Probe for preadv/pwritev in a more macOS-friendly way. Apple's mechanism for dealing with functions that are available in only some OS versions confuses AC_CHECK_FUNCS, and therefore AC_REPLACE_FUNCS. We can use AC_CHECK_DECLS instead, so long as we enable -Werror=unguarded-availability-new. This allows people compiling for macOS to control whether or not preadv/pwritev are used by setting MACOSX_DEPLOYMENT_TARGET, rather than supplying a back-rev SDK. (Of course, the latter still works, too.)
James Hilliard Discussion: https://postgr.es/m/20210122193230.25295-1-james.hillia...@gmail.com Branch ------ REL_14_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/e75da4f1b6c63523021e550f1a92c67d2b8a92fb Modified Files -------------- configure | 166 +++++++++++++++++++++++++++++++++++++------- configure.ac | 11 ++- src/include/pg_config.h.in | 14 ++-- src/include/port/pg_iovec.h | 4 +- src/tools/msvc/Solution.pm | 4 +- 5 files changed, 161 insertions(+), 38 deletions(-)
