"H.Merijn Brand" <h.m.brand@xxxxxxxxx> writes:
>> > Also because these are the *only* _POSIX_VERSION defines in the entire
>> > include tree, and 11.23 does have a select.h, which makes the patch below
>> > to be not OK on 11.23. I'm not stating that HP follows the rules in any
>> > correct way, but if this is to be sure that select.h gets included if the
>> > OS supports it, it will fail.
>> ...
>> But your grep did not catch their definition of _POSIX1_VERSION_$YEAR
>> which are used to define the actual value of _POSIX_VERSION.
>
> If it is used to *define* _POSIX_VERSION, it should have come up too,
> wouldn't it?
Sorry, I should re-read your grep output. It is possible that I am
quite confused.
Your grep session begins like this:
>> >> > /usr/include 103 > grep -r POSIX_VERSION *
>> >> > sys/unistd.h:# define _POSIX_VERSION _POSIX1_VERSION_88
>> >> > sys/unistd.h:# define _POSIX_VERSION _POSIX1_VERSION_90
>> >> > sys/unistd.h:# define _POSIX_VERSION _POSIX1_VERSION_93
Now, if they had
#define _POSIX1_VERSION_88 198808L
#define _POSIX1_VERSION_90 199009L
#define _POSIX1_VERSION_93 199309L
#define _POSIX1_VERSION_95 199506L
#define _POSIX1_VERSION_01 200112L
elsewhere in their include files, then
(1) "grep -r POSIX_VERSION *" wouldn't have matched them;
(2) not all of the three output form sys/unistd.h could be in effect at
the same time. There may be #ifdef around it to control which
definition is used, but your "grep" wouldn't have shown them
either.
Maybe HP-UX include files #ifdef the definition of _POSIX_VERSION
depending on what is asked for with feature test macros? We do not
define _POSIX_C_SOURCE to 200112L but we do define _XOPEN_SOURCE to 600.
According to:
http://www.opengroup.org/onlinepubs/000095399/functions/xsh_chap02_02.html
this should be sufficient to ask for POSIX.1-2001 features.
But in any case, 88/90/93 are all too old (predates 2001-12) so if these
three definitions are only possible values in their include files, then
we wouldn't see _POSIX_VERSION set to 200112L. That is unfortunate.
It seems we need to go back to that "NO_SYS_SELECT_H=YesPlease" thing.
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