[Committed] PR c++/19199: Preserve COND_EXPR lvalueness in fold

[Joseph S. Myers]

On Mon, 4 Apr 2005, Alexandre Oliva wrote:

> Err...  Why did you choose to drop the portion of the patch below,
> that would have avoided the ugliness of comparing langhooks.name, but
> still retained it in the ChangeLog entry?

pedantic_lvalues means "this is C, until I manage to disentangle enough 
C/C++/ObjC interactions to keep lvalueness internal to the C front end so 
pedantic_lvalues can go away".  Checking langhooks.name tests for C++, 
i.e. they differ in their effects for all languages other than C/ObjC/C++: 
only C/ObjC require that conditional expressions not be turned into 
lvalues if they weren't such to start with, while only C++ requires that 
conditional expressions which were lvalues be preserved in their original 
form.  The proper hook to check is one meaning "this is C++" rather than 
"this is not C", though perhaps adding a new hook 
"fold_preserve_cond_expr_p" would be cleaner than checking langhooks.name.

-- 
Joseph S. Myers               http://www.srcf.ucam.org/~jsm28/gcc/
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