[Patch, fortran] PR 42434 Update documentation for SYSTEM_CLOCK

[Janne Blomqvist]

Hi,

the attached patch updates the documentation to match the
implementation of SYSTEM_CLOCK, where we now provide access to a
high-resolution monotonic clock via clock_gettime().

Tested with make pdf, Ok for trunk?

2011-02-05  Janne Blomqvist  <jb@gcc.gnu.org>

	PR fortran/42434
	* intrinsic.texi (SYSTEM_CLOCK): Update documentation.


-- 
Janne Blomqvist
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