Have g++ define _FILE_OFFSET_BITS=64 on Solaris

[Rainer Orth]

Hi Franz,

> No idea about possible problems, but isn't it usually recommended to use
> either _FILE_OFFSET_BITS=64 or _LARGEFILE{64}_SOURCE=1, not both at the
> same time?

quite the contrary: for regular largefile support, you're supposed to
use `getconf LFS_CFLAGS', i.e. -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64, while `getconf LFS64_CFLAGS'
(-D_LARGEFILE64_SOURCE) enables the transitional largefile interfaces
(e.g. explicit stat64 calls and struct stat64 instead of making stat and
struct stat largefile-aware).

For all the gory details, see the lfcompile(7), lfcompile64(7), and
lf64(7) man pages:

	https://docs.oracle.com/cd/E88353_01/html/E37853/index.html

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University