64-bit time_t on glibc 2.34 and up

[Hal Murray]

Greg via Gary said:
> Does Linux version syscalls?  In NetBSD, we change the codepoints when the
> ABI changes, and there is kernel code to implement the old codepoint (but no
> header support) so old binaries still work.  I think Solaris does this too. 

They do something like that.  I'm not familiar with the details but there are 
lots of syscalls with names like foo64 to go with foo.

There are differences between architectures.

This all gets tangled up with the libraries too.  You either have to link against old/new libraries or you have to change the name that "time", for example, links to.  I think the _TIME_BITS stuff changes the definition of time so it links to another name.  (That's from a quick scan of the header files.  I'd have to look much harder if you want any details.)

> shmTime is simply using time_t, so it inherits the definition of time_t from
> the compilation environment.  POSIX says that <sys/time.h> is required to
> define time_t: 

If you #define _TIME_BITS 64 you get a different time_t.


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