[Patch, libfortran] Type cleanup

[Janne Blomqvist]

Hi,

the attached patch does a bit of janitorial type cleanup for the
library. It replaces the use of ssize_t with ptrdiff_t or index_type
where appropriate; this is entirely for documentation purposes, as on
all targets we support ssize_t == ptrdiff_t.

ssize_t is a POSIX type used in the IO functions, and refers to the
size of an object or -1 for an error (hence there is SSIZE_MAX but not
SSIZE_MIN).

ptrdiff_t is a C89 type which is the result of subtracting two
pointers; hence it's also the "natural" type for array indexes.

Regtested on x86_64-unknown-linux-gnu, Ok for trunk?

2011-04-12  Janne Blomqvist  <jb@gcc.gnu.org>

	* configure.ac: Use AC_TYPE_* to make sure we have (u)intptr_t,
	check for ptrdiff_t.
	* libgfortran.h: Remove (u)intptr_t definitions, use ptrdiff_t for
	index_type, change cshift0* prototypes.
	* config.h.in: Regenerated.
	* configure: Regenerated.
	* intrinsics/cshift0.c (cshift0): Use ptrdiff_t instead of ssize_t.
	* io/io.h (array_loop_spec): Use index_type instead of ssize_t.
	* io/list_read.c (nml_parse_qualifier): Likewise.
	* io/write.c (nml_write_obj): Likewise.
	* m4/cshift0.c (cshift0_'rtype_code`): Likewise.
	* generated/cshift0_*.c: Regenerated.


-- 
Janne Blomqvist
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