[PATCH] (request for comments) Wcoercion in g++

[Manuel López-Ibáñez]

The following patch replaces some of the functionality of Wconversion
in g++ by using the code developed for Wcoercion project. In
particular, it checks for coercions from real to integer.

The proposed implementation has two advantages over the existing one:

* The code is shared by both C and C++ front ends in the function
"coercion_warning" which is called through the existing function
"convert_and_check".

* The proposed implementation warns for int i = 1.1 but not for int i
= 1.0 while the previous code warns for both cases.

The patch must be applied after the ones given in
http://gcc.gnu.org/ml/gcc-patches/2006-07/msg00098.html

Bootstrapped and tested in trunk revision 115112

Comments and suggestions are very welcome.
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