Compiling DMD with C++11

[Andre Artus]

I decided to see whether dmd would compile with VS2013 and Clang. 
So far the only issue seems to be that C++11 RTL already defines 
'strtold'.

http://www.cplusplus.com/reference/cstdlib/strtold/

Compiling results in the following error:

Error	1	error C2556: 'longdouble strtold(const char *,char **)' : 
overloaded function differs only by return type from 'long double 
strtold(const char *,char 
**)'	d:\source\github\d\dmd\src\root\longdouble.h	201	1	dmd_msc

I have not used C++ in a very long time (cannot believe I used to 
love it, now it looks so ugly).

I can build against the VS2012 libraries, but that defeats the 
purpose of the exercise for me.

Is there a way to hide cstdlib/strtold?

I could refactor the code to rename dmd/strtold, but that may not 
go down well (play nice with others).

I also get the following warnings (when compiling in VS2012):

Warning	1	warning C4805: '!=' : unsafe mix of type 'char' and 
type 'bool' in 
operation	D:\source\GitHub\D\dmd\src\mars.c	1031	1	dmd_msc 
(Visual Studio 2012)

Warning	2	warning C4700: uninitialized local variable 'i' 
used	d:\source\github\d\dmd\src\backend\cgcod.c	2204	1	dmd_msc 
(Visual Studio 2012)

Warning	3	warning C4805: '==' : unsafe mix of type 'bool' and 
type 'int' in 
operation	D:\source\GitHub\D\dmd\src\backend\divcoeff.c	284	1	dmd_msc 
(Visual Studio 2012)

I tend to treat warnings as errors in my own code, which I 
relaxed here in order to get a working build.