Range-based for in c++98

[Magnus Fromreide]

Hello.

At the moment compilation of a range-based for in c++98 fails with the
error message:

foo.cpp: In function 'int foo()':
foo.cpp:4:13: error: expected initializer before ':' token
foo.cpp:6:1: error: expected primary-expression before '}' token
foo.cpp:6:1: error: expected ';' before '}' token
foo.cpp:6:1: error: expected primary-expression before '}' token
foo.cpp:6:1: error: expected ')' before '}' token
foo.cpp:6:1: error: expected primary-expression before '}' token
foo.cpp:6:1: error: expected ';' before '}' token

This is quite unreadable and not very informative.

In order to fix this I applied a patch that gives the output:

foo.cpp: In function 'int foo()':
foo.cpp:4:11: error: range-based for only available with -std=c++0x or -std=gnu++0x

but additionally it changes the output of g++.old-deja/g++.mike/for2.C
when compiled in c++98 mode.

Here there are two problems

#1 - It doesn't change the output of g++.old-deja/g++.mike/for2.C when
     compiled in c++0x-mode
#2 - It does change the output of g++.old-deja/g++.mike/for2.C when
     compiled in c++98-mode

#1 is a problem since for2.C only contains old-style for loops and so it
is ridiculous to say things like:

for2.C:4:16: error: types may not be defined in range-based for loops

and my patch extends that behavior to the c++98 case where it makes even
less sense...

Now, the good part is that solving problem #1 should solve problem #2 as
well.

(and yes, I know I shouldn't use error but I have yet to find the
location of the colon for error_at)

/MF
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