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Probe for preadv/pwritev in a more macOS-friendly way.

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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.hilliard1@gmail.com
This commit is contained in:
Tom Lane
2021-07-12 19:17:35 -04:00
parent f10f0ae420
commit f014b1b9bb
5 changed files with 161 additions and 38 deletions
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4
src/tools/msvc/Solution.pm
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@ -245,6 +245,8 @@ sub GenerateFiles
HAVE_DECL_LLVMGETHOSTCPUFEATURES => 0,
HAVE_DECL_LLVMORCGETSYMBOLADDRESSIN => 0,
HAVE_DECL_POSIX_FADVISE => undef,
HAVE_DECL_PREADV => 0,
HAVE_DECL_PWRITEV => 0,
HAVE_DECL_RTLD_GLOBAL => 0,
HAVE_DECL_RTLD_NOW => 0,
HAVE_DECL_STRLCAT => undef,
@ -335,7 +337,6 @@ sub GenerateFiles
HAVE_PPC_LWARX_MUTEX_HINT => undef,
HAVE_PPOLL => undef,
HAVE_PREAD => undef,
HAVE_PREADV => undef,
HAVE_PSTAT => undef,
HAVE_PS_STRINGS => undef,
HAVE_PTHREAD => undef,
@ -343,7 +344,6 @@ sub GenerateFiles
HAVE_PTHREAD_IS_THREADED_NP => undef,
HAVE_PTHREAD_PRIO_INHERIT => undef,
HAVE_PWRITE => undef,
HAVE_PWRITEV => undef,
HAVE_RANDOM => undef,
HAVE_READLINE_H => undef,
HAVE_READLINE_HISTORY_H => undef,