=gnu99 as our Makefile suggests.