AC_SYS_LARGEFILE

[Peter Simons]

Hi,

I recently added AC_SYS_LARGEFILE macro to my configure scripts, but I
encountered an interesting problem on Solaris 8: The configure script
adds the define "_FILE_OFFSET_BITS=64" to my CPPFLAGS, but once it
does, <unistd.h> and colleagues don't define open(2) anymore;
apparently, I have to use open64(2) instead.

Now I wonder: What is the best way to support this? Can't autoconf
somehow re-define the necessary routines transparently?

Another thing: I would be willing to have appropriate macros in my own
code, but how can I realiably determine, whether large-file support
has been enabled or not? Is there some define somewhere that tells me
whether I have large-file support or not? The symbol defined by
AC_SYS_LARGEFILE seems to vary from platform to platform ...

Any input is appreciated!

        -peter