Re: [eclipse-clp-users] C++ interface and GCC 4.x

Chris Mears wrote:
> Hello all,
> 
> The C++ interface doesn't work with recent versions of GCC using the
> default options.  For example, trying to compile the eg_cc_main.cc file
> (one of the examples included with Eclipse) results in the following
> errors:
> 
> $ g++-4.1 eg_cc_main.cc -I${ECLIPSEDIR}/include/${ARCH} -L${ECLIPSEDIR}/lib/${ARCH} -leclipse
> eg_cc_main.cc: In function ‘int main()’:
> eg_cc_main.cc:55: error: ‘newvar’ was not declared in this scope
> eg_cc_main.cc:59: error: ‘list’ was not declared in this scope
> eg_cc_main.cc:59: error: ‘list’ was not declared in this scope
> eg_cc_main.cc:59: error: declaration of ‘<typeprefixerror>list’
> eg_cc_main.cc:59: error: conflicts with previous declaration ‘<typeprefixerror>list’
> 
> The result is similar for g++-4.2 and g++-4.3.  The compilation succeeds
> with g++-3.3.
> 
> The problem is due to a change explained here:
> http://gcc.gnu.org/gcc-4.1/changes.html , as the first point in the C++
> section.  Specifically:
> 
>     ARM-style name-injection of friend declarations is no longer the
>     default. For example:
> 
>           struct S {
>             friend void f();
>           };
>           void g() { f(); }
> 
>     will not be accepted; instead a declaration of f will need to be
>     present outside of the scope of S. The new -ffriend-injection option
>     will enable the old behavior.
> 
> Indeed, using the -ffriend-injection option does make Eclipse's C++
> interface work properly.
> 
> The proper fix, I think, is to add declarations for functions like
> newvar, list etc. to Eclipse's C++ header file.  In the meantime, adding
> -ffriend-injection is a fine workaround.
> 
> 
> Chris Mears
> 
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Hi Chris,

Thanks for finding the problem and identifying the cause. I think this 
will allow us to fix the problem!

Cheers,

Kish


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