[ patch, committed] Warn about array temporary creation in front end optimization

[Thomas Koenig]

Hello world,

I have committed the attached patch as obvious, revision 171653, after 
regression-testing.

	Thomas

2011-03-29  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* frontend-passes.c (create_var):  Warn about creating an
	array temporary if requested.

2011-03-29  Thomas Koenig  <tkoenig@gcc.gnu.org>

         * gfortran.dg/function_optimize_1.f90:  Add -Warray-temporaries,
         check for corresponding warning.

2011-03-29  Thomas Koenig  <tkoenig@gcc.gnu.org>

         * frontend-passes.c (create_var):  Warn about creating an
         array temporary if requested.
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