The initial build issue [1] has been fixed upstream but the supertux
fail to link with boost libraries when using gcc 5 (which use C++11 by default):
libsupertux2_lib.a(main.cpp.o): In function `boost::system::error_category::std_category::equivalent(std::error_code const&, int) const':
main.cpp:(.text._ZNK5boost6system14error_category12std_category10equivalentERKSt10error_codei[_ZNK5boost6system14error_category12std_category10equivalentERKSt10error_codei]+0x32): undefined reference to `boost::system::detail::generic_category_instance'
main.cpp:(.text._ZNK5boost6system14error_category12std_category10equivalentERKSt10error_codei[_ZNK5boost6system14error_category12std_category10equivalentERKSt10error_codei]+0x47): undefined reference to `boost::system::detail::generic_category_instance'
main.cpp:(.text._ZNK5boost6system14error_category12std_category10equivalentERKSt10error_codei[_ZNK5boost6system14error_category12std_category10equivalentERKSt10error_codei]+0x99): undefined reference to `boost::system::detail::generic_category_instance'
libsupertux2_lib.a(main.cpp.o): In function `boost::system::error_category::std_category::equivalent(int, std::error_condition const&) const':
main.cpp:(.text._ZNK5boost6system14error_category12std_category10equivalentEiRKSt15error_condition[_ZNK5boost6system14error_category12std_category10equivalentEiRKSt15error_condition]+0x33): undefined reference to `boost::system::detail::generic_category_instance'
main.cpp:(.text._ZNK5boost6system14error_category12std_category10equivalentEiRKSt15error_condition[_ZNK5boost6system14error_category12std_category10equivalentEiRKSt15error_condition]+0x48): undefined reference to `boost::system::detail::generic_category_instance'
collect2: error: ld returned 1 exit status
This is a similar issue as the one reported by [2].
With gcc 5, boost libraries are compiled using C++11 but
supertux2_lib.a is using C++14 standard.
To fix the issue, boost libraries should be build using C++14
standard but we currently don't have an option to "force" the
default C++ standard used by the compiler.
So bump the minimum gcc version to gcc 6 since the C++14 is
used by default.
[1] https://github.com/SuperTux/supertux/issues/1014
[2] https://github.com/boostorg/system/issues/26
Fixes:
http://autobuild.buildroot.net/results/5b4/5b452c155917d783b3d8167fde48c2c938a74b95
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
e7386442c9