[boost] [proto]bug in g++4.1?:incomplete type within template(was Re: Preliminary submission: Boost.Proto DSEL Framework

From: Larry Evans (cppljevans_at_[hidden])
Date: 2007-04-17 13:19:48

On 04/04/2007 02:18 AM, Eric Niebler wrote:
> << Requirements >>
> 
> Tested with Boost RC 1.34 and HEAD.
> 
> Feedback is most welcome.
> 
> 
This just a headsup. With the attached, I get:

gcc.compile.c++ 
../../../../../../bin.v2/sandbox/lje/libs/xpressive/proto/example/gcc-4.1/debug/class_var_incomplete_test.o
../../../../../proto/boost/xpressive/proto/expr.hpp: In instantiation of 
'boost::proto::expr<boost::proto::tag::terminal, 
boost::proto::args1<inp<inp_0> >, 1l>':
class_var_incomplete_test.cpp:49:   instantiated from 'inp<inp_0>'
class_var_incomplete_test.cpp:63:   instantiated from here
../../../../../proto/boost/xpressive/proto/expr.hpp:105: error: 
'boost::proto::expr<Tag, Args, 1l>::arg0' has incomplete type
class_var_incomplete_test.cpp:39: error: declaration of 'struct inp<inp_0>'

     "/usr/bin/g++-4.1"  -ftemplate-depth-128 -O0 -fno-inline -Wall -g 
-fPIC  -DBOOST_ALL_NO_LIB=1  -I"../../../.." -I"../../../../../.." 
-I"../../../../../proto" -c -o 
"../../../../../../bin.v2/sandbox/lje/libs/xpressive/proto/example/gcc-4.1/debug/class_var_incomplete_test.o" 
"class_var_incomplete_test.cpp"

What's odd is if proto::terminal is *not* used, it compiles OK *or*
if non-nested inp_0_val is declared, it compiles OK.