CODEWITHSUNDEEP
c++boostc++11g++boost-program-options
lesenk
lesenk

Reputation: 805

Compilation fail in Boost librairies (program_options)

Today I rebuilt my C++ application and the compilation failed. Nothing has changed though. The first error was in my class List which inherits from std::vector (private inheritance) here:

template<typename T> void List<T>::append(const T& value)
{
    push_back(value);
}

I had to add std::vector<T>:: before push_back(value); because no declarations were found by the compiler. I don’t really know why it happens, but there was an update of g++, I now use g++ v4.7.0 (prerelease) using C++11 on Arch Linux.

I fixed that issue, but now, the real problem, is that I can’t compile the rest of the application because of a problem in the Boost library program_options. I include the library with:

#include <boost/config.hpp>
#include <boost/program_options/detail/config_file.hpp>
#include <boost/program_options/parsers.hpp>

The errors:

g++ -m64 -pipe -pedantic -Wextra -std=gnu++0x   -c -g -Wall -DDEBUG -DDEV -DMYSQL_SUPPORT -I. -IHeaders -MMD -MP -MF build/Debug/GNU-Linux-x86/Sources/Libs/Settings.o.d -o build/Debug/GNU-Linux-x86/Sources/Libs/Settings.o Sources/Libs/Settings.cpp
/usr/include/boost/program_options/detail/config_file.hpp: In instantiation of ‘bool boost::program_options::detail::basic_config_file_iterator<charT>::getline(std::string&) [with charT = char; std::string = std::basic_string<char>]’:
In file included from Sources/Libs/Settings.cpp:33:0:
Sources/Libs/Settings.cpp:69:24:   required from here
/usr/include/boost/program_options/detail/config_file.hpp:163:13: erreur: ‘to_internal’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]
In file included from /usr/include/boost/program_options/detail/parsers.hpp:9:0,
                 from /usr/include/boost/program_options/parsers.hpp:265,
                 from Sources/Libs/Settings.cpp:34:
/usr/include/boost/program_options/detail/convert.hpp:75:34: note: ‘template<class T> std::vector<std::basic_string<char> > boost::program_options::to_internal(const std::vector<T>&)’ declared here, later in the translation unit

The same errors than with my List class…

Thank you!

Upvotes: 3

Views: 1354

Answers (1)

mirk
mirk

Reputation: 5510

I suspect you have been bitten by changes in the two phase lookup rule for template instantiations in gcc 4.7.

I can't give any more practical advice without source code, but gcc4.7 changes (chapter C++) gives a description of two phase lookup and suggests some code corrections.

Upvotes: 3

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