[patch, fortran] PR34536 - add default warning

[Daniel Franke]

Hi all.

As suggested by Tobias in PR34536, this patch gives a warning by default for 
invalid code as "2.0**-3*5". If -std=f*, an error is emitted instead.


:ADDPATCH fortran:

gcc/fortran:
2007-12-21  Daniel Franke  <franke.daniel@gmail.com>

	* matchexp.c (match_ext_mult_operand): Print warning for unary 
	operators following arithmetic ones by default.
	(match_ext_add_operand): Likewise.

gcc/testsuite:
2007-12-21  Daniel Franke  <franke.daniel@gmail.com>

	* gfortran.dg/integer_exponentiation_2.f90: Fixed testcase.
	* gfortran.dg/real_const_3.f90: Likewise.


Regression tested on i686-pc-linux-gnu, no errors. Ok for trunk?

Regards
	Daniel
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