id summary reporter owner description type status milestone component version severity resolution keywords cc 5075 boost/proto/fusion.hpp emits warnings with gcc -Wundef Markus Laker Eric Niebler "Using gcc -Wundef: In file included from /home/markusl/work/unicorn/1/libs/manspan/Ibspanfuncs.cpp:17: /home/markusl/work/unicorn/1/include/x86_64_bali/boost/proto/fusion.hpp:49:5: error: ""BOOST_MSVC"" is not defined /home/markusl/work/unicorn/1/include/x86_64_bali/boost/proto/fusion.hpp:725:5: error: ""BOOST_MSVC"" is not defined The attached patch solves the problem. " Bugs closed To Be Determined proto Boost 1.39.0 Problem fixed