Boost 1.53.0: libboost_graph_parallel.so fails to build in C++11 mode

[Arfrever.FTA@…]

libboost_graph_parallel.so in Boost 1.53.0 fails to build in C++11 mode. This bug does not occur in Boost 1.52.0. I use GCC 4.7.2.

gcc.compile.c++ bin.v2/libs/graph_parallel/build/gcc-4.7/gentoorelease/pch-off/threading-multi/mpi_process_group.o

    "x86_64-pc-linux-gnu-g++"  -ftemplate-depth-128 -march=core2 -O2 -pipe -std=gnu++11 -finline-functions -Wno-inline -Wall -pthread -fPIC  -DBOOST_ALL_NO_LIB=1 -DBOOST_GRAPH_DYN_LINK=1 -DBOOST_GRAPH_NO_LIB=1 -DNDEBUG  -I"." -I"libs/graph_parallel/src" -c -o "bin.v2/libs/graph_parallel/build/gcc-4.7/gentoorelease/pch-off/threading-multi/mpi_process_group.o" "libs/graph_parallel/src/mpi_process_group.cpp"

In file included from libs/graph_parallel/src/mpi_process_group.cpp:14:0:
./boost/graph/distributed/mpi_process_group.hpp: In member function ‘boost::graph::distributed::mpi_process_group::operator bool()’:
./boost/graph/distributed/mpi_process_group.hpp:419:28: error: cannot convert ‘boost::shared_ptr<boost::graph::distributed::mpi_process_group::impl>’ to ‘bool’ in return

[Jeremiah Willcock]

Does it still fail with the trunk version of Boost? I have seen errors like that from several other libraries that have since been resolved, and I believe the issue was not specific to Boost.Graph.

[Arfrever.FTA@…]

This bug still occurs in Boost trunk.

[Jeremiah Willcock]

(In [83799]) Added explicit conversion to make code with in C++11 mode; fixes #8411

[anonymous]

Please backport this change to release branch.

[Jeremiah Willcock]

I'll try to get it into the next release. Otherwise, you can download the trunk version or I can create a patch to use for now.

[Arfrever.FTA@…]

The patch works for me. It would be nice if applying additional patch was not needed in Boost 1.54.0.