Re: PATCH RFA: Build stages 2 and 3 with C++

[Romain Geissler <romain.geissler@gmail.com>]

Hi

Le 16 juil. 2011 à 08:52, Ian Lance Taylor a écrit :

> I would like to propose this patch as a step toward building gcc using a
> C++ compiler.  This patch builds stage1 with the C compiler as usual,
> and defaults to building stages 2 and 3 with a C++ compiler built during
> stage 1.  This means that the gcc installed and used by most people will
> be built by a C++ compiler.  This will ensure that gcc is fully
> buildable with C++, while retaining the ability to bootstrap with only a
> C compiler, not a C++ compiler.  This will permit us to experiment with
> optionally using C++ for some code, using a #ifdef to select the C
> implementation or the C++ implementation.
> 
> I would suggest that we consider releasing 4.7 this way, as a small
> trial for building gcc with C++.
> 
> This is a big step, so I am sending the patch to both gcc@ and
> gcc-patches@ for comments.
> 
> Bootstrapped and ran testsuite on x86_64-unknown-linux-gnu.
> 
> Ian

This new build behavior broke former plugins built with gcc. Indeed,
all cc1 function symbols are now mangled and thus with the current
trunk, plugins should also look for mangled symbols (and so built
with g++).

What's the new GCC policy about that ? Do plugins have to be built
using g++ only, or does the plugin developer have the choice to
use both gcc and g++ according to it's need (at the cost of adding
extern "C" {…} in almost every headers to forbid mangling) ?

Romain Geissler